6502/65816.js
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Added executing only a set number of cycles per second and fixed the

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problems firefox had with it
This commit is contained in:
Preston Skupinski 2011-11-06 00:13:13 -04:00
parent a9b70c8ad0
commit 135be106d9
2 changed files with 31 additions and 10 deletions
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38
cpu.js
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@ -375,17 +375,37 @@ function CPU_65816() {
this.executing = false;
};
/**
* TODO: Add ability for this function to limit number of cpu cycles per
* second.
*/
this.execute = function(start_address) {
this.execute = function(start_address, max_cycles_per_second) {
// Default to 1MHz if no number given.
if(typeof max_cycles_per_second === "undefined")
max_cycles_per_second = 1000000;
this.r.pc = start_address;
this.timer_run(max_cycles_per_second, 1000);
};
this.timer_run = function(max_cycles_per_period, period) {
var start = new Date().getTime();
this.executing = true;
while(this.executing) {
this.step();
this.step();
// If execution stopped other than because of the cycle count
if(!this.executing) {
return;
}
if(this.cycle_count>=max_cycles_per_period) {
this.executing = false;
var now = new Date().getTime();
var wait = period - (now - start);
this.cycle_count = 0;
if(wait>0) {
setTimeout(this.timer_run.bind(this, max_cycles_per_period, period), wait);
} else {
this.timer_run(max_cycles_per_period, period);
}
}
}
};
};
this.reset = function() {
this.executing = false;
@ -2161,7 +2181,7 @@ var EOR_direct_page_indirect_indexed_y = {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle-count+=3;
cpu.cycle_count+=3;
if((cpu.r.d&0xff)!=0)
cpu.cycle_count++;
@ -2896,7 +2916,7 @@ var AND_direct_page_indirect_long = {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle-count+=4;
cpu.cycle_count+=4;
if((cpu.r.d&0xff)!=0)
cpu.cycle_count++;

3
index.html
View File

@ -11,7 +11,8 @@ $(document).ready(function() {
var can_step = false;
$("#execute").click(function() {
cpu.reset();
cpu.execute($("#hex").val());
cpu.load_binary($("#hex").val(), 0x8000);
cpu.execute(0x8000);
$("#load").removeAttr("disabled");
updateFields();
});