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65816.js
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numerous more instructions now feature cycle counting

This commit is contained in:
Preston Skupinski 2011-10-29 20:53:32 -04:00
parent fdaf4dd024
commit 5a44410146
1 changed files with 230 additions and 26 deletions
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256
cpu.js
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@ -737,12 +737,15 @@ var BIT_const = {
return 3;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=2;
var and_result;
if(cpu.p.e|cpu.p.m) {
cpu.p.n = bytes[0] >> 7;
cpu.p.v = (bytes[0] >> 6) & 0x1;
and_result = cpu.r.a & bytes[0];
} else {
cpu.cycle_count++;
var argument = (bytes[1]<<8)|bytes[0];
cpu.p.n = bytes[1] >> 7;
cpu.p.v = (bytes[1] >> 6) & 0x1;
@ -762,6 +765,8 @@ var BIT_absolute = {
return 3;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=2;
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.e|cpu.p.m) {
BIT_const.execute(cpu, [cpu.mmu.read_byte(location)]);
@ -778,6 +783,11 @@ var BIT_direct_page = {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count++;
if((cpu.r.d&0xff)!=0)
cpu.cycle_count++;
var location = bytes[0] + cpu.r.d;
if(cpu.p.e|cpu.p.m) {
BIT_const.execute(cpu, [cpu.mmu.read_byte(location)]);
@ -794,6 +804,11 @@ var BIT_direct_page_indexed_x = {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=2;
if((cpu.r.d&0xff)!=0)
cpu.cycle_count++;
if(cpu.p.e) {
var location = (bytes[0] + cpu.r.x) & 0xff;
var low_byte_loc = cpu.mmu.read_byte_long((location+cpu.r.d)&0xffff, 0);
@ -831,7 +846,12 @@ var BIT_absolute_indexed_x = {
return 3;
},
execute:function(cpu, bytes) {
var location = ((bytes[1]<<8)|bytes[0])+cpu.r.x;
var original_location = (bytes[1]<<8)|bytes[0];
var location = original_location+cpu.r.x;
if((original_location&0xff00)!=(location&0xff00))
cpu.cycle_count++;
var location_high_byte = location >> 8;
var location_low_byte = location & 0x00ff;
BIT_absolute.execute(cpu, [location_low_byte, location_high_byte]);
@ -905,6 +925,8 @@ var MVN = {
return 3;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=7;
// TODO: One piece of reference material I've read claims that this
// operation should always work with a 16-bit accumulator even if in
// emulation mode or the m bit is set to 1, in those cases it claims that
@ -942,6 +964,8 @@ var MVP = {
return 3;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=7;
// TODO: One piece of reference material I've read claims that this
// operation should always work with a 16-bit accumulator even if in
// emulation mode or the m bit is set to 1, in those cases it claims that
@ -1744,6 +1768,8 @@ var LSR_accumulator = {
return 1;
},
execute:function(cpu) {
cpu.cycle_count+=2;
cpu.p.c = cpu.r.a & 1;
cpu.r.a = cpu.r.a >> 1;
@ -1761,6 +1787,8 @@ var LSR_absolute = {
return 3;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=6;
var location = (bytes[1]<<8)|bytes[0];
var shiftee;
if(cpu.p.e|cpu.p.m) {
@ -1769,6 +1797,8 @@ var LSR_absolute = {
shiftee = shiftee >> 1;
cpu.mmu.store_byte(location, shiftee);
} else {
cpu.cycle_count+=2;
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
shiftee = (high_byte<<8)|low_byte;
@ -1794,6 +1824,11 @@ var LSR_direct_page = {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=5;
if((cpu.r.d&0xff)!=0)
cpu.cycle_count++;
var location = bytes[0] + cpu.r.d;
var shiftee;
if(cpu.p.e|cpu.p.m) {
@ -1802,6 +1837,8 @@ var LSR_direct_page = {
shiftee = shiftee >> 1;
cpu.mmu.store_byte(location, shiftee);
} else {
cpu.cycle_count+=2;
