6502/65816.js
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don't add the execute function by extending the prototype

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Preston Skupinski 2011-05-07 15:43:13 -04:00
parent 9254648308
commit 047095c8cc
1 changed files with 39 additions and 39 deletions
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78
cpu.js
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@ -85,6 +85,45 @@ function CPU_65816() {
0x7d : ADC_absolute_indexed_x,
0x79 : ADC_absolute_indexed_y,
0x75 : ADC_direct_page_indexed_x };
/**
* Take a raw hex string representing the program and execute it.
*/
this.execute = function(raw_hex, has_header) {
this.mmu.load_rom(raw_hex);
this.r.pc = 0x8000;
if(has_header) {
this.r.pc += 4096;
}
var executing = true;
while(executing) {
var b = this.mmu.read_byte(this.r.pc);
this.r.pc++;
// If we reach the end of the code then stop everything.
if(b==null) {
break;
}
var operation = this.opcode_map[b];
// Check if unsupported opcode.
if(operation==null) {
break;
}
var bytes_required = operation.bytes_required(this);
if(bytes_required===1) {
operation.execute(this);
} else {
var bytes = [];
for(var i = 1; i < bytes_required; i++) {
bytes.push(this.mmu.read_byte(this.r.pc));
this.r.pc++;
}
operation.execute(this,bytes);
}
}
}
}
var MMU = {
@ -1811,42 +1850,3 @@ var SEC = {
cpu.p.c = 1;
}
};
/**
* Take a raw hex string representing the program and execute it.
*/
CPU_65816.prototype.execute = function(raw_hex, has_header) {
this.mmu.load_rom(raw_hex);
this.r.pc = 0x8000;
if(has_header) {
this.r.pc += 4096;
}
var executing = true;
while(executing) {
var b = this.mmu.read_byte(this.r.pc);
this.r.pc++;
// If we reach the end of the code then stop everything.
if(b==null) {
break;
}
var operation = this.opcode_map[b];
// Check if unsupported opcode.
if(operation==null) {
break;
}
var bytes_required = operation.bytes_required(this);
if(bytes_required===1) {
operation.execute(this);
} else {
var bytes = [];
for(var i = 1; i < bytes_required; i++) {
bytes.push(this.mmu.read_byte(this.r.pc));
this.r.pc++;
}
operation.execute(this,bytes);
}
}
}