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MOS6502 moved into src/chip/MOS6502 and broken into two different files. Tests have been flattened.

master
Bryan Miller 6 years ago
parent
fdee76c879
commit
3daef52868
8 changed files with 1217 additions and 1219 deletions
Split View Show Diff Stats
  1. +1
    -1
      dummy.js
  2. +0
    -739
      src/MOS6502.js
  3. +678
    -0
      src/chip/MOS6502/assembler.js
  4. +59
    -0
      src/chip/MOS6502/cpu.js
  5. +5
    -0
      src/chip/MOS6502/index.js
  6. +0
    -478
      test/MOS6502.spec.js
  7. +473
    -0
      test/unit.src.chip.MOS6502.assembler.spec.js
  8. +1
    -1
      test/unit.src.utils.bitman.spec.js

+ 1
- 1
dummy.js View File

@@ -1,4 +1,4 @@
var mos6502 = require("./src/MOS6502.js");
var mos6502 = require("./src/chip/MOS6502");

var asm = new mos6502.Assembler();
var src = "DEFINE TOPNT $44\n";

+ 0
- 739
src/MOS6502.js View File

@@ -1,739 +0,0 @@
/*
* Emulate a basic 6502 (MOS) chip.
*/

var Memory = require('./memory.js');

class CPU{
constructor(){
// Registers
this.__PC = 0; // Program Counter (16 bit)
this.__IRQ = 0; // IRQ interrupt address code (16 bit)
this.__SR = 0; // Status Register (8 bit)
this.__XR = 0; // X Register (8 bit)
this.__YR = 0; // Y Register (8 bit)
this.__AR = 0; // Accumulator Register (8 bit)

// Variables to watch for Interrupts.
this.__nmi = false;
this.__irq = false;

// Memory module or controller.
this.__mem = null; // Must be explicitly attached.

// Hold any created CLK instances.
this.__clkfn = null;
}

set NMI(n){
this.__nmi = (n === true);
}

set IRQ(q){
// TODO: Verify this.
// TODO: Do not set if the interrupt flag is off.
this.__irq = (q === true);
}

reset(){
// TODO: Read memory address $FFFC - FFFD to find PC start location.
// TODO: Reset status registers that get changed on a reset.
}

clk(){
if (this.__clkfn === null){
this.__clkfn = (function(){
// TODO: All the work!!
}).bind(this);
}
return this.__clkfn;
}

memory(mem){
if (!(mem instanceof Memory))
throw new ValueError("Expected Memory instance object.");
this.__mem = mem;
}
}



// ---------------------------------------------------------------------
// ---------------------------------------------------------------------

function toHexString(v, l){
l = (typeof(l) === 'number' && (l === 8 || l === 16)) ? l : 8;
var r = v.toString(16);
if (r.length < 2)
r = "0" + r;
if (l === 16 && r.length < 4)
r = ((r.length === 2) ? "00" : "0") + r;
return r;
}

function tokenize(l){
var m = l.match(/([^()]+)|([()])/g);
var ip = false;
var t = [];
m.forEach((mi)=>{
if (mi === "("){
ip = true;
} else if (mi === ")"){
ip = false;
} else {
if (ip){
mi.split(/[\s,]+/).forEach((i)=>{
if (i !== "")
t.push("+" + i);
});
} else {
mi.split(/[\s,]+/).forEach((i)=>{
if (i !== "")
t.push(i);
});
}
}
});
return t;
}

class Assembler{
constructor(initpc){
// Labels that hold variable values.
this.__varlabels = {};
// Labels that hold jump/branch locations.
this.__jmplabels = {};
// Inital value for program counter. Used by the reset() method.
this.__initPC = (typeof(initpc) === 'number' && initpc >= 0) ? initpc : 0;
// Program counter to track where in the code/memory a
// operation is located.
this.__PC = this.__initPC;
this.__result = [];
}

get PC(){return this.__PC;}
get variables(){
var v = {};
Object.keys(this.__varlabels).forEach((lbl)=>{
if (this.__varlabels.hasOwnProperty(lbl))
v[lbl] = this.__varlabels[lbl];
});
return v;
}
get jumplabels(){
var j = {};
Object.keys(this.__jmplabels).forEach((lbl)=>{
if (this.__jmplabels.hasOwnProperty(lbl))
j[lbl] = this.__jmplabels[lbl];
});
return j;
}



__StoreVarLabel(lbl, val){
if (lbl in this.__varlabels)
throw new Error("Variable label '" + lbl + "' defined more than once.");
if (lbl in this.__jmplabels)
throw new Error("Variable label '" + lbl + "' matches already existing jump label.");
let v = Number.NaN;
if (val[0] === "$"){
if (val.length >= 2 && val.length <= 5)
v = parseInt(val.substr(1), 16);
} else if (val[0] === "#"){
if (val.startsWith("#b")){
v = parseInt(val.substr(2), 2);
} else {
v = parseInt(val);
}
}
if (!isNaN(v)){
if (v < 0 || v > 65535)
throw new Error("Variable '" + lbl + "' value is out of bounds for this processor.");
this.__varlabels[lbl] = v;
} else {
throw new Error("Variable '" + lbl + "' value malformed.");
}
}

__StoreJmpLabel(lbl){
if (lbl in this.__jmplabels)
throw new Error("Jump label '" + lbl + "' defined more than once at program address " + toHexString(this.__PC));
if (lbl in this.__varlabels)
throw new Error("Jump label '" + lbl + "' matches already existing variable name at program address " + toHexString(this.__PC));
this.__jmplabels[lbl] = this.__PC;
}

__AddrModeVal(tA, tB){
var mode = "";
var v = Number.NaN;
if (tA[0] === '#'){
mode = "i"; // Immediate
if (tA[1] === '$'){
v = parseInt(tA.substr(2), 16);
} else if (tA[1] === 'b'){
v = parseInt(tA.substr(2), 2);
} else {
v = parseInt(tA.substr(1));
if (isNaN(v)){
let lbl = tA.substr(1);
if (lbl in this.__varlabels){
if (this.__varlabels[lbl] < 256)
v = this.__varlabels[lbl]
}
}
}
} else if (tA[0] === '$'){
v = parseInt(tA.substr(1), 16);
if (tA.length === 3){
// Zero Page
if (tB !== null){
if (tB === "X")
mode = "zX";
if (tB === "Y")
mode = "zY";
} else {
mode = "z";
}
} else if (tA.length === 5){
// Absolute
if (tB !== null){
if (tB === "X"){
mode = "aX";
} else if (tB === "Y"){
mode = "aY";
}
} else {
mode = "a";
}
}
} else if (tA.startsWith("+")){
if (tB !== null){
if (tB === "+X"){ // The plus exists due to how tokenize() works.
mode = "nX";
} else if (tB === "Y"){
mode = "nY";
}

if (mode !== ""){
if (tA.startsWith("+$")){
v = parseInt(tA.substr(2), 16);
} else {
let lbl = tA.substr(1);
if (lbl in this.__varlabels){
if (this.__varlabels[lbl] < 256)
v = this.__varlabels[lbl];
}
}
}
}
} else {
// We've been given a variable name. Need to look it up.
// if the var is 1 byte, assume "Zero Page". If var 2 bytes, assume "Absolute"
if (tA in this.__varlabel){
v = this.__varlabel[tA];
if (v < 256){
if (tB !== null){
if (tB === "X")
mode = "zX";
} else {
mode = "z";
}
} else {
if (tB !== null){
if (tB === "X"){
mode = "aX";
} else if (tB === "Y"){
mode = "aY";
}
} else {
mode = "a";
}
}
}
}

if (mode !== "" && ! isNaN(v))
return [mode, v];
throw new Error("Malformed op-code or value on program address " + toHexString(this.__PC));
}




compile(src){
var op = [];
src.split("\n").forEach((line)=>{
line = line.trim();
if (line === ""){return this;}
if (line[0] !== ";"){ // Skip comment lines.
line = line.split(";")[0].trim(); // Take out any trailing comments.
// Checking for any jump labels!
if (line.indexOf(":") >= 0){
let s = line.split(":");
let lbl = s[0].trim();
if (lbl.length <= 0)
throw new Error("Malformatted jump label at program address " + toHexString(this.__PC));
this.__StoreJmpLabel(lbl);
line = s[1].trim();
if (line.length <= 0){return this;} // Nothing left to process.
}
// Finally... tokenize the main command.
var tokens = tokenize(line);