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
shiftee = (high_byte<<8)|low_byte;
@ -1827,6 +1864,8 @@ var LSR_absolute_indexed_x = {
return 3;
},
execute:function(cpu, bytes) {
cpu.cycle_count++;
var location = ((bytes[1]<<8)|bytes[0])+cpu.r.x;
var location_high_byte = location >> 8;
var location_low_byte = location & 0x00ff;
@ -1839,6 +1878,7 @@ var LSR_direct_page_indexed_x = {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count++;
LSR_direct_page.execute(cpu, [bytes[0]+cpu.r.x]);
}
};
@ -2863,6 +2903,8 @@ var CPX_const = {
}
},
execute:function(cpu, bytes) {
cpu.cycle_count+=2;
var result;
if(cpu.p.e|cpu.p.x) {
result = cpu.r.x - bytes[0];
@ -2874,6 +2916,8 @@ var CPX_const = {
}
cpu.p.n = result >> 7;
} else {
cpu.cycle_count++;
result = cpu.r.x - ((bytes[1]<<8)|bytes[0]);
if(result<0) {
cpu.p.c = 0;
@ -2897,6 +2941,11 @@ var CPX_direct_page = {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count++;
if((cpu.r.d&0xff)!=0)
cpu.cycle_count++;
var location = bytes[0] + cpu.r.d;
if(cpu.p.e|cpu.p.m) {
CPX_const.execute(cpu, [cpu.mmu.read_byte(location)]);
@ -2913,6 +2962,8 @@ var CPX_absolute = {
return 3;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=2;
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.e|cpu.p.x) {
CPX_const.execute(cpu, [cpu.mmu.read_byte(location)]);
@ -2933,6 +2984,8 @@ var CPY_const = {
}
},
execute:function(cpu, bytes) {
cpu.cycle_count+=2;
var result;
if(cpu.p.e|cpu.p.x) {
result = cpu.r.y - bytes[0];
@ -2944,6 +2997,7 @@ var CPY_const = {
}
cpu.p.n = result >> 7;
} else {
cpu.cycle_count++;
result = cpu.r.y - ((bytes[1]<<8)|bytes[0]);
if(result<0) {
cpu.p.c = 0;
@ -2967,6 +3021,11 @@ var CPY_direct_page = {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count++;
if((cpu.r.d&0xff)!=0)
cpu.cycle_count++;
var location = bytes[0] + cpu.r.d;
if(cpu.p.e|cpu.p.m) {
CPY_const.execute(cpu, [cpu.mmu.read_byte(location)]);
@ -2983,6 +3042,8 @@ var CPY_absolute = {
return 3;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=2;
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.e|cpu.p.x) {
CPY_const.execute(cpu, [cpu.mmu.read_byte(location)]);
@ -3540,25 +3601,6 @@ var SBC_absolute_long_indexed_x = {
}
};
var SBC_direct_page_indirect = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
var location = bytes[0] + cpu.r.d;
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.e|cpu.p.m) {
SBC_const.execute(cpu, [cpu.mmu.read_byte(absolute_location)]);
} else {
var low_byte = cpu.mmu.read_byte(absolute_location);
var high_byte = cpu.mmu.read_byte(absolute_location+1);
SBC_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var SBC_direct_page_indexed_x_indirect = {
bytes_required:function() {
return 2;
@ -5155,6 +5197,11 @@ var LDA_direct_page_indirect = {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=5;
if((cpu.r.d&0xff)!=0)
cpu.cycle_count++;
var location = bytes[0] + cpu.r.d;
if(cpu.p.e|cpu.p.m) {
var low_byte_loc = cpu.mmu.read_byte(location);
@ -5162,6 +5209,8 @@ var LDA_direct_page_indirect = {
cpu.r.a = cpu.mmu.read_byte((high_byte_loc<<8) | low_byte_loc);
cpu.p.n = cpu.r.a >> 7;
} else {
cpu.cycle_count++;
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;
@ -5183,6 +5232,11 @@ var LDA_direct_page_indexed_x_indirect = {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=6;
if((cpu.r.d&0xff)!=0)
cpu.cycle_count++;
if(cpu.p.e) {
var location = (bytes[0] + cpu.r.x) & 0xff;
var low_byte_loc = cpu.mmu.read_byte_long((location+cpu.r.d)&0xffff, 0);
@ -5197,6 +5251,8 @@ var LDA_direct_page_indexed_x_indirect = {
cpu.r.a = cpu.mmu.read_byte((high_byte_loc<<8)|low_byte_loc);
