6502
/
65816.js
mirror of https://github.com/pskupinski/65816.js.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

begin work on emulation mode support

This commit is contained in:
Preston Skupinski 2011-05-11 12:25:54 -04:00
parent 5347ced894
commit 25dbc8f08e
1 changed files with 47 additions and 47 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

94
cpu.js
View File

@ -181,7 +181,7 @@ var MMU = {
read_byte_long: function(location, bank) {
return this.memory[bank][location];
},
store_byte: function(location, b) {
this.memory[this.cpu.r.dbr][location] = b;
},
@ -1617,7 +1617,7 @@ var CMP_absolute = {
var SBC_const = {
bytes_required:function(cpu) {
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
return 2;
} else {
return 3;
@ -1625,7 +1625,7 @@ var SBC_const = {
},
execute:function(cpu, bytes) {
var old_a = cpu.r.a;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
cpu.r.a -= bytes[0] - cpu.p.c;
if(cpu.r.a < 0) {
cpu.p.c = 0;
@ -1678,7 +1678,7 @@ var SBC_direct_page = {
},
execute:function(cpu, bytes) {
var location = bytes[0] + cpu.r.d;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
SBC_const.execute(cpu, [cpu.mmu.read_byte(location)]);
} else {
var low_byte = cpu.mmu.read_byte(location);
@ -1694,7 +1694,7 @@ var SBC_absolute = {
},
execute:function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
SBC_const.execute(cpu, [cpu.mmu.read_byte(location)]);
} else {
var low_byte = cpu.mmu.read_byte(location);
@ -1713,7 +1713,7 @@ var SBC_direct_page_indirect = {
var low_byte_loc = cpu.mmu.read_byte(location);
var high_byte_loc = cpu.mmu.read_byte(location+1);
var absolute_location = (high_byte_loc<<8) | low_byte_loc;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
SBC_const.execute(cpu, [cpu.mmu.read_byte(absolute_location)]);
} else {
var low_byte = cpu.mmu.read_byte(absolute_location);
@ -1778,7 +1778,7 @@ var SBC_direct_page_indirect = {
var ADC_const = {
bytes_required:function(cpu) {
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
return 2;
} else {
return 3;
@ -1786,7 +1786,7 @@ var ADC_const = {
},
execute:function(cpu, bytes) {
var old_a = cpu.r.a;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
cpu.r.a += bytes[0] + cpu.p.c;
if(cpu.r.a & 0x100) {
cpu.p.c = 1;
@ -1839,7 +1839,7 @@ var ADC_absolute = {
},
execute:function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
ADC_const.execute(cpu, [cpu.mmu.read_byte(location)]);
} else {
var low_byte = cpu.mmu.read_byte(location);
@ -1855,7 +1855,7 @@ var ADC_direct_page = {
},
execute:function(cpu, bytes) {
var location = bytes[0] + cpu.r.d;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
ADC_const.execute(cpu, [cpu.mmu.read_byte(location)]);
} else {
var low_byte = cpu.mmu.read_byte(location);
@ -1874,7 +1874,7 @@ var ADC_direct_page_indirect = {
var low_byte_loc = cpu.mmu.read_byte(location);
var high_byte_loc = cpu.mmu.read_byte(location+1);
var absolute_location = (high_byte_loc<<8) | low_byte_loc;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
ADC_const.execute(cpu, [cpu.mmu.read_byte(absolute_location)]);
} else {
var low_byte = cpu.mmu.read_byte(absolute_location);
@ -2459,13 +2459,13 @@ var NOP = {
var LDY_const = {
bytes_required:function(cpu) {
if(cpu.p.x===0)
return 3;
else
if(cpu.p.e|cpu.p.x)
return 2;
else
return 3;
},
execute:function(cpu, bytes) {
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.r.y = bytes[0];
cpu.p.n = cpu.r.y >> 7;
} else {
@ -2543,7 +2543,7 @@ var LDY_absolute = {
},
execute:function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.r.y = cpu.mmu.read_byte(location);
cpu.p.n = cpu.r.y >> 7;
} else {
@ -2566,7 +2566,7 @@ var LDY_direct_page = {
},
execute:function(cpu, bytes) {
var location = bytes[0] + cpu.r.d;
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.r.y = cpu.mmu.read_byte(location);
cpu.p.n = cpu.r.y >> 7;
} else {
@ -2650,7 +2650,7 @@ var DEC_accumulator = {
},
execute: function(cpu) {
if(cpu.r.a===0) {
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.r.a = 0xff;
} else {
cpu.r.a = 0xffff;