if (tokens[0].toLowerCase() === '.define'){
// Variable label!!
this.__StoreVarLabel(tokens[1], tokens[2]);
/*} else if (tokens[0][tokens[0].length - 1] === ':'){
// Jump labels!
this.__StoreJmpLabel(tokens[0].substr(0, tokens[0].length - 1));*/
} else if (tokens[0].toLowerCase() === '.bytes'){
// Compiler directive. Treat all proceeding tokens as values and store them raw.
for(let i=1; i < tokens.length; i++){
let v = Number.NaN;
if (tokens[i].startsWith("$")){
v = parseInt(tokens[i].substr(1), 16);
} else if (tokens[i].startsWith("b")){
v = parseInt(tokens[i].substr(1), 2);
} else {
v = parseInt(tokens[i]);
}
if (isNaN(v) || v < 0 || v >= 256)
throw new Error("Byte list value is malformed or out of bounds at program address " + toHexString(this.__PC));
op.push(v);
this.__PC += 1;
};
} else if (tokens[0].length === 3){

let StoreSingleOp = (code)=>{
if (tokens.length === 1){
op.push(code);
this.__PC += 1;
return false;
}
return true;
};

let StoreBranchOp = (code) => {
if (tokens.length === 2){
let v = Number.NaN;
if (tokens[1][0] === '$'){
if (tokens[1].length === 3 || tokens[1].length === 5){
v = parseInt(token[1].substr(1), 16);
}
} else {
if (tokens[1] in this.__jmplabels){
v = this.__jmplabels[tokens[1]];
}
}

if (!isNaN(v)){
if (v < (this.__PC+1) - 127 || v > (this.__PC+1) + 128)
throw new Error("Branch exceeds maximum number of bytes on program address " + toHexString(this.__PC + 1));
v = v - (this.__PC + 1);
op.push(code);
op.push((v >= 0) ? v : v + 255);
this.__PC += 2;
return false;
}
}
return true;
};

let StoreOp = (codes, mint, maxt, zpm) => {
zpm = (zpm === "zY") ? "zY" : "zX";
if (tokens.length >= mint && tokens.length <= maxt){
let mv = this.__AddrModeVal(tokens[1], (tokens.length === 3) ? tokens[2].toUpperCase() : null);
let modena = true;
switch(mv[0]){
case "i":
modena = codes[0] === null;
if (!modena){
op.push(codes[0]);
op.push(mv[1]);
this.__PC += 2;
} break;
case "z":
modena = codes[1] === null;
if (!modena){
op.push(codes[1]);
op.push(mv[1]);
this.__PC += 2;
} break;
case "zY":
case "zX":
modena = (mv[0] === zpm && codes[2] === null);
if (!modena){
op.push(codes[2]);
op.push(mv[1]);
this.__PC += 2;
} break;
case "a":
modena = codes[3] === null;
if (!modena){
op.push(codes[3]);
op.push(mv[1] & 0x000000FF);
op.push((mv[1] & 0x0000FF00) >> 8);
this.__PC += 3;
} break;
case "aX":
modena = codes[4] === null;
if (!modena){
op.push(codes[4]);
op.push(mv[1] & 0x000000FF);
op.push((mv[1] & 0x0000FF00) >> 8);
this.__PC += 3;
} break;
case "aY":
modena = codes[5] === null;
if (!modena){
op.push(codes[5]);
op.push(mv[1] & 0x000000FF);
op.push((mv[1] & 0x0000FF00) >> 8);
this.__PC += 3;
} break;
case "nX":
modena = codes[6] === null;
if (!modena){
op.push(codes[6]);
op.push(mv[1]);
this.__PC += 2;
} break;
case "nY":
modena = codes[7] === null;
if (!modena){
op.push(codes[7]);
op.push(mv[1]);
this.__PC += 2;
} break;
}
if (modena)
throw new Error("Op-code does not support implied mode on program address " + toHexString(this.__PC));
return false;
}
return true;
};

let procFailed = false;
let mv = null;
// Possible op code.
switch(tokens[0].toLowerCase()){
// --- ADC
case 'adc':
procFailed = StoreOp([0x69, 0x65, 0x75, 0x6D, 0x7D, 0x79, 0x61, 0x71], 2, 3);
/*
if (tokens.length >= 2 && tokens.length <= 3){
mv = addrModeVal(tokens[1], (tokens.length === 3) ? tokens[2].toUpperCase(), null);
this.__PC += 2;
switch(mv[0]){
case "i":
op.push(0x69);
op.push(mv[1]);
break;
case "z":
case "zX":
op.push((mv[0] === "z") ? 0x65 : 0x75);
op.push(mv[1]);
break;
case "a":
case "aX":
case "aY":
op.push((mv[0] === "a") ? 0x6D : ((mv[0] === "aX") ? 0x7D : 0x79));
op.push(mv[1] & 0x000000FF);
op.push((mv[1] & 0x0000FF00) >> 8);
this.__PC += 1;
break;
case "nX":
case "nY":
op.push((mv[0] === "nX") ? 0x61 : 0x71);
op.push(mv[1]);
break;
}
} else { procFailed = true; }
*/
break;
// --- AND
case 'and':
procFailed = StoreOp([0x29, 0x25, 0x35, 0x2D, 0x3D, 0x39, 0x21, 0x31], 2, 3);
break;
// --- ASL
case 'asl':
if (tokens.length === 2){
if (tokens[1].toUpperCase() === 'A'){
op.push(0x0A);
this.__PC += 1;
break;
}
}
procFailed = StoreOp([null, 0x06, 0x16, 0x0E, 0x1E, null, null, null], 2, 3);
break;
// --- BCC
case 'bcc':
procFailed = StoreBranchOp(0x90); break;
// --- BCS
case 'bcs':
procFailed = StoreBranchOp(0xB0); break;
// --- BEQ
case 'beq':
procFailed = StoreBranchOp(0xF0); break;
// --- BIT
case 'bit':
procFailed = StoreOp([null, 0x24, null, 0x2C, null, null, null, null], 2, 2); break;
// --- BMI
case 'bmi':
procFailed = StoreBranchOp(0x30); break;
// --- BNE
case 'bne':
procFailed = StoreBranchOp(0xD0); break;
// --- BPL
case 'bpl':
procFailed = StoreBranchOp(0x10); break;
// --- BRK
case 'brk':
procFailed = StoreSingleOp(0x00); break;
// --- BVC
case 'bvc':
procFailed = StoreBranchOp(0x50); break;
// --- BVS
case 'bvs':
procFailed = StoreBranchOp(0x70); break;
// --- CLC
case 'clc':
procFailed = StoreSingleOp(0x18); break;
// --- CLD
case 'cld':
procFailed = StoreSingleOp(0xD8); break;
// --- CLI
case 'cli':
procFailed = StoreSingleOp(0x58); break;
// --- CLV
case 'clv':
procFailed = StoreSingleOp(0xB8); break;
// --- CMP
case 'cmp':
procFailed = StoreOp([0xC9, 0xC5, 0xD5, 0xCD, 0xDD, 0xD9, 0xC1, 0xD1], 2, 3); break;
// --- CPX
case 'cpx':
procFailed = StoreOp([0xE0, 0xE4, null, 0xEC, null, null, null, null], 2, 2); break;
// --- CPY
case 'cpy':
procFailed = StoreOp([0xC0, 0xC4, null, 0xCC, null, null, null, null], 2, 2); break;
// --- DEC
case 'dec':
procFailed = StoreOp([null, 0xC6, 0xD6, 0xCE, 0xDE, null, null, null], 2, 3); break;
// --- DEX
case 'dex':
procFailed = StoreSingleOp(0xCA); break;
// --- DEY
case 'dey':
procFailed = StoreSingleOp(0x88); break;
// --- EOR
case 'eor':
procFailed = StoreOp([0x49, 0x45, 0x55, 0x4D, 0x5D, 0x59, 0x41, 0x51], 2, 3); break;
// --- INC
case 'inc':
procFailed = StoreOp([null, 0xE6, 0xF6, 0xEE, 0xFE, null, null, null], 2, 3); break;
// --- INX
case 'inx':
procFailed = StoreSingleOp(0xE8); break;
// --- INY
case 'iny':
procFailed = StoreSingleOp(0xC8); break;
// --- JMP
case 'jmp':
if (tokens.length === 2){
let v = Number.NaN;
let code = (tokens[1].startsWith("+")) ? 0x6C : 0x4C;
if (tokens[1].startsWith("$")){
if (tokens[1].length === 5)
v = parseInt(tokens[1].substr(1), 16);
} else if (tokens[1].startsWith("+$")){
if (tokens[1].length === 6)
v = parseInt(tokens[1].substr(2), 16);
} else {
let lbl = (tokens[1].startsWith("+")) ? tokens[1].substr(1) : tokens[1];
if (lbl in this.__jmplabels)
v = this.__jmplabels[lbl];
}
if (!isNaN(v)){
op.push(code);
op.push(v & 0x000000FF);
op.push((v & 0x0000FF00) >> 8);
this.__PC += 3;
} else {
throw new Error("Malformed op-code or value on program address " + toHexString(this.__PC));
}
} else { procFailed = true; }
break;
// --- JSR
case 'jsr':
if (tokens.length === 2){
let v = Number.NaN;
if (tokens[1].startsWith("$")){
if (tokens[1].length === 5)
v = parseInt(tokens[1].substr(1), 16);
} else {
if (tokens[1] in this.__jmplabels)
v = this.__jmplabels[tokens[1]];
}
if (!isNaN(v)){
op.push(0x20);
op.push(v & 0x000000FF);
op.push((v & 0x0000FF00) >> 8);
this.__PC += 3;
} else {
throw new Error("Malformed op-code or value on program address " + toHexString(this.__PC));
}
} else {
procFailed = true;
}
break;
// --- LDA
case 'lda':
procFailed = StoreOp([0xA9, 0xA5, 0xB5, 0xAD, 0xBD, 0xB9, 0xA1, 0xB1], 2, 3); break;
// --- LDX
case 'ldx':
procFailed = StoreOp([0xA2, 0xA6, 0xB6, 0xAE, 0xBE, null, null, null], 2, 3, "zY"); break;
// --- LDY
case 'ldy':
procFailed = StoreOp([0xA0, 0xA4, 0xB4, 0xAC, 0xBC, null, null, null], 2, 3); break;
// --- LSR
case 'lsr':
if (tokens.length === 2){
if (tokens[1].toUpperCase() === 'A'){
op.push(0x4A);
this.__PC += 1;
break;
}
}
procFailed = StoreOp([null, 0x46, 0x56, 0x4E, 0x5E, null, null, null], 2, 3); break;
// --- NOP
case 'nop':
procFailed = StoreSingleOp(0xEA); break;
// --- ORA
case 'ora':
procFailed = StoreOp([0x09, 0x05, 0x15, 0x0D, 0x1D, 0x19, 0x01, 0x11], 2, 3); break;
// --- PHA
case 'pha':
procFailed = StoreSingleOp(0x48); break;
// --- PHP
case 'php':
procFailed = StoreSingleOp(0x08); break;
// --- PLA
case 'pla':
procFailed = StoreSingleOp(0x68); break;
// --- PLP
case 'plp':
procFailed = StoreSingleOp(0x28); break;
// --- ROL
case 'rol':
if (tokens.length === 2){
if (tokens[1].toUpperCase() === 'A'){
op.push(0x2A);
this.__PC += 1;
break;
}
}
procFailed = StoreOp([null, 0x26, 0x36, 0x2E, 0x3E, null, null, null], 2, 3); break;
// --- ROR
case 'ror':
if (tokens.length === 2){
if (tokens[1].toUpperCase() === 'A'){
op.push(0x6A);
this.__PC += 1;
break;
}
}
procFailed = StoreOp([null, 0x66, 0x76, 0x6E, 0x7E, null, null, null], 2, 3); break;
// --- RTI
case 'rti':
procFailed = StoreSingleOp(0x40); break;
// --- RTS
case 'rts':
procFailed = StoreSingleOp(0x60); break;
break;
// --- SBC
case 'sbc':
procFailed = StoreOp([0xE9, 0xE5, 0xF5, 0xED, 0xFD, 0xF9, 0xE1, 0xF1], 2, 3); break;
// --- SEC
case 'sec':
procFailed = StoreSingleOp(0x38); break;
// --- SED
case 'sed':
procFailed = StoreSingleOp(0xF8); break;
// --- SEI
case 'sei':
procFailed = StoreSingleOp(0x78); break;
break;
// --- STA
case 'sta':
procFailed = StoreOp([null, 0x85, 0x95, 0x8D, 0x9D, 0x99, 0x81, 0x91], 2, 3); break;
// --- STX
case 'stx':
procFailed = StoreOp([null, 0x86, 0x96, 0x8E, null, null, null, null], 2, 3, "zY"); break;
// --- STY
case 'sty':
procFailed = StoreOp([null, 0x84, 0x94, 0x8C, null, null, null, null], 2, 3); break;
// --- TAX
case 'tax':
procFailed = StoreSingleOp(0xAA); break;
// --- TAY
case 'tay':
procFailed = StoreSingleOp(0xA8); break;
// --- TSX
case 'tsx':
procFailed = StoreSingleOp(0xBA); break;
// --- TXA
case 'txa':
procFailed = StoreSingleOp(0x8A); break;
// --- TXS
case 'txs':
procFailed = StoreSingleOp(0x9A); break;
// --- TYA
case 'tya':
procFailed = StoreSingleOp(0x98); break;
// --- ---
// EOL
// --- ---
default:
throw new Error("Unknown op-code '" + tokens[0].toUpperCase() + "' at program address " + toHexString(this.__PC));
}