cpu.p.n = cpu.r.a >> 7;
} else {
cpu.cycle_count++;
var location = bytes[0] + cpu.r.d + cpu.r.x;
var low_byte_loc = cpu.mmu.read_byte(location);
var high_byte_loc = cpu.mmu.read_byte((location+1)&0xffff);
@ -5227,6 +5283,11 @@ var LDA_direct_page_indirect_long = {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=6;
if((cpu.r.d&0xff)!=0)
cpu.cycle_count++;
var location = bytes[0] + cpu.r.d;
if(cpu.p.e|cpu.p.m) {
var low_byte_loc = cpu.mmu.read_byte(location&0xffff);
@ -5236,6 +5297,8 @@ var LDA_direct_page_indirect_long = {
bank_byte);
cpu.p.n = cpu.r.a >> 7;
} else {
cpu.cycle_count++;
var low_byte_loc = cpu.mmu.read_byte(location&0xffff);
var high_byte_loc = cpu.mmu.read_byte((location+1)&0xffff);
var bank_byte = cpu.mmu.read_byte((location+2)&0xffff);
@ -5259,6 +5322,11 @@ var LDA_direct_page_indirect_long_indexed_y = {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=6;
if((cpu.r.d&0xff)!=0)
cpu.cycle_count++;
var location = bytes[0] + cpu.r.d;
if(cpu.p.e|cpu.p.m) {
var low_byte_loc = cpu.mmu.read_byte(location&0xffff);
@ -5272,6 +5340,8 @@ var LDA_direct_page_indirect_long_indexed_y = {
cpu.r.a = cpu.mmu.read_byte_long(absolute_location, bank_byte);
cpu.p.n = cpu.r.a >> 7;
} else {
cpu.cycle_count++;
var low_byte_loc = cpu.mmu.read_byte(location&0xffff);
var high_byte_loc = cpu.mmu.read_byte((location+1)&0xffff);
var bank_byte = cpu.mmu.read_byte((location+2)&0xffff);
@ -5303,17 +5373,34 @@ var LDA_direct_page_indirect_indexed_y = {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=5;
if((cpu.r.d&0xff)!=0)
cpu.cycle_count++;
var location = bytes[0] + cpu.r.d;
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);
var absolute_location = ((high_byte<<8) | low_byte) + cpu.r.y;
var original_location = (high_byte_loc<<8)|low_byte_loc;
var absolute_location = original_location + cpu.r.y;
if((original_location&0xff00)!=(absolute_location&0xff00))
cpu.cycle_count++;
cpu.r.a = cpu.mmu.read_byte(absolute_location);
cpu.p.n = cpu.r.a >> 7;
} else {
cpu.cycle_count++;
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) + cpu.r.y;
var original_location = (high_byte_loc<<8) | low_byte_loc;
var absolute_location = original_location + cpu.r.y;
if((original_location&0xff00)!=(absolute_location&0xff00))
cpu.cycle_count++;
var low_byte = cpu.mmu.read_byte(absolute_location);
var high_byte = cpu.mmu.read_byte(absolute_location+1);
cpu.r.a = (high_byte<<8) | low_byte;
@ -5332,11 +5419,18 @@ var LDA_direct_page_indexed_x = {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=4;
if((cpu.r.d&0xff)!=0)
cpu.cycle_count++;
var location = bytes[0] + cpu.r.d + cpu.r.x;
if(cpu.p.e|cpu.p.m) {
cpu.r.a = cpu.mmu.read_byte(location);
cpu.p.n = cpu.r.a >> 7;
} else {
cpu.cycle_count++;
var low_byte = cpu.mmu.read_byte(location&0xffff);
var high_byte = cpu.mmu.read_byte((location+1)&0xffff);
cpu.r.a = low_byte | (high_byte<<8);
@ -5355,11 +5449,20 @@ var LDA_absolute_indexed_y = {
return 3;
},
execute:function(cpu, bytes) {
var location = ((bytes[1]<<8)|bytes[0])+cpu.r.y;
cpu.cycle_count+=4;
var original_location = (bytes[1]<<8)|bytes[0];
var location = original_location+cpu.r.y;
if((original_location&0xff00)!=(location&0xff00))
cpu.cycle_count++;
if(cpu.p.e|cpu.p.m) {
cpu.r.a = cpu.mmu.read_byte(location);
cpu.p.n = cpu.r.a >> 7;
} else {
cpu.cycle_count++;
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
cpu.r.a = (high_byte<<8) | low_byte;
@ -5378,11 +5481,20 @@ var LDA_absolute_indexed_x = {
return 3;
},
execute:function(cpu, bytes) {
var location = ((bytes[1]<<8)|bytes[0])+cpu.r.x;
cpu.cycle_count+=4;
var original_location = (bytes[1]<<8)|bytes[0];
var location = original_location+cpu.r.x;
if((original_location&0xff00)!=(location&0xff00))
cpu.cycle_count++;
if(cpu.p.e|cpu.p.m) {
cpu.r.a = cpu.mmu.read_byte(location);
cpu.p.n = cpu.r.a >> 7;
} else {
cpu.cycle_count++;
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
cpu.r.a = (high_byte<<8) | low_byte;
@ -5401,6 +5513,8 @@ var LDA_stack_relative = {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=4;
if(cpu.p.e) {
var location = 0x100 | ((cpu.r.s + bytes[0]) & 0xff);
LDA_const.execute(cpu, [cpu.mmu.read_byte(location)]);
@ -5408,6 +5522,7 @@ var LDA_stack_relative = {
if(cpu.p.m) {
LDA_const.execute(cpu, [cpu.mmu.read_byte(cpu.r.s+bytes[0])]);
} else {
cpu.cycle_count++;
var location = cpu.r.s + bytes[0];
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
@ -5422,6 +5537,8 @@ var LDA_stack_relative_indirect_indexed_y = {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=7;
if(cpu.p.e) {
var location_loc = 0x100 | ((cpu.r.s + bytes[0]) & 0xff);
var low_byte = cpu.mmu.read_byte(location_loc);
@ -5454,6 +5571,8 @@ var LDA_stack_relative_indirect_indexed_y = {
}
LDA_const.execute(cpu, [b]);
} else {
cpu.cycle_count++;
var low_byte;
var high_byte;
if(absolute_location>=0x10000) {
@ -5491,10 +5610,14 @@ var LDY_const = {
return 3;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=2;
if(cpu.p.e|cpu.p.x) {
cpu.r.y = bytes[0];
cpu.p.n = cpu.r.y >> 7;
} else {
cpu.cycle_count++;
cpu.r.y = (bytes[1]<<8)|bytes[0];
cpu.p.n = cpu.r.y >> 15;
}
@ -5511,11 +5634,20 @@ var LDY_absolute_indexed_x = {
return 3;
},
execute:function(cpu, bytes) {
var location = ((bytes[1]<<8)|bytes[0]) + cpu.r.x;
cpu.cycle_count+=4;
var original_location = (bytes[1]<<8)|bytes[0];
var location = original_location + cpu.r.x;
if((original_location&0xff00)!=(location&0xff00))
cpu.cycle_count++;
if(cpu.p.e|cpu.p.x) {
cpu.r.y = cpu.mmu.read_byte(location);
cpu.p.n = cpu.r.y >> 7;
} else {
cpu.cycle_count++;
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
cpu.r.y = (high_byte<<8) | low_byte;
@ -5534,11 +5666,18 @@ var LDY_direct_page_indexed_x = {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=4;
if((cpu.r.d&0xff)!=0)
cpu.cycle_count++;
var location = bytes[0] + cpu.r.d + cpu.r.x;
if(cpu.p.e|cpu.p.x) {
cpu.r.y = cpu.mmu.read_byte(location);
cpu.p.n = cpu.r.y >> 7;
} else {
cpu.cycle_count++;
var low_byte = cpu.mmu.read_byte(location&0xffff);
var high_byte = cpu.mmu.read_byte((location+1)&0xffff);
cpu.r.y = (high_byte<<8) | low_byte;
@ -5557,11 +5696,15 @@ var LDY_absolute = {
return 3;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=4;
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.e|cpu.p.x) {
cpu.r.y = cpu.mmu.read_byte(location);
cpu.p.n = cpu.r.y >> 7;
} else {
cpu.cycle_count++;
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
cpu.r.y = (high_byte<<8) | low_byte;
@ -5580,11 +5723,18 @@ var LDY_direct_page = {
return 2;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=3;
if((cpu.r.d&0xff)!=0)
cpu.cycle_count++;
var location = bytes[0] + cpu.r.d;
if(cpu.p.e|cpu.p.x) {
cpu.r.y = cpu.mmu.read_byte(location);
cpu.p.n = cpu.r.y >> 7;
} else {
cpu.cycle_count++;
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
cpu.r.y = (high_byte<<8) | low_byte;
@ -6386,11 +6536,18 @@ var LDX_direct_page = {
return 2;
},
execute: function(cpu, bytes) {
cpu.cycle_count+=3;
if((cpu.r.d&0xff)!=0)
cpu.cycle_count++;
var location = cpu.r.d + bytes[0];
if(cpu.p.e|cpu.p.x) {
cpu.r.x = cpu.mmu.read_byte(location);
cpu.p.n = cpu.r.x >> 7;
} else {
cpu.cycle_count++;
