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65816.js
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more work on emulation mode support, making sure that any operation that checks for 8-bit registers checks for emulation mode first

This commit is contained in:
Preston Skupinski 2011-05-11 12:41:07 -04:00
parent 25dbc8f08e
commit 4797ad0cd9
1 changed files with 88 additions and 94 deletions
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182
cpu.js
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@ -224,7 +224,7 @@ var MVN = {
cpu.mmu.store_byte(cpu.r.y, b);
cpu.r.x++;
cpu.r.y++;
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.r.x &= 0x00ff;
cpu.r.y &= 0x00ff;
} else {
@ -236,7 +236,7 @@ var MVN = {
cpu.r.a--;
cpu.r.pc-=3;
} else {
if(cpu.p.m)
if(cpu.p.e|cpu.p.m)
cpu.r.a = 0xff;
else
cpu.r.a = 0xffff;
@ -261,7 +261,7 @@ var MVP = {
cpu.mmu.store_byte(cpu.r.y,b);
var index_register_wrap;
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
index_register_wrap = 0xff;
} else {
index_register_wrap = 0xffff;
@ -283,7 +283,7 @@ var MVP = {
cpu.r.pc-=3;
cpu.r.a--;
} else {
if(cpu.p.m)
if(cpu.p.e|cpu.p.m)
cpu.r.a = 0xff;
else
cpu.r.a = 0xffff;
@ -449,7 +449,6 @@ var PHP = {
return 1;
},
execute:function(cpu) {
// TODO: Handle emulation mode.
var p_byte = (cpu.p.n<<7)|(cpu.p.v<<6)|(cpu.p.m<<5)|(cpu.p.x<<4)|
(cpu.p.d<<3)|(cpu.p.i<<2)|(cpu.p.z<<1)|cpu.p.c;
cpu.mmu.store_byte(cpu.r.s--, p_byte);
@ -461,7 +460,6 @@ var PLP = {
return 1;
},
execute:function(cpu) {
// TODO: Handle emulation mode.
var p_byte = cpu.mmu.read_byte(++cpu.r.s);
cpu.p.c = p_byte & 0x01;
cpu.p.z = (p_byte & 0x02) >> 1;
@ -479,7 +477,7 @@ var PHX = {
return 1;
},
execute:function(cpu) {
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.mmu.store_byte(cpu.r.s--, cpu.r.x);
} else {
var low_byte = cpu.r.x & 0x00ff;
@ -495,7 +493,7 @@ var PLX = {
return 1;
},
execute:function(cpu) {
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.r.x = cpu.mmu.read_byte(++cpu.r.s);
cpu.p.n = cpu.r.x >> 7;
} else {
@ -518,7 +516,7 @@ var PHY = {
return 1;
},
execute:function(cpu) {
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.mmu.store_byte(cpu.r.s--, cpu.r.y);
} else {
var low_byte = cpu.r.y & 0x00ff;
@ -534,7 +532,7 @@ var PLY = {
return 1;
},
execute:function(cpu) {
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.r.y = cpu.mmu.read_byte(++cpu.r.s);
cpu.p.n = cpu.r.y >> 7;
} else {
@ -557,7 +555,7 @@ var PHA = {
return 1;
},
execute:function(cpu) {
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
cpu.mmu.store_byte(cpu.r.s--, cpu.r.a);
} else {
var low_byte = cpu.r.a & 0x00ff;
@ -573,7 +571,7 @@ var PLA = {
return 1;
},
execute:function(cpu) {
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
cpu.r.a = cpu.mmu.read_byte(++cpu.r.s);
cpu.p.n = cpu.r.a >> 7;
} else {
@ -596,7 +594,7 @@ var ROR_accumulator = {
return 1;
},
execute:function(cpu) {
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
var old_c = cpu.p.c;
cpu.p.c = cpu.r.a & 0x01;
cpu.r.a = cpu.r.a >> 1;
@ -627,7 +625,7 @@ var ROR_absolute = {
execute:function(cpu,bytes) {
var location = (bytes[1]<<8)|bytes[0];
var shiftee;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
shiftee = cpu.mmu.read_byte(location);
var old_c = cpu.p.c;
cpu.p.c = shiftee & 0x01;
@ -667,7 +665,7 @@ var ROR_direct_page = {
execute:function(cpu,bytes) {
var location = bytes[0]+cpu.r.d;
var shiftee;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
shiftee = cpu.mmu.read_byte(location);
var old_c = cpu.p.c;
cpu.p.c = shiftee & 0x01;
@ -726,7 +724,7 @@ var ROL_accumulator = {
return 1;
},
execute:function(cpu) {
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
var old_c = cpu.p.c;
cpu.p.c = cpu.r.a >> 7;
cpu.r.a = cpu.r.a << 1;
@ -757,7 +755,7 @@ var ROL_absolute = {
execute:function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0];
var shiftee;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