if (procFailed)
throw new Error("Malformed op-code on program address " + toHexString(this.__PC));
} else {
throw new Error("Failed to compile line '" + line + "' at program address " + toHexString(this.__PC));
}
}
});
this.__result = this.__result.concat(op);
return this;
//return new Uint8Array(op);
}

result(){
return new Uint8Array(this.__result);
}

reset(){
this.__PC = this.__initPC;
this.__varlabels = {};
this.__jmplabels = {};
this.__result = [];
return this;
}
}



// ---------------------------------------------------------------------
// ---------------------------------------------------------------------

module.exports = {
CPU: CPU,
Assembler: Assembler
};





+ 678
- 0
src/chip/MOS6502/assembler.js View File

@@ -0,0 +1,678 @@
function ToHexString(v, l){
l = (typeof(l) === 'number' && (l === 8 || l === 16)) ? l : 8;
var r = v.toString(16);
if (r.length < 2)
r = "0" + r;
if (l === 16 && r.length < 4)
r = ((r.length === 2) ? "00" : "0") + r;
return r;
}

function Tokenize(l){
var m = l.match(/([^()]+)|([()])/g);
var ip = false;
var t = [];
m.forEach((mi)=>{
if (mi === "("){
ip = true;
} else if (mi === ")"){
ip = false;
} else {
if (ip){
mi.split(/[\s,]+/).forEach((i)=>{
if (i !== "")
t.push("+" + i);
});
} else {
mi.split(/[\s,]+/).forEach((i)=>{
if (i !== "")
t.push(i);
});
}
}
});
return t;
}



function StoreVarLabel(data, lbl, val){
if (lbl in data.varlabels)
throw new Error("Variable label '" + lbl + "' defined more than once.");
if (lbl in data.jmplabels)
throw new Error("Variable label '" + lbl + "' matches already existing jump label.");
let v = Number.NaN;
if (val[0] === "$"){
if (val.length >= 2 && val.length <= 5)
v = parseInt(val.substr(1), 16);
} else if (val[0] === "#"){
if (val.startsWith("#b")){
v = parseInt(val.substr(2), 2);
} else {
v = parseInt(val);
}
}
if (!isNaN(v)){
if (v < 0 || v > 65535)
throw new Error("Variable '" + lbl + "' value is out of bounds for this processor.");
data.varlabels[lbl] = v;
} else {
throw new Error("Variable '" + lbl + "' value malformed.");
}
}

function StoreJmpLabel(data, lbl){
if (lbl in data.jmplabels)
throw new Error("Jump label '" + lbl + "' defined more than once at program address " + ToHexString(data.PC));
if (lbl in data.varlabels)
throw new Error("Jump label '" + lbl + "' matches already existing variable name at program address " + ToHexString(data.PC));
data.jmplabels[lbl] = data.PC;
}



function AddrModeVal(data, tA, tB){
var mode = "";
var v = Number.NaN;
if (tA[0] === '#'){
mode = "i"; // Immediate
if (tA[1] === '$'){
v = parseInt(tA.substr(2), 16);
} else if (tA[1] === 'b'){
v = parseInt(tA.substr(2), 2);
} else {
v = parseInt(tA.substr(1));
if (isNaN(v)){
let lbl = tA.substr(1);
if (lbl in this.__varlabels){
if (this.__varlabels[lbl] < 256)
v = this.__varlabels[lbl]
}
}
}
} else if (tA[0] === '$'){
v = parseInt(tA.substr(1), 16);
if (tA.length === 3){
// Zero Page
if (tB !== null){
if (tB === "X")
mode = "zX";
if (tB === "Y")
mode = "zY";
} else {
mode = "z";
}
} else if (tA.length === 5){
// Absolute
if (tB !== null){
if (tB === "X"){
mode = "aX";
} else if (tB === "Y"){
mode = "aY";
}
} else {
mode = "a";
}
}
} else if (tA.startsWith("+")){
if (tB !== null){
if (tB === "+X"){ // The plus exists due to how tokenize() works.
mode = "nX";
} else if (tB === "Y"){
mode = "nY";
}

if (mode !== ""){
if (tA.startsWith("+$")){
v = parseInt(tA.substr(2), 16);
} else {
let lbl = tA.substr(1);
if (lbl in this.__varlabels){
if (this.__varlabels[lbl] < 256)
v = this.__varlabels[lbl];
}
}
}
}
} else {
// We've been given a variable name. Need to look it up.
// if the var is 1 byte, assume "Zero Page". If var 2 bytes, assume "Absolute"
if (tA in data.varlabel){
v = data.varlabel[tA];
if (v < 256){
if (tB !== null){
if (tB === "X")
mode = "zX";
} else {
mode = "z";
}
} else {
if (tB !== null){
if (tB === "X"){
mode = "aX";
} else if (tB === "Y"){
mode = "aY";
}
} else {
mode = "a";
}
}
}
}

if (mode !== "" && ! isNaN(v))
return [mode, v];
throw new Error("Malformed op-code or value on program address " + ToHexString(data.PC));
}