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
cpu.r.x = (high_byte<<8) | low_byte;
@ -6409,11 +6566,18 @@ var LDX_direct_page_indexed_y = {
return 2;
},
execute: function(cpu, bytes) {
cpu.cycle_count+=4;
if((cpu.r.d&0xff)!=0)
cpu.cycle_count++;
var location = cpu.r.d + bytes[0] + cpu.r.y;
if(cpu.p.e|cpu.p.x) {
cpu.r.x = cpu.mmu.read_byte(location);
cpu.p.n = cpu.r.x >> 7;
} else {
cpu.cycle_count++;
var low_byte = cpu.mmu.read_byte(location&0xffff);
var high_byte = cpu.mmu.read_byte((location+1)&0xffff);
cpu.r.x = (high_byte<<8) | low_byte;
@ -6433,11 +6597,18 @@ var LDA_direct_page = {
return 2;
},
execute: function(cpu, bytes) {
cpu.cycle_count+=3;
if((cpu.r.d&0xff)!=0)
cpu.cycle_count++;
var location = bytes[0] + cpu.r.d;
if(cpu.p.e|cpu.p.m) {
cpu.r.a = cpu.mmu.read_byte(location);
cpu.p.n = cpu.r.a >> 7;
} else {
cpu.cycle_count++;
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
cpu.r.a = (high_byte<<8) | low_byte;
@ -6456,11 +6627,20 @@ var LDX_absolute_indexed_y = {
return 3;
},
execute: function(cpu, bytes) {
var location = ((bytes[1]<<8)|bytes[0])+cpu.r.y;
cpu.cycle_count+=4;
var original_location = (bytes[1]<<8)|bytes[0];
var location = original_location+cpu.r.y;
if((original_location&0xff00)!=(location&0xff00))
cpu.cycle_count++;
if(cpu.p.e|cpu.p.x) {
cpu.r.x = cpu.mmu.read_byte(location);
cpu.p.n = cpu.r.x >> 7;
} else {
cpu.cycle_count++;
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
cpu.r.x = (high_byte<<8) | low_byte;
@ -6479,11 +6659,15 @@ var LDX_absolute = {
return 3;
},
execute: function(cpu, bytes) {
cpu.cycle_count+=4;
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.e|cpu.p.x) {
cpu.r.x = cpu.mmu.read_byte(location);
cpu.p.n = cpu.r.x >> 7;
} else {
cpu.cycle_count++;
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
cpu.r.x = (high_byte<<8) | low_byte;
@ -6502,11 +6686,15 @@ var LDA_absolute_long = {
return 4;
},
execute: function(cpu, bytes) {
cpu.cyclce_count+=5;
var location = (bytes[1]<<8)|bytes[0];
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 {
cpu.cycle_count++;
var low_byte = cpu.mmu.read_byte_long(location, bytes[2]);
var high_byte = cpu.mmu.read_byte_long(location+1, bytes[2]);
cpu.r.a = (high_byte<<8) | low_byte;
@ -6525,6 +6713,8 @@ var LDA_absolute_long_indexed_x = {
return 4;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=5;
var location = ((bytes[1]<<8)|bytes[0]) + cpu.r.x;
if(location & 0x10000) {
bytes[2]++;
@ -6535,6 +6725,8 @@ var LDA_absolute_long_indexed_x = {
cpu.r.a = cpu.mmu.read_byte_long(location, bytes[2]);
cpu.p.n = cpu.r.a >> 7;
} else {
cpu.cycle_count++;
var low_byte = cpu.mmu.read_byte_long(location, bytes[2]);
location++;
if(location & 0x10000) {
@ -6558,11 +6750,15 @@ var LDA_absolute = {
return 3;
},
execute: function(cpu, bytes) {
cpu.cycle_count+=4;
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.e|cpu.p.m) {
cpu.r.a = cpu.mmu.read_byte(location);
cpu.p.n = cpu.r.a >> 7;
} else {
cpu.cycle_count++;
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
cpu.r.a = (high_byte<<8) | low_byte;
@ -6585,10 +6781,14 @@ var LDA_const = {
}
},
execute: function(cpu, bytes) {
cpu.cycle_count+=2;
if(cpu.p.e|cpu.p.m) {
cpu.r.a = bytes[0];
cpu.p.n = cpu.r.a >> 7;
} else {
cpu.cycle_count++;
cpu.r.a = (bytes[1]<<8)|bytes[0];
cpu.p.n = cpu.r.a >> 15;
}
@ -6609,11 +6809,15 @@ var LDX_const = {
}
},
execute: function(cpu, bytes) {
cpu.cycle_count+=2;
var constant;
if(cpu.p.e|cpu.p.x) {
cpu.r.x = bytes[0];
cpu.p.n = cpu.r.x >> 7;
} else {
cpu.cycle_count++;
cpu.r.x = (bytes[1]<<8)|bytes[0];
cpu.p.n = cpu.r.x >> 15;
}