shiftee = cpu.mmu.read_byte(location);
var old_c = cpu.p.c;
cpu.p.c = shiftee >> 7;
@ -797,7 +795,7 @@ var ROL_direct_page = {
execute:function(cpu, bytes) {
var location = bytes[0]+cpu.r.d;
var shiftee;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
shiftee = cpu.mmu.read_byte(location);
var old_c = cpu.p.c;
cpu.p.c = shiftee >> 7;
@ -856,7 +854,7 @@ var ASL_accumulator = {
return 1;
},
execute:function(cpu) {
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
cpu.p.c = cpu.r.a >> 7;
cpu.r.a = cpu.r.a << 1;
cpu.r.a &= 0xff;
@ -883,7 +881,7 @@ var ASL_absolute = {
execute:function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0];
var shiftee;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
shiftee = cpu.mmu.read_byte(location);
cpu.p.c = shiftee >> 7;
shiftee = shiftee << 1;
@ -919,7 +917,7 @@ var ASL_direct_page = {
execute:function(cpu,bytes) {
var location = bytes[0]+cpu.r.d;
var shiftee;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
shiftee = cpu.mmu.read_byte(location);
cpu.p.c = shiftee >> 7;
shiftee = shiftee << 1;
@ -974,11 +972,7 @@ var LSR_accumulator = {
return 1;
},
execute:function(cpu) {
if(cpu.p.m) {
cpu.p.c = cpu.r.a & 0x0001;
} else {
cpu.p.c = cpu.r.a & 0x01;
}
cpu.p.c = cpu.r.a & 1;
cpu.r.a = cpu.r.a >> 1;
cpu.p.n = 0;
@ -997,7 +991,7 @@ var LSR_absolute = {
execute:function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0];
var shiftee;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
shiftee = cpu.mmu.ready_byte(location);
cpu.p.c = shiftee & 0x0001;
shiftee = shiftee >> 1;
@ -1030,7 +1024,7 @@ var LSR_direct_page = {
execute:function(cpu, bytes) {
var location = bytes[0] + cpu.r.d;
var shiftee;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
shiftee = cpu.mmu.ready_byte(location);
cpu.p.c = shiftee & 0x0001;
shiftee = shiftee >> 1;
@ -1079,14 +1073,14 @@ var LSR_direct_page_indexed_x = {
var EOR_const = {
bytes_required:function(cpu) {
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
return 2;
} else {
return 3;
}
},
execute:function(cpu, bytes) {
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
cpu.r.a ^= bytes[0];
cpu.p.n = cpu.r.a >> 7;
} else {
@ -1108,7 +1102,7 @@ var EOR_absolute = {
},
execute:function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
EOR_const.execute(cpu, [cpu.mmu.read_byte(location)]);
} else {
var low_byte = cpu.mmu.read_byte(location);
@ -1124,7 +1118,7 @@ var EOR_direct_page = {
},
execute:function(cpu, bytes) {
var location = bytes[0] + cpu.r.d;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
EOR_const.execute(cpu, cpu.mmu.read_byte(location));
} else {
var low_byte = cpu.mmu.read_byte(location);
@ -1143,7 +1137,7 @@ var EOR_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) {
EOR_const.execute(cpu, [cpu.mmu.read_byte(absolute_location)]);
} else {
var low_byte = cpu.mmu.read_byte(absolute_location);
@ -1188,14 +1182,14 @@ var EOR_direct_page_indexed_x = {
var ORA_const = {
bytes_required:function(cpu) {
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
return 2;
} else {
return 3;
}
},
execute:function(cpu, bytes) {
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
cpu.r.a |= bytes[0];
cpu.p.n = cpu.r.a >> 7;
} else {
@ -1217,7 +1211,7 @@ var ORA_absolute = {
},
execute:function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
ORA_const.execute(cpu, [cpu.mmu.read_byte(location)]);
} else {
var low_byte = cpu.mmu.read_byte(location);
@ -1233,7 +1227,7 @@ var ORA_direct_page = {
},
execute:function(cpu, bytes) {
var location = bytes[0] + cpu.r.d;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
ORA_const.execute(cpu, cpu.mmu.read_byte(location));
} else {
var low_byte = cpu.mmu.read_byte(location);
@ -1252,7 +1246,7 @@ var ORA_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) {
ORA_const.execute(cpu, [cpu.mmu.read_byte(absolute_location)]);
} else {
var low_byte = cpu.mmu.read_byte(absolute_location);