// --------------------------------------------------------------------------------------------
// --------------------------------------------------------------------------------------------

function StoreSingleOp(data, cmp, code){
if (cmp.tokens.length === 1){
cmp.op.push(code);
data.PC += 1;
return false;
}
return true;
};

function StoreBranchOp(data, cmp, code){
if (cmp.tokens.length === 2){
let v = Number.NaN;
if (cmp.tokens[1][0] === '$'){
if (cmp.tokens[1].length === 3 || cmp.tokens[1].length === 5){
v = parseInt(cmp.token[1].substr(1), 16);
}
} else {
if (cmp.tokens[1] in data.jmplabels){
v = data.jmplabels[cmp.tokens[1]];
}
}

if (!isNaN(v)){
if (v < (data.PC+1) - 127 || v > (data.PC+1) + 128)
throw new Error("Branch exceeds maximum number of bytes on program address " + ToHexString(data.PC + 1));
v = v - (data.PC + 1);
cmp.op.push(code);
cmp.op.push((v >= 0) ? v : v + 255);
data.PC += 2;
return false;
}
}
return true;
};

function StoreOp(data, cmp, codes, mint, maxt, zpm){
let tokens = cmp.tokens;
zpm = (zpm === "zY") ? "zY" : "zX";
if (cmp.tokens.length >= mint && cmp.tokens.length <= maxt){
let mv = AddrModeVal(data, cmp.tokens[1], (cmp.tokens.length === 3) ? cmp.tokens[2].toUpperCase() : null);
let modena = true;
switch(mv[0]){
case "i":
modena = codes[0] === null;
if (!modena){
cmp.op.push(codes[0]);
cmp.op.push(mv[1]);
data.PC += 2;
} break;
case "z":
modena = codes[1] === null;
if (!modena){
cmp.op.push(codes[1]);
cmp.op.push(mv[1]);
data.PC += 2;
} break;
case "zY":
case "zX":
modena = (mv[0] === zpm && codes[2] === null);
if (!modena){
cmp.op.push(codes[2]);
cmp.op.push(mv[1]);
data.PC += 2;
} break;
case "a":
modena = codes[3] === null;
if (!modena){
cmp.op.push(codes[3]);
cmp.op.push(mv[1] & 0x000000FF);
cmp.op.push((mv[1] & 0x0000FF00) >> 8);
data.PC += 3;
} break;
case "aX":
modena = codes[4] === null;
if (!modena){
cmp.op.push(codes[4]);
cmp.op.push(mv[1] & 0x000000FF);
cmp.op.push((mv[1] & 0x0000FF00) >> 8);
data.PC += 3;
} break;
case "aY":
modena = codes[5] === null;
if (!modena){
cmp.op.push(codes[5]);
cmp.op.push(mv[1] & 0x000000FF);
cmp.op.push((mv[1] & 0x0000FF00) >> 8);
data.PC += 3;
} break;
case "nX":
modena = codes[6] === null;
if (!modena){
cmp.op.push(codes[6]);
cmp.op.push(mv[1]);
data.PC += 2;
} break;
case "nY":
modena = codes[7] === null;
if (!modena){
cmp.op.push(codes[7]);
cmp.op.push(mv[1]);
data.PC += 2;
} break;
}
if (modena)
throw new Error("Op-code does not support implied mode on program address " + ToHexString(data.PC));
return false;
}
return true;
};



// --------------------------------------------------------------------------------------------
// --------------------------------------------------------------------------------------------


class Assembler{
constructor(initpc){
// Inital value for program counter. Used by the reset() method.
this.__initPC = (typeof(initpc) === 'number' && initpc >= 0) ? initpc : 0;
this.__data = {
// Labels that hold variable values.
varlabels: {},
// Labels that hold jump/branch locations.
jmplabels: {},
// Program counter to track where in the code/memory a
// operation is located.
PC: this.__initPC,
// Currently compiled code.
result: []
};
}

get PC(){return this.__data.PC;}
get variables(){
var v = {};
Object.keys(this.__data.varlabels).forEach((lbl)=>{
if (this.__data.varlabels.hasOwnProperty(lbl))
v[lbl] = this.__data.varlabels[lbl];
});
return v;
}
get jumplabels(){
var j = {};
Object.keys(this.__data.jmplabels).forEach((lbl)=>{
if (this.__data.jmplabels.hasOwnProperty(lbl))
j[lbl] = this.__data.jmplabels[lbl];
});
return j;
}


compile(src){
var cmp = {
op: [],
tokens: []
};
src.split("\n").forEach((line)=>{
line = line.trim();
if (line === ""){return this;}
if (line[0] !== ";"){ // Skip comment lines.
line = line.split(";")[0].trim(); // Take out any trailing comments.
// Checking for any jump labels!
if (line.indexOf(":") >= 0){
let s = line.split(":");
let lbl = s[0].trim();
if (lbl.length <= 0)
throw new Error("Malformatted jump label at program address " + toHexString(this.__PC));
StoreJmpLabel(this.__data, lbl);
line = s[1].trim();
if (line.length <= 0){return this;} // Nothing left to process.
}
// Finally... tokenize the main command.
cmp.tokens = Tokenize(line);

if (cmp.tokens[0].toLowerCase() === '.define'){
// Variable label!!
StoreVarLabel(this.__data, cmp.tokens[1], cmp.tokens[2]);
} else if (cmp.tokens[0].toLowerCase() === '.bytes'){
// Compiler directive. Treat all proceeding tokens as values and store them raw.
for(let i=1; i < cmp.tokens.length; i++){
let v = Number.NaN;
if (cmp.tokens[i].startsWith("$")){
v = parseInt(cmp.tokens[i].substr(1), 16);
} else if (cmp.tokens[i].startsWith("b")){
v = parseInt(cmp.tokens[i].substr(1), 2);
} else {
v = parseInt(cmp.tokens[i]);
}
if (isNaN(v) || v < 0 || v >= 256)
throw new Error("Byte list value is malformed or out of bounds at program address " + toHexString(this.__PC));
cmp.op.push(v);
this.__data.PC += 1;
};
} else if (cmp.tokens[0].length === 3){
let procFailed = false;
let mv = null;
// Possible op code.
switch(cmp.tokens[0].toLowerCase()){
// --- ADC
case 'adc':
procFailed = StoreOp(this.__data, cmp, [0x69, 0x65, 0x75, 0x6D, 0x7D, 0x79, 0x61, 0x71], 2, 3);
/*
if (tokens.length >= 2 && tokens.length <= 3){
mv = addrModeVal(tokens[1], (tokens.length === 3) ? tokens[2].toUpperCase(), null);
this.__PC += 2;
switch(mv[0]){
case "i":
op.push(0x69);
op.push(mv[1]);
break;
case "z":
case "zX":
op.push((mv[0] === "z") ? 0x65 : 0x75);
op.push(mv[1]);
break;
case "a":
case "aX":
case "aY":
op.push((mv[0] === "a") ? 0x6D : ((mv[0] === "aX") ? 0x7D : 0x79));
op.push(mv[1] & 0x000000FF);
op.push((mv[1] & 0x0000FF00) >> 8);
this.__PC += 1;
break;
case "nX":
case "nY":
op.push((mv[0] === "nX") ? 0x61 : 0x71);
op.push(mv[1]);
break;
}
} else { procFailed = true; }
*/
break;
// --- AND
case 'and':
procFailed = StoreOp(this.__data, cmp, [0x29, 0x25, 0x35, 0x2D, 0x3D, 0x39, 0x21, 0x31], 2, 3);
break;
// --- ASL
case 'asl':
if (cmp.tokens.length === 2){
if (cmp.tokens[1].toUpperCase() === 'A'){
cmp.op.push(0x0A);
this.__data.PC += 1;
break;
}
}
procFailed = StoreOp(this.__data, cmp, [null, 0x06, 0x16, 0x0E, 0x1E, null, null, null], 2, 3);
break;
// --- BCC
case 'bcc':
procFailed = StoreBranchOp(this.__data, cmp, 0x90); break;
// --- BCS
case 'bcs':
procFailed = StoreBranchOp(this.__data, cmp, 0xB0); break;
// --- BEQ
case 'beq':
procFailed = StoreBranchOp(this.__data, cmp, 0xF0); break;
// --- BIT
case 'bit':
procFailed = StoreOp(this.__data, cmp, [null, 0x24, null, 0x2C, null, null, null, null], 2, 2); break;
// --- BMI
case 'bmi':
procFailed = StoreBranchOp(this.__data, cmp, 0x30); break;
// --- BNE
case 'bne':
procFailed = StoreBranchOp(this.__data, cmp, 0xD0); break;
// --- BPL
case 'bpl':
procFailed = StoreBranchOp(this.__data, cmp, 0x10); break;
// --- BRK
case 'brk':
procFailed = StoreSingleOp(this.__data, cmp, 0x00); break;
// --- BVC
case 'bvc':
procFailed = StoreBranchOp(this.__data, cmp, 0x50); break;
// --- BVS
case 'bvs':
procFailed = StoreBranchOp(this.__data, cmp, 0x70); break;
// --- CLC
case 'clc':
procFailed = StoreSingleOp(this.__data, cmp, 0x18); break;
// --- CLD
case 'cld':
procFailed = StoreSingleOp(this.__data, cmp, 0xD8); break;
// --- CLI
case 'cli':
procFailed = StoreSingleOp(this.__data, cmp, 0x58); break;
// --- CLV
case 'clv':
procFailed = StoreSingleOp(this.__data, cmp, 0xB8); break;
// --- CMP
case 'cmp':
procFailed = StoreOp(this.__data, cmp, [0xC9, 0xC5, 0xD5, 0xCD, 0xDD, 0xD9, 0xC1, 0xD1], 2, 3); break;
// --- CPX
case 'cpx':
procFailed = StoreOp(this.__data, cmp, [0xE0, 0xE4, null, 0xEC, null, null, null, null], 2, 2); break;
// --- CPY
case 'cpy':
procFailed = StoreOp(this.__data, cmp, [0xC0, 0xC4, null, 0xCC, null, null, null, null], 2, 2); break;
// --- DEC
case 'dec':
procFailed = StoreOp(this.__data, cmp, [null, 0xC6, 0xD6, 0xCE, 0xDE, null, null, null], 2, 3); break;
// --- DEX
case 'dex':
procFailed = StoreSingleOp(this.__data, cmp, 0xCA); break;
// --- DEY
case 'dey':
procFailed = StoreSingleOp(this.__data, cmp, 0x88); break;
// --- EOR
case 'eor':
procFailed = StoreOp(this.__data, cmp, [0x49, 0x45, 0x55, 0x4D, 0x5D, 0x59, 0x41, 0x51], 2, 3); break;
// --- INC
case 'inc':
procFailed = StoreOp(this.__data, cmp, [null, 0xE6, 0xF6, 0xEE, 0xFE, null, null, null], 2, 3); break;
// --- INX
case 'inx':
procFailed = StoreSingleOp(this.__data, cmp, 0xE8); break;
// --- INY
case 'iny':
procFailed = StoreSingleOp(this.__data, cmp, 0xC8); break;
// --- JMP
case 'jmp':
if (cmp.tokens.length === 2){
let v = Number.NaN;
let code = (cmp.tokens[1].startsWith("+")) ? 0x6C : 0x4C;
if (cmp.tokens[1].startsWith("$")){
if (cmp.tokens[1].length === 5)
v = parseInt(cmp.tokens[1].substr(1), 16);
} else if (cmp.tokens[1].startsWith("+$")){
if (cmp.tokens[1].length === 6)
v = parseInt(cmp.tokens[1].substr(2), 16);
} else {
let lbl = (cmp.tokens[1].startsWith("+")) ? cmp.tokens[1].substr(1) : cmp.tokens[1];
if (lbl in this.__data.jmplabels)
v = this.__data.jmplabels[lbl];
}
if (!isNaN(v)){
cmp.op.push(code);
cmp.op.push(v & 0x000000FF);
cmp.op.push((v & 0x0000FF00) >> 8);
this.__data.PC += 3;
} else {
throw new Error("Malformed op-code or value on program address " + ToHexString(this.__data.PC));
}
} else { procFailed = true; }
break;
// --- JSR
case 'jsr':
if (cmp.tokens.length === 2){
let v = Number.NaN;
if (cmp.tokens[1].startsWith("$")){
if (cmp.tokens[1].length === 5)
v = parseInt(cmp.tokens[1].substr(1), 16);
} else {
if (cmp.tokens[1] in this.__data.jmplabels)
v = this.__data.jmplabels[cmp.tokens[1]];
}
if (!isNaN(v)){
cmp.op.push(0x20);
cmp.op.push(v & 0x000000FF);
cmp.op.push((v & 0x0000FF00) >> 8);
this.__data.PC += 3;
} else {
throw new Error("Malformed op-code or value on program address " + ToHexString(this.__data.PC));
}
} else {
procFailed = true;
}
break;
// --- LDA
case 'lda':
procFailed = StoreOp(this.__data, cmp, [0xA9, 0xA5, 0xB5, 0xAD, 0xBD, 0xB9, 0xA1, 0xB1], 2, 3); break;
// --- LDX
case 'ldx':
procFailed = StoreOp(this.__data, cmp, [0xA2, 0xA6, 0xB6, 0xAE, 0xBE, null, null, null], 2, 3, "zY"); break;
// --- LDY
case 'ldy':
procFailed = StoreOp(this.__data, cmp, [0xA0, 0xA4, 0xB4, 0xAC, 0xBC, null, null, null], 2, 3); break;
// --- LSR
case 'lsr':
if (cmp.tokens.length === 2){
if (cmp.tokens[1].toUpperCase() === 'A'){
cmp.op.push(0x4A);
this.__data.PC += 1;
break;
}
}
procFailed = StoreOp(this.__data, cmp, [null, 0x46, 0x56, 0x4E, 0x5E, null, null, null], 2, 3); break;
// --- NOP
case 'nop':
procFailed = StoreSingleOp(this.__data, cmp, 0xEA); break;
// --- ORA
case 'ora':
procFailed = StoreOp(this.__data, cmp, [0x09, 0x05, 0x15, 0x0D, 0x1D, 0x19, 0x01, 0x11], 2, 3); break;
// --- PHA
case 'pha':
procFailed = StoreSingleOp(this.__data, cmp, 0x48); break;
// --- PHP
case 'php':
procFailed = StoreSingleOp(this.__data, cmp, 0x08); break;
// --- PLA
case 'pla':
procFailed = StoreSingleOp(this.__data, cmp, 0x68); break;
// --- PLP
case 'plp':
procFailed = StoreSingleOp(this.__data, cmp, 0x28); break;
// --- ROL
case 'rol':
if (cmp.tokens.length === 2){
if (cmp.tokens[1].toUpperCase() === 'A'){
cmp.op.push(0x2A);
this.__data.PC += 1;
break;
}
}
procFailed = StoreOp(this.__data, cmp, [null, 0x26, 0x36, 0x2E, 0x3E, null, null, null], 2, 3); break;
// --- ROR
case 'ror':
if (cmp.tokens.length === 2){
if (cmp.tokens[1].toUpperCase() === 'A'){
cmp.op.push(0x6A);
this.__data.PC += 1;
break;
}
}
procFailed = StoreOp(this.__data, cmp, [null, 0x66, 0x76, 0x6E, 0x7E, null, null, null], 2, 3); break;
// --- RTI
case 'rti':
procFailed = StoreSingleOp(this.__data, cmp, 0x40); break;
// --- RTS
case 'rts':
procFailed = StoreSingleOp(this.__data, cmp, 0x60); break;
break;
// --- SBC
case 'sbc':
procFailed = StoreOp(this.__data, cmp, [0xE9, 0xE5, 0xF5, 0xED, 0xFD, 0xF9, 0xE1, 0xF1], 2, 3); break;
// --- SEC
case 'sec':
procFailed = StoreSingleOp(this.__data, cmp, 0x38); break;
// --- SED
case 'sed':
procFailed = StoreSingleOp(this.__data, cmp, 0xF8); break;
// --- SEI
case 'sei':
procFailed = StoreSingleOp(this.__data, cmp, 0x78); break;
break;
// --- STA
case 'sta':
procFailed = StoreOp(this.__data, cmp, [null, 0x85, 0x95, 0x8D, 0x9D, 0x99, 0x81, 0x91], 2, 3); break;
// --- STX
case 'stx':
procFailed = StoreOp(this.__data, cmp, [null, 0x86, 0x96, 0x8E, null, null, null, null], 2, 3, "zY"); break;
// --- STY
case 'sty':
procFailed = StoreOp(this.__data, cmp, [null, 0x84, 0x94, 0x8C, null, null, null, null], 2, 3); break;
// --- TAX
case 'tax':
procFailed = StoreSingleOp(this.__data, cmp, 0xAA); break;
// --- TAY
case 'tay':
procFailed = StoreSingleOp(this.__data, cmp, 0xA8); break;
// --- TSX
case 'tsx':
procFailed = StoreSingleOp(this.__data, cmp, 0xBA); break;
// --- TXA
case 'txa':
procFailed = StoreSingleOp(this.__data, cmp, 0x8A); break;
// --- TXS
case 'txs':
procFailed = StoreSingleOp(this.__data, cmp, 0x9A); break;
// --- TYA
case 'tya':
procFailed = StoreSingleOp(this.__data, cmp, 0x98); break;
// --- ---
// EOL
// --- ---
default:
throw new Error("Unknown op-code '" + cmp.tokens[0].toUpperCase() + "' at program address " + ToHexString(this.__data.PC));
}

if (procFailed)
throw new Error("Malformed op-code on program address " + ToHexString(this.__data.PC));
} else {
throw new Error("Failed to compile line '" + line + "' at program address " + ToHexString(this.__data.PC));
}
}
});
this.__data.result = this.__data.result.concat(cmp.op);
return this;
//return new Uint8Array(op);
}

result(){
return new Uint8Array(this.__data.result);
}

reset(){
this.__data.varlabels = {};
this.__data.jmplabels = {};
this.__data.PC = this.__initPC;
this.__data.result = [];
return this;
}
}


module.exports = Assembler;

+ 59
- 0
src/chip/MOS6502/cpu.js View File

@@ -0,0 +1,59 @@
/*
* Emulate a basic 6502 (MOS) chip.
*/

var Memory = require('../../common/memory.js');

class CPU{
constructor(){
// Registers
this.__PC = 0; // Program Counter (16 bit)
this.__IRQ = 0; // IRQ interrupt address code (16 bit)
this.__SR = 0; // Status Register (8 bit)
this.__XR = 0; // X Register (8 bit)
this.__YR = 0; // Y Register (8 bit)
this.__AR = 0; // Accumulator Register (8 bit)

// Variables to watch for Interrupts.
this.__nmi = false;
this.__irq = false;

// Memory module or controller.
this.__mem = null; // Must be explicitly attached.

// Hold any created CLK instances.
this.__clkfn = null;
}

set NMI(n){
this.__nmi = (n === true);
}

set IRQ(q){
// TODO: Verify this.
// TODO: Do not set if the interrupt flag is off.
this.__irq = (q === true);
}

reset(){
// TODO: Read memory address $FFFC - FFFD to find PC start location.
// TODO: Reset status registers that get changed on a reset.
}

clk(){
if (this.__clkfn === null){
this.__clkfn = (function(){
// TODO: All the work!!
}).bind(this);
}
return this.__clkfn;
}

memory(mem){
if (!(mem instanceof Memory))
throw new ValueError("Expected Memory instance object.");
this.__mem = mem;
}
}

module.exports = CPU;

+ 5
- 0
src/chip/MOS6502/index.js View File

@@ -0,0 +1,5 @@

module.exports = {
CPU: require('./cpu.js'),
Assembler: require('./assembler.js')
};

+ 0
- 478
test/MOS6502.spec.js View File

@@ -1,478 +0,0 @@
const expect = require('chai').expect;
const mos6502 = require('../src/MOS6502.js');


describe("Testing MOS6502 Systems...", function(){
describe("Testing MOS6502 Assembler...", function(){
var asm = new mos6502.Assembler();

it(".reset()", function(){
asm.compile("ADC $44");
asm.reset();
expect(asm.PC).to.equal(0);
expect(Object.keys(asm.variables).length).to.equal(0);
expect(Object.keys(asm.jumplabels).length).to.equal(0);
expect(asm.result().length).to.equal(0);
});

it(".result()", function(){
asm.reset();
asm.compile("ADC $44");
expect(asm.result().length).to.be.gt(0);
});

describe(".compile()", function(){
it(".define directive", function(){
asm.compile(".define TAG $44");
let vars = asm.variables;
expect(vars).to.have.key('TAG');
expect(vars['TAG']).to.equal(0x44);
});

it("Jump labels", function(){
let pc = asm.PC;
asm.compile("loop:\nBNE loop");
let jmp = asm.jumplabels;
expect(jmp).to.have.key('loop');
expect(jmp['loop']).to.equal(pc);
});

it(".bytes directive", function(){
let res = asm.reset().compile(".BYTES $44, $55, $66, $77, b10110101, 128").result();
expect(res.length).to.equal(6);
expect(res[0]).to.equal(0x44);
expect(res[1]).to.equal(0x55);
expect(res[2]).to.equal(0x66);
expect(res[3]).to.equal(0x77);
expect(res[4]).to.equal(parseInt('10110101', 2));
expect(res[5]).to.equal(128);
});

it("Jump label before and after .byte directive", function(){
asm.reset();
let pc1 = asm.PC;
asm.compile("bytes: .bytes $44, $55, $66, $77");
let pc2 = asm.PC;
asm.compile("loop: BNE loop");

let jmp = asm.jumplabels;
//expect(jmp).to.have.key('bytes');
expect(jmp['bytes']).to.equal(pc1);
//expect(jmp).to.have.key('loop');
expect(jmp['loop']).to.equal(pc2);

let res = asm.result();
expect(res.length).to.equal(6);
expect(res[0]).to.equal(0x44);
expect(res[1]).to.equal(0x55);
expect(res[2]).to.equal(0x66);
expect(res[3]).to.equal(0x77);
expect(res[4]).to.equal(0xD0);
expect(res[5]).to.equal(0xFE);
});

it("ADC Immediate", function(){
asm.reset();
asm.compile("ADC #$44");
let res = asm.result();
expect(res.length).to.equal(2);
expect(res[0]).to.equal(0x69);
expect(res[1]).to.equal(0x44);
});

it("ADC Zero Page", function(){
asm.reset();
asm.compile("ADC $44");
let res = asm.result();
expect(res.length).to.equal(2);
expect(res[0]).to.equal(0x65);
expect(res[1]).to.equal(0x44);
});

it("ADC Zero Page, X", function(){
asm.reset();
asm.compile("ADC $44, X");
let res = asm.result();
expect(res.length).to.equal(2);
expect(res[0]).to.equal(0x75);
expect(res[1]).to.equal(0x44);
});

it("ADC Absolute", function(){
asm.reset();
asm.compile("ADC $4400");
let res = asm.result();
expect(res.length).to.equal(3);
expect(res[0]).to.equal(0x6D);
expect(res[1]).to.equal(0x00);
expect(res[2]).to.equal(0x44);
});

it("ADC Absolute, X", function(){
asm.reset();
asm.compile("ADC $4400,X");
let res = asm.result();
expect(res.length).to.equal(3);
expect(res[0]).to.equal(0x7D);
expect(res[1]).to.equal(0x00);
expect(res[2]).to.equal(0x44);
});

it("ADC Absolute, Y", function(){
asm.reset();
asm.compile("ADC $4400, Y");
let res = asm.result();
expect(res.length).to.equal(3);
expect(res[0]).to.equal(0x79);
expect(res[1]).to.equal(0x00);
expect(res[2]).to.equal(0x44);
});

it("ADC Indirect, X", function(){
asm.reset();
asm.compile("ADC ($44,X)");
let res = asm.result();
expect(res.length).to.equal(2);
expect(res[0]).to.equal(0x61);
expect(res[1]).to.equal(0x44);
});

it("ADC Indirect, Y", function(){
asm.reset();
asm.compile("ADC ($44), Y");
let res = asm.result();
expect(res.length).to.equal(2);
expect(res[0]).to.equal(0x71);
expect(res[1]).to.equal(0x44);
});
// -------------------------------------------------------------
it("AND Immediate");
it("AND Zero Page");
it("AND Zero Page, X");
it("AND Absolute");
it("AND Absolute, X");
it("AND Absolute, Y");
it("AND Indirect, X");
it("AND Indirect, Y");
// -------------------------------------------------------------
it("ASL Accumulator");
it("ASL Zero Page");
it("ASL Zero Page, X");
it("ASL Absolute");
it("ASL Absolute, X");
// -------------------------------------------------------------
it("BIT Zero Page");
it("BIT Absolute");
// -------------------------------------------------------------
it("BPL");
it("BMI");
it("BVC");
it("BVS");
it("BCC");
it("BCS");
it("BNE");
it("BEQ");
// -------------------------------------------------------------
it ("BRK", function(){
asm.reset();
let res = asm.compile("BRK").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x00);
});
// -------------------------------------------------------------
it("CMP Immediate");
it("CMP Zero Page");
it("CMP Zero Page, X");
it("CMP Absolute");
it("CMP Absolute, X");
it("CMP Absolute, Y");
it("CMP Indirect, X");
it("CMP Indirect, Y");
// -------------------------------------------------------------
it("CPX Immediate");
it("CPX Zero Page");
it("CPX Absolute");
// -------------------------------------------------------------
it("CPY Immediate");
it("CPY Zero Page");
it("CPY Absolute");
// -------------------------------------------------------------
it("DEC Zero Page");
it("DEC Zero Page, X");
it("DEC Absolute");
it("DEC Absolute, X");

// -------------------------------------------------------------
it("EOR Immediate");
it("EOR Zero Page");
it("EOR Zero Page, X");
it("EOR Absolute");
it("EOR Absolute, X");
it("EOR Absolute, Y");
it("EOR Indirect, X");
it("EOR Indirect, Y");

// -------------------------------------------------------------
it("CLC", function(){
asm.reset();
let res = asm.compile("CLC").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x18);
});

it("CLD", function(){
asm.reset();
let res = asm.compile("CLD").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0xD8);
});

it("CLI", function(){
asm.reset();
let res = asm.compile("CLI").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x58);
});

it("CLV", function(){
asm.reset();
let res = asm.compile("CLV").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0xB8);
});

it("SEC", function(){
asm.reset();
let res = asm.compile("SEC").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x38);
});

it("SED", function(){
asm.reset();
let res = asm.compile("SED").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0xF8);
});

it("SEI", function(){
asm.reset();
let res = asm.compile("SEI").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x78);
});

// -------------------------------------------------------------
it("INC Zero Page");
it("INC Zero Page, X");
it("INC Absolute");
it("INC Absolute, X");
// -------------------------------------------------------------
it("JMP Absolute");
it("JMP Indirect");
// -------------------------------------------------------------
it("JRS Absolute");
// -------------------------------------------------------------
it("LDA Immediate");
it("LDA Zero Page");
it("LDA Zero Page, X");
it("LDA Absolute");
it("LDA Absolute, X");
it("LDA Absolute, Y");
it("LDA Indirect, X");
it("LDA Indirect, Y");
// -------------------------------------------------------------
it("LDX Immediate");
it("LDX Zero Page");
it("LDX Zero Page, Y");
it("LDX Absolute");
it("LDX Absolute, Y");
// -------------------------------------------------------------
it("LDY Immediate");
it("LDY Zero Page");
it("LDY Zero Page, X");
it("LDY Absolute");
it("LDY Absolute, X");
// -------------------------------------------------------------
it("LSR Accumulator");
it("LSR Zero Page");
it("LSR Zero Page, X");
it("LSR Absolute");
it("LSR Absolute, X");
// -------------------------------------------------------------
it("NOP", function(){
asm.reset();
let res = asm.compile("NOP").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0xEA);
});

// -------------------------------------------------------------
it("ORA Immediate");
it("ORA Zero Page");
it("ORA Zero Page, X");
it("ORA Absolute");
it("ORA Absolute, X");
it("ORA Absolute, Y");
it("ORA Indirect, X");
it("ORA Indirect, Y");
// -------------------------------------------------------------
it("DEX", function(){
asm.reset();
let res = asm.compile("DEX").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0xCA);
});

it("DEY", function(){
asm.reset();
let res = asm.compile("DEY").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x88);
});

it("INX", function(){
asm.reset();
let res = asm.compile("INX").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0xE8);
});

it("INY", function(){
asm.reset();
let res = asm.compile("INY").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0xC8);
});

it("TAX", function(){
asm.reset();
let res = asm.compile("TAX").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0xAA);
});

it("TAY", function(){
asm.reset();
let res = asm.compile("TAY").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0xA8);
});

it("TXA", function(){
asm.reset();
let res = asm.compile("TXA").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x8A);
});

it("TYA", function(){
asm.reset();
let res = asm.compile("TYA").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x98);
});

// -------------------------------------------------------------
it("ROL Accumulator");
it("ROL Zero Page");
it("ROL Zero Page, X");
it("ROL Absolute");
it("ROL Absolute, X");
// -------------------------------------------------------------
it("ROR Accumulator");
it("ROR Zero Page");
it("ROR Zero Page, X");
it("ROR Absolute");
it("ROR Absolute, X");
// -------------------------------------------------------------
it("RTI", function(){
asm.reset();
let res = asm.compile("RTI").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x40);
});
it("RTS", function(){
asm.reset();
let res = asm.compile("RTS").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x60);
});

// -------------------------------------------------------------
it("SBC Immediate");
it("SBC Zero Page");
it("SBC Zero Page, X");
it("SBC Absolute");
it("SBC Absolute, X");
it("SBC Absolute, Y");
it("SBC Indirect, X");
it("SBC Indirect, Y");
// -------------------------------------------------------------
it("STA Zero Page");
it("STA Zero Page, X");
it("STA Absolute");
it("STA Absolute, X");
it("STA Absolute, Y");
it("STA Indirect, X");
it("STA Indirect, Y");
// -------------------------------------------------------------
it("PHA", function(){
asm.reset();
let res = asm.compile("PHA").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x48);
});

it("PHP", function(){
asm.reset();
let res = asm.compile("PHP").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x08);
});

it("PLA", function(){
asm.reset();
let res = asm.compile("PLA").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x68);
});

it("PLP", function(){
asm.reset();
let res = asm.compile("PLP").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x28);
});

it("TSX", function(){
asm.reset();
let res = asm.compile("TSX").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0xBA);
});

it("TXS", function(){
asm.reset();
let res = asm.compile("TXS").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x9A);
});

// -------------------------------------------------------------
it("STX Zero Page");
it("STX Zero Page, Y");
it("STX Absolute");
// -------------------------------------------------------------
it("STY Zero Page");
it("STY Zero Page, X");
it("STY Absolute");

// -------------------------------------------------------------
});
});

describe("Testing MOS6502 CPU...", function(){
it("Something here...");
});
});

+ 473
- 0
test/unit.src.chip.MOS6502.assembler.spec.js View File

@@ -0,0 +1,473 @@
const expect = require('chai').expect;
const Assembler = require('../src/chip/MOS6502/assembler.js');


describe("Testing MOS6502 Assembler...", function(){
var asm = new Assembler();

it(".reset()", function(){
asm.compile("ADC $44");
asm.reset();
expect(asm.PC).to.equal(0);
expect(Object.keys(asm.variables).length).to.equal(0);
expect(Object.keys(asm.jumplabels).length).to.equal(0);
expect(asm.result().length).to.equal(0);
});

it(".result()", function(){
asm.reset();
asm.compile("ADC $44");
expect(asm.result().length).to.be.gt(0);
});

describe(".compile()", function(){
it(".define directive", function(){
asm.compile(".define TAG $44");
let vars = asm.variables;
expect(vars).to.have.key('TAG');
expect(vars['TAG']).to.equal(0x44);
});

it("Jump labels", function(){
let pc = asm.PC;
asm.compile("loop:\nBNE loop");
let jmp = asm.jumplabels;
expect(jmp).to.have.key('loop');
expect(jmp['loop']).to.equal(pc);
});

it(".bytes directive", function(){
let res = asm.reset().compile(".BYTES $44, $55, $66, $77, b10110101, 128").result();
expect(res.length).to.equal(6);
expect(res[0]).to.equal(0x44);
expect(res[1]).to.equal(0x55);
expect(res[2]).to.equal(0x66);
expect(res[3]).to.equal(0x77);
expect(res[4]).to.equal(parseInt('10110101', 2));
expect(res[5]).to.equal(128);
});

it("Jump label before and after .byte directive", function(){
asm.reset();
let pc1 = asm.PC;
asm.compile("bytes: .bytes $44, $55, $66, $77");
let pc2 = asm.PC;
asm.compile("loop: BNE loop");

let jmp = asm.jumplabels;
//expect(jmp).to.have.key('bytes');
expect(jmp['bytes']).to.equal(pc1);
//expect(jmp).to.have.key('loop');
expect(jmp['loop']).to.equal(pc2);

let res = asm.result();
expect(res.length).to.equal(6);
expect(res[0]).to.equal(0x44);
expect(res[1]).to.equal(0x55);
expect(res[2]).to.equal(0x66);
expect(res[3]).to.equal(0x77);
expect(res[4]).to.equal(0xD0);
expect(res[5]).to.equal(0xFE);
});

it("ADC Immediate", function(){
asm.reset();
asm.compile("ADC #$44");
let res = asm.result();
expect(res.length).to.equal(2);
expect(res[0]).to.equal(0x69);
expect(res[1]).to.equal(0x44);
});

it("ADC Zero Page", function(){
asm.reset();
asm.compile("ADC $44");
let res = asm.result();
expect(res.length).to.equal(2);
expect(res[0]).to.equal(0x65);
expect(res[1]).to.equal(0x44);
});