@ -2659,7 +2659,7 @@ var DEC_accumulator = {
cpu.p.z = 0;
} else {
cpu.r.a--;
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.r.a &= 0xff;
cpu.p.n = cpu.r.a >> 7;
} else {
@ -2683,7 +2683,7 @@ var DEC_absolute = {
execute: function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0]
var temp;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
temp = cpu.mmu.read_byte(location);
if(temp===0) {
cpu.mmu.store_byte(location, 0xff);
@ -2731,7 +2731,7 @@ var DEC_direct_page = {
execute: function(cpu, bytes) {
var location = bytes[0] + cpu.r.d;
var temp;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
temp = cpu.mmu.read_byte(location);
if(temp===0) {
cpu.mmu.store_byte(location, 0xff);
@ -2779,7 +2779,7 @@ var INX = {
execute:function(cpu) {
cpu.r.x++;
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.r.x &= 0xff;
cpu.p.n = cpu.r.x >> 7;
} else {
@ -2801,7 +2801,7 @@ var INY = {
},
execute:function(cpu) {
cpu.r.y++;
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.r.y &= 0xff;
cpu.p.n = cpu.r.y >> 7;
} else {
@ -2823,7 +2823,7 @@ var INC_accumulator = {
},
execute: function(cpu) {
cpu.r.a++;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
cpu.r.a &= 0xff;
cpu.p.n = cpu.r.a >> 7;
} else {
@ -2846,7 +2846,7 @@ var INC_absolute = {
execute: function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0]
var temp;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
temp = cpu.mmu.read_byte(location) + 1;
temp &= 0xff;
cpu.p.n = temp >> 7;
@ -2882,7 +2882,7 @@ var INC_direct_page = {
execute: function(cpu, bytes) {
var location = bytes[0] + cpu.r.d;
var temp;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
temp = cpu.mmu.read_byte(location) + 1;
temp &= 0xff;
cpu.mmu.store_byte(location, temp);
@ -2945,7 +2945,7 @@ var STA_direct_page = {
},
execute: function(cpu, bytes) {
var location = bytes[0]+cpu.p.d;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
cpu.mmu.store_byte(location, cpu.r.a);
} else {
var high_byte = cpu.r.a >> 8;
@ -3137,7 +3137,7 @@ var STA_absolute = {
},
execute: function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
cpu.mmu.store_byte(location, cpu.r.a);
} else {
var high_byte = cpu.r.a >> 8;
@ -3154,7 +3154,7 @@ var LDX_direct_page = {
},
execute: function(cpu, bytes) {
var location = cpu.r.d + bytes[0];
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.r.x = cpu.mmu.read_byte(location);
cpu.p.n = cpu.r.x >> 7;
} else {
@ -3212,7 +3212,7 @@ var LDA_direct_page = {
},
execute: function(cpu, bytes) {
var location = bytes[0] + cpu.r.d;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
cpu.r.a = cpu.mmu.read_byte(location);
cpu.p.n = cpu.r.a >> 7;
} else {
@ -3258,7 +3258,7 @@ var LDX_absolute = {
},
execute: function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.r.x = cpu.mmu.read_byte(location);
cpu.p.n = cpu.r.x >> 7;
} else {
@ -3304,7 +3304,7 @@ var LDA_absolute = {
},
execute: function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.m===1) {
if(cpu.p.e|cpu.p.m) {
cpu.r.a = cpu.mmu.read_byte(location);
cpu.p.n = cpu.r.a >> 7;
} else {
@ -3323,19 +3323,19 @@ var LDA_absolute = {
var LDA_const = {
bytes_required: function(cpu) {
if(cpu.p.m===0) {
return 3;
} else {
if(cpu.p.e|cpu.p.m) {
return 2;
} else {
return 3;
}
},
execute: function(cpu, bytes) {
if(cpu.p.m===0) {
cpu.r.a = (bytes[1]<<8)|bytes[0];
cpu.p.n = cpu.r.a >> 15;
} else {
if(cpu.p.e|cpu.p.m) {
cpu.r.a = bytes[0];
cpu.p.n = cpu.r.a >> 7;
} else {
cpu.r.a = (bytes[1]<<8)|bytes[0];
cpu.p.n = cpu.r.a >> 15;
}
if(cpu.r.a===0) {
cpu.p.z = 1;
@ -3347,21 +3347,21 @@ var LDA_const = {
var LDX_const = {
bytes_required: function(cpu) {
if(cpu.p.x===0) {
return 3;
if(cpu.p.e|cpu.p.x) {
return 2;
} else {
return 2;
return 3;
}
},
execute: function(cpu, bytes) {
var constant;
if(cpu.p.x===0) {
cpu.r.x = (bytes[1]<<8)|bytes[0];
cpu.p.n = cpu.r.x >> 15;
} else {
if(cpu.p.e|cpu.p.x) {
cpu.r.x = bytes[0];
cpu.p.n = cpu.r.x >> 7;
}
} else {
cpu.r.x = (bytes[1]<<8)|bytes[0];
cpu.p.n = cpu.r.x >> 15;
}
if(cpu.r.x===0) {
cpu.p.z = 1;
} else {