@ -1297,14 +1291,14 @@ var ORA_direct_page_indexed_x = {
var AND_const = {
bytes_required:function(cpu) {
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
return 2;
} else {
return 3;
}
},
execute:function(cpu, bytes) {
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
cpu.r.a &= bytes[0];
cpu.p.n = cpu.r.a >> 7;
} else {
@ -1326,7 +1320,7 @@ var AND_absolute = {
},
execute:function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
AND_const.execute(cpu, [cpu.mmu.read_byte(location)]);
} else {
var low_byte = cpu.mmu.read_byte(location);
@ -1342,7 +1336,7 @@ var AND_direct_page = {
},
execute:function(cpu, bytes) {
var location = bytes[0] + cpu.r.d;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
AND_const.execute(cpu, cpu.mmu.read_byte(location));
} else {
var low_byte = cpu.mmu.read_byte(location);
@ -1361,7 +1355,7 @@ var AND_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) {
AND_const.execute(cpu, [cpu.mmu.read_byte(absolute_location)]);
} else {
var low_byte = cpu.mmu.read_byte(absolute_location);
@ -1407,7 +1401,7 @@ var AND_direct_page_indexed_x = {
var CPX_const = {
bytes_required:function(cpu) {
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
return 2;
} else {
return 3;
@ -1415,7 +1409,7 @@ var CPX_const = {
},
execute:function(cpu, bytes) {
var result;
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
result = cpu.r.x - bytes[0];
if(result<0) {
cpu.p.c = 0;
@ -1449,7 +1443,7 @@ var CPX_direct_page = {
},
execute:function(cpu, bytes) {
var location = bytes[0] + cpu.r.d;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
CPX_const.execute(cpu, cpu.mmu.read_byte(location));
} else {
var low_byte = cpu.mmu.read_byte(location);
@ -1465,7 +1459,7 @@ var CPX_absolute = {
},
execute:function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
CPX_const.execute(cpu, [cpu.mmu.read_byte(location)]);
} else {
var low_byte = cpu.mmu.read_byte(location);
@ -1477,7 +1471,7 @@ var CPX_absolute = {
var CPY_const = {
bytes_required:function(cpu) {
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
return 2;
} else {
return 3;
@ -1485,7 +1479,7 @@ var CPY_const = {
},
execute:function(cpu, bytes) {
var result;
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
result = cpu.r.y - bytes[0];
if(result<0) {
cpu.p.c = 0;
@ -1519,7 +1513,7 @@ var CPY_direct_page = {
},
execute:function(cpu, bytes) {
var location = bytes[0] + cpu.r.d;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
CPY_const.execute(cpu, cpu.mmu.read_byte(location));
} else {
var low_byte = cpu.mmu.read_byte(location);
@ -1535,7 +1529,7 @@ var CPY_absolute = {
},
execute:function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
CPY_const.execute(cpu, [cpu.mmu.read_byte(location)]);
} else {
var low_byte = cpu.mmu.read_byte(location);
@ -1547,7 +1541,7 @@ var CPY_absolute = {
var CMP_const = {
bytes_required:function(cpu) {
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
return 2;
} else {
return 3;
@ -1555,7 +1549,7 @@ var CMP_const = {
},
execute:function(cpu, bytes) {
var result;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
result = cpu.r.a - bytes[0];
if(result<0) {
cpu.p.c = 0;
@ -1589,7 +1583,7 @@ var CMP_direct_page = {
},
execute:function(cpu, bytes) {
var location = bytes[0] + cpu.r.d;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
CMP_const.execute(cpu, cpu.mmu.read_byte(location));
} else {
var low_byte = cpu.mmu.read_byte(location);
@ -1605,7 +1599,7 @@ var CMP_absolute = {
},
execute:function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
CMP_const.execute(cpu, [cpu.mmu.read_byte(location)]);
} else {
var low_byte = cpu.mmu.read_byte(location);
@ -1765,7 +1759,7 @@ 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);
@ -2087,8 +2081,8 @@ var TYA = {
return 1;
},
execute:function(cpu) {
if(cpu.p.m) {
if(cpu.p.x) {
if(cpu.p.e|cpu.p.m) {
if(cpu.p.e|cpu.p.x) {
// 8-bit index register to 8-bit accumulator.
cpu.r.a = cpu.r.y;
} else {
@ -2115,8 +2109,8 @@ var TAY = {
return 1;
},
execute:function(cpu) {
if(cpu.p.m) {
if(cpu.p.x) {
if(cpu.p.e|cpu.p.m) {
if(cpu.p.e|cpu.p.x) {
// 8-bit accumulator to 8-bit x index register.
cpu.r.y = cpu.r.a;
cpu.p.n = cpu.r.y >> 7;
@ -2151,8 +2145,8 @@ var TXA = {
return 1;
},
execute:function(cpu) {
if(cpu.p.m) {
if(cpu.p.x) {
if(cpu.p.e|cpu.p.m) {
if(cpu.p.e|cpu.p.x) {
// 8-bit index register to 8-bit accumulator.
cpu.r.a = cpu.r.x;
} else {
@ -2179,8 +2173,8 @@ var TAX = {
return 1;
},
execute:function(cpu) {
if(cpu.p.m) {
if(cpu.p.x) {
if(cpu.p.e|cpu.p.m) {
if(cpu.p.e|cpu.p.x) {
// 8-bit accumulator to 8-bit x index register.
cpu.r.x = cpu.r.a;
cpu.p.n = cpu.r.x >> 7;
@ -2221,7 +2215,7 @@ var TXY = {
cpu.p.z = 0;
}
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.p.n = cpu.r.y >> 7;
} else {
cpu.p.n = cpu.r.y >> 15;
@ -2241,7 +2235,7 @@ var TYX = {
cpu.p.z = 0;
}
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.p.n = cpu.r.y >> 7;
} else {
cpu.p.n = cpu.r.y >> 15;
@ -2255,7 +2249,7 @@ var STZ_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, 0);
} else {
cpu.mmu.store_byte(location, 0);
@ -2270,7 +2264,7 @@ var STZ_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, 0);
} else {
cpu.mmu.store_byte(location, 0);
@ -2285,7 +2279,7 @@ var STZ_absolute_indexed_x = {
},
execute: function(cpu, bytes) {
var location = ((bytes[1]<<8)|bytes[0])+cpu.r.x;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
cpu.mmu.store_byte(location, 0);
} else {
cpu.mmu.store_byte(location, 0);
@ -2300,7 +2294,7 @@ var STZ_direct_page_indexed_x = {
},
execute: function(cpu, bytes) {
var location = bytes[0]+cpu.p.d+cpu.r.x;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
cpu.mmu.store_byte(location, 0);
} else {
// Check for overflow.
@ -2326,7 +2320,7 @@ var STA_direct_page_indirect = {
},
execute:function(cpu, bytes) {
var location = bytes[0] + cpu.r.d;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
var low_byte_loc = cpu.mmu.read_byte(location);
var high_byte_loc = cpu.mmu.read_byte(location+1);
cpu.mmu.store_byte((high_byte_loc<<8) | low_byte_loc, cpu.r.a);
@ -2348,7 +2342,7 @@ var LDA_direct_page_indirect = {
},
execute:function(cpu, bytes) {
var location = bytes[0] + cpu.r.d;
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
var low_byte_loc = cpu.mmu.read_byte(location);
var high_byte_loc = cpu.mmu.read_byte(location+1);
cpu.r.a = cpu.mmu.read_byte((high_byte_loc<<8) | low_byte_loc);
@ -2376,7 +2370,7 @@ var LDA_direct_page_indexed_x = {
},
execute:function(cpu, bytes) {
var location = bytes[0] + cpu.r.d + cpu.r.x;
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 {
@ -2410,7 +2404,7 @@ var LDA_absolute_indexed_y = {
},
execute:function(cpu, bytes) {
var location = ((bytes[1]<<8)|bytes[0])+cpu.r.y;
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 {
@ -2433,7 +2427,7 @@ var LDA_absolute_indexed_x = {
},
execute:function(cpu, bytes) {
var location = ((bytes[1]<<8)|bytes[0])+cpu.r.x;
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 {
@ -2486,7 +2480,7 @@ var LDY_absolute_indexed_x = {
},
execute:function(cpu, bytes) {
var location = ((bytes[1]<<8)|bytes[0]) + cpu.r.x;
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 {
@ -2509,7 +2503,7 @@ var LDY_direct_page_indexed_x = {
},
execute:function(cpu, bytes) {
var location = bytes[0] + cpu.r.d + cpu.r.x;
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 {
