6502/65816.js
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added direct page indirect indexed y addressing mode for those operations that support it

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Preston Skupinski 2011-05-13 14:58:10 -04:00
parent e2341a63a1
commit 7b821a0473
1 changed files with 194 additions and 1 deletions
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195
cpu.js
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@ -51,6 +51,7 @@ function CPU_65816() {
0xa5 : LDA_direct_page, 0xbd : LDA_absolute_indexed_x,
0xb9 : LDA_absolute_indexed_y,
0xb2 : LDA_direct_page_indirect,
0xb1 : LDA_direct_page_indirect_indexed_y,
0xa2 : LDX_const,
0xae : LDX_absolute, 0xa6 : LDX_direct_page,
0xa0 : LDY_const, 0xbc : LDY_absolute_indexed_x,
@ -61,6 +62,7 @@ function CPU_65816() {
0x8d : STA_absolute, 0x85 : STA_direct_page,
0x8f : STA_absolute_long,
0x92 : STA_direct_page_indirect,
0x91 : STA_direct_page_indirect_indexed_y,
0x9d : STA_absolute_indexed_x,
0x99 : STA_absolute_indexed_y,
0x95 : STA_direct_page_indexed_x,
@ -83,32 +85,39 @@ function CPU_65816() {
0x50 : BVC, 0x70 : BVS, 0x10 : BPL, 0x30 : BMI,
0x69 : ADC_const, