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/
65816.js
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wrote a generic template for the increment instructions that work on 

registers and used it for those instructions
This commit is contained in:
Preston Skupinski 2012-01-02 15:16:56 -05:00
parent 213398bc35
commit 2158ce0fb2
1 changed files with 26 additions and 60 deletions
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86
cpu.js
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@ -28,6 +28,29 @@ var cpu_lib = {
}
}
},
inc: {
Inc_register: function(register, flag) {
this.bytes_required = function() {
return 1;
};
this.execute = function(cpu) {
cpu.cycle_count+=2;
cpu.r[register]++;
if(cpu.p.e||cpu.p[flag]) {
cpu.r[register] &= 0xff;
cpu.p.n = cpu.r[register] >> 7;
} else {
cpu.r[register] &= 0xffff;
cpu.p.n = cpu.r[register] >> 15;
}
cpu_lib.r.p.check_z(cpu, cpu.r[register]);
};
}
},
addressing: {
Direct_page: function(instruction) {
this.bytes_required = function() {
@ -3232,68 +3255,11 @@ var DEC_direct_page_indexed_x = {
}
};
var INX = {
bytes_required:function() {
return 1;
},
execute:function(cpu) {
cpu.cycle_count+=2;
var INX = new cpu_lib.inc.Inc_register('x', 'x');
cpu.r.x++;
var INY = new cpu_lib.inc.Inc_register('y', 'x');
if(cpu.p.e||cpu.p.x) {
cpu.r.x &= 0xff;
cpu.p.n = cpu.r.x >> 7;
} else {
cpu.r.x &= 0xffff;
cpu.p.n = cpu.r.x >> 15;
}
cpu_lib.r.p.check_z(cpu, cpu.r.x);
}
};
var INY = {
bytes_required:function() {
return 1;
},
execute:function(cpu) {
cpu.cycle_count+=2;
cpu.r.y++;
if(cpu.p.e||cpu.p.x) {
cpu.r.y &= 0xff;
cpu.p.n = cpu.r.y >> 7;
} else {
cpu.r.y &= 0xffff;
cpu.p.n = cpu.r.y >> 15;
}
cpu_lib.r.p.check_z(cpu, cpu.r.y);
}
};
var INC_accumulator = {
bytes_required: function() {
return 1;
},
execute: function(cpu) {
cpu.cycle_count+=2;
cpu.r.a++;
if(cpu.p.e||cpu.p.m) {
cpu.r.a &= 0xff;
cpu.p.n = cpu.r.a >> 7;
} else {
cpu.r.a &= 0xffff;
cpu.p.n = cpu.r.a >> 15;
}
cpu_lib.r.p.check_z(cpu, cpu.r.a);
}
};
var INC_accumulator = new cpu_lib.inc.Inc_register('a', 'm');
var INC_absolute = {
bytes_required: function() {