@ -2589,7 +2583,7 @@ var DEX = {
},
execute:function(cpu) {
if(cpu.r.x===0) {
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.r.x = 0xff;
} else {
cpu.r.x = 0xffff;
@ -2598,7 +2592,7 @@ var DEX = {
cpu.p.z = 0;
} else {
cpu.r.x--;
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.p.n = cpu.r.x >> 7;
} else {
cpu.p.n = cpu.r.x >> 15;
@ -2619,7 +2613,7 @@ var DEY = {
},
execute:function(cpu) {
if(cpu.r.y===0) {
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.r.y = 0xff;
} else {
cpu.r.y = 0xffff;
@ -2629,7 +2623,7 @@ var DEY = {
} else {
cpu.r.y--;
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.p.n = cpu.r.y >> 7;
} else {
cpu.p.n = cpu.r.y >> 15;
@ -2917,7 +2911,7 @@ var STA_direct_page_indexed_x = {
},
execute: function(cpu, bytes) {
var location = bytes[0]+cpu.p.d+cpu.r.x;
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;
@ -2962,7 +2956,7 @@ var STA_absolute_indexed_x = {
},
execute: function(cpu, bytes) {
var location = ((bytes[1]<<8)|bytes[0])+cpu.r.x;
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;
@ -2979,7 +2973,7 @@ var STA_absolute_indexed_y = {
},
execute: function(cpu, bytes) {
var location = ((bytes[1]<<8)|bytes[0])+cpu.r.y;
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;
@ -2996,7 +2990,7 @@ var STY_direct_page_indexed_x = {
},
execute: function(cpu, bytes) {
var location = bytes[0]+cpu.p.d+cpu.r.x;
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.mmu.store_byte(location, cpu.r.y);
} else {
var high_byte = cpu.r.y >> 8;
@ -3024,7 +3018,7 @@ var STY_direct_page = {
},
execute: function(cpu, bytes) {
var location = bytes[0]+cpu.p.d;
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.mmu.store_byte(location, cpu.r.y);
} else {
var high_byte = cpu.r.y >> 8;
@ -3041,7 +3035,7 @@ var STY_absolute = {
},
execute: function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.mmu.store_byte(location, cpu.r.y);
} else {
var high_byte = cpu.r.y >> 8;
@ -3058,7 +3052,7 @@ var STX_direct_page_indexed_y = {
},
execute: function(cpu, bytes) {
var location = bytes[0]+cpu.p.d+cpu.r.y;
if(cpu.p.x===1) {
if(cpu.p.e|cpu.p.x) {
cpu.mmu.store_byte(location, cpu.r.x);
} else {
var high_byte = cpu.r.x >> 8;
@ -3086,7 +3080,7 @@ var STX_direct_page = {
},
execute: function(cpu, bytes) {
var location = bytes[0]+cpu.p.d;
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.mmu.store_byte(location, cpu.r.x);
} else {
var high_byte = cpu.r.x >> 8;
@ -3103,7 +3097,7 @@ var STX_absolute = {
},
execute: function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.x) {
if(cpu.p.e|cpu.p.x) {
cpu.mmu.store_byte(location, cpu.r.x);
} else {
var high_byte = cpu.r.x >> 8;
@ -3120,7 +3114,7 @@ var STA_absolute_long = {
},
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_long(location, bytes[2], cpu.r.a);
} else {
var high_byte = cpu.r.a >> 8;
@ -3177,7 +3171,7 @@ var LDX_direct_page_indexed_y = {
},
execute: function(cpu, bytes) {
var location = cpu.r.d + bytes[0] + cpu.r.y;
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 {
@ -3235,7 +3229,7 @@ var LDX_absolute_indexed_y = {
},
execute: function(cpu, bytes) {
var location = ((bytes[1]<<8)|bytes[0])+cpu.r.y;
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 {
@ -3281,7 +3275,7 @@ var LDA_absolute_long = {
},
execute: function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.m) {
if(cpu.p.e|cpu.p.m) {
cpu.r.a = cpu.mmu.read_byte_long(location, bytes[2]);
cpu.p.n = cpu.r.a >> 7;
} else {