it("ADC Zero Page, X", function(){
asm.reset();
asm.compile("ADC $44, X");
let res = asm.result();
expect(res.length).to.equal(2);
expect(res[0]).to.equal(0x75);
expect(res[1]).to.equal(0x44);
});

it("ADC Absolute", function(){
asm.reset();
asm.compile("ADC $4400");
let res = asm.result();
expect(res.length).to.equal(3);
expect(res[0]).to.equal(0x6D);
expect(res[1]).to.equal(0x00);
expect(res[2]).to.equal(0x44);
});

it("ADC Absolute, X", function(){
asm.reset();
asm.compile("ADC $4400,X");
let res = asm.result();
expect(res.length).to.equal(3);
expect(res[0]).to.equal(0x7D);
expect(res[1]).to.equal(0x00);
expect(res[2]).to.equal(0x44);
});

it("ADC Absolute, Y", function(){
asm.reset();
asm.compile("ADC $4400, Y");
let res = asm.result();
expect(res.length).to.equal(3);
expect(res[0]).to.equal(0x79);
expect(res[1]).to.equal(0x00);
expect(res[2]).to.equal(0x44);
});

it("ADC Indirect, X", function(){
asm.reset();
asm.compile("ADC ($44,X)");
let res = asm.result();
expect(res.length).to.equal(2);
expect(res[0]).to.equal(0x61);
expect(res[1]).to.equal(0x44);
});

it("ADC Indirect, Y", function(){
asm.reset();
asm.compile("ADC ($44), Y");
let res = asm.result();
expect(res.length).to.equal(2);
expect(res[0]).to.equal(0x71);
expect(res[1]).to.equal(0x44);
});
// -------------------------------------------------------------
it("AND Immediate");
it("AND Zero Page");
it("AND Zero Page, X");
it("AND Absolute");
it("AND Absolute, X");
it("AND Absolute, Y");
it("AND Indirect, X");
it("AND Indirect, Y");
// -------------------------------------------------------------
it("ASL Accumulator");
it("ASL Zero Page");
it("ASL Zero Page, X");
it("ASL Absolute");
it("ASL Absolute, X");
// -------------------------------------------------------------
it("BIT Zero Page");
it("BIT Absolute");
// -------------------------------------------------------------
it("BPL");
it("BMI");
it("BVC");
it("BVS");
it("BCC");
it("BCS");
it("BNE");
it("BEQ");
// -------------------------------------------------------------
it ("BRK", function(){
asm.reset();
let res = asm.compile("BRK").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x00);
});
// -------------------------------------------------------------
it("CMP Immediate");
it("CMP Zero Page");
it("CMP Zero Page, X");
it("CMP Absolute");
it("CMP Absolute, X");
it("CMP Absolute, Y");
it("CMP Indirect, X");
it("CMP Indirect, Y");
// -------------------------------------------------------------
it("CPX Immediate");
it("CPX Zero Page");
it("CPX Absolute");
// -------------------------------------------------------------
it("CPY Immediate");
it("CPY Zero Page");
it("CPY Absolute");
// -------------------------------------------------------------
it("DEC Zero Page");
it("DEC Zero Page, X");
it("DEC Absolute");
it("DEC Absolute, X");

// -------------------------------------------------------------
it("EOR Immediate");
it("EOR Zero Page");
it("EOR Zero Page, X");
it("EOR Absolute");
it("EOR Absolute, X");
it("EOR Absolute, Y");
it("EOR Indirect, X");
it("EOR Indirect, Y");

// -------------------------------------------------------------
it("CLC", function(){
asm.reset();
let res = asm.compile("CLC").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x18);
});

it("CLD", function(){
asm.reset();
let res = asm.compile("CLD").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0xD8);
});

it("CLI", function(){
asm.reset();
let res = asm.compile("CLI").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x58);
});

it("CLV", function(){
asm.reset();
let res = asm.compile("CLV").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0xB8);
});

it("SEC", function(){
asm.reset();
let res = asm.compile("SEC").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x38);
});

it("SED", function(){
asm.reset();
let res = asm.compile("SED").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0xF8);
});

it("SEI", function(){
asm.reset();
let res = asm.compile("SEI").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x78);
});

// -------------------------------------------------------------
it("INC Zero Page");
it("INC Zero Page, X");
it("INC Absolute");
it("INC Absolute, X");
// -------------------------------------------------------------
it("JMP Absolute");
it("JMP Indirect");
// -------------------------------------------------------------
it("JRS Absolute");
// -------------------------------------------------------------
it("LDA Immediate");
it("LDA Zero Page");
it("LDA Zero Page, X");
it("LDA Absolute");
it("LDA Absolute, X");
it("LDA Absolute, Y");
it("LDA Indirect, X");
it("LDA Indirect, Y");
// -------------------------------------------------------------
it("LDX Immediate");
it("LDX Zero Page");
it("LDX Zero Page, Y");
it("LDX Absolute");
it("LDX Absolute, Y");
// -------------------------------------------------------------
it("LDY Immediate");
it("LDY Zero Page");
it("LDY Zero Page, X");
it("LDY Absolute");
it("LDY Absolute, X");
// -------------------------------------------------------------
it("LSR Accumulator");
it("LSR Zero Page");
it("LSR Zero Page, X");
it("LSR Absolute");
it("LSR Absolute, X");
// -------------------------------------------------------------
it("NOP", function(){
asm.reset();
let res = asm.compile("NOP").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0xEA);
});

// -------------------------------------------------------------
it("ORA Immediate");
it("ORA Zero Page");
it("ORA Zero Page, X");
it("ORA Absolute");
it("ORA Absolute, X");
it("ORA Absolute, Y");
it("ORA Indirect, X");
it("ORA Indirect, Y");
// -------------------------------------------------------------
it("DEX", function(){
asm.reset();
let res = asm.compile("DEX").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0xCA);
});

it("DEY", function(){
asm.reset();
let res = asm.compile("DEY").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x88);
});

it("INX", function(){
asm.reset();
let res = asm.compile("INX").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0xE8);
});

it("INY", function(){
asm.reset();
let res = asm.compile("INY").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0xC8);
});

it("TAX", function(){
asm.reset();
let res = asm.compile("TAX").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0xAA);
});

it("TAY", function(){
asm.reset();
let res = asm.compile("TAY").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0xA8);
});

it("TXA", function(){
asm.reset();
let res = asm.compile("TXA").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x8A);
});

it("TYA", function(){
asm.reset();
let res = asm.compile("TYA").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x98);
});

// -------------------------------------------------------------
it("ROL Accumulator");
it("ROL Zero Page");
it("ROL Zero Page, X");
it("ROL Absolute");
it("ROL Absolute, X");
// -------------------------------------------------------------
it("ROR Accumulator");
it("ROR Zero Page");
it("ROR Zero Page, X");
it("ROR Absolute");
it("ROR Absolute, X");
// -------------------------------------------------------------
it("RTI", function(){
asm.reset();
let res = asm.compile("RTI").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x40);
});
it("RTS", function(){
asm.reset();
let res = asm.compile("RTS").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x60);
});

// -------------------------------------------------------------
it("SBC Immediate");
it("SBC Zero Page");
it("SBC Zero Page, X");
it("SBC Absolute");
it("SBC Absolute, X");
it("SBC Absolute, Y");
it("SBC Indirect, X");
it("SBC Indirect, Y");
// -------------------------------------------------------------
it("STA Zero Page");
it("STA Zero Page, X");
it("STA Absolute");
it("STA Absolute, X");
it("STA Absolute, Y");
it("STA Indirect, X");
it("STA Indirect, Y");
// -------------------------------------------------------------
it("PHA", function(){
asm.reset();
let res = asm.compile("PHA").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x48);
});

it("PHP", function(){
asm.reset();
let res = asm.compile("PHP").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x08);
});

it("PLA", function(){
asm.reset();
let res = asm.compile("PLA").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x68);
});

it("PLP", function(){
asm.reset();
let res = asm.compile("PLP").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x28);
});

it("TSX", function(){
asm.reset();
let res = asm.compile("TSX").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0xBA);
});

it("TXS", function(){
asm.reset();
let res = asm.compile("TXS").result();
expect(res.length).to.equal(1);
expect(res[0]).to.equal(0x9A);
});

// -------------------------------------------------------------
it("STX Zero Page");
it("STX Zero Page, Y");
it("STX Absolute");
// -------------------------------------------------------------
it("STY Zero Page");
it("STY Zero Page, X");
it("STY Absolute");

// -------------------------------------------------------------
});
});


test/utils/bitman.spec.js → test/unit.src.utils.bitman.spec.js View File

@@ -1,4 +1,4 @@
const BIT = require('../../src/utils/bitman.js');
const BIT = require('../src/utils/bitman.js');
const expect = require('chai').expect;

describe("Testing utils/bitman ...", function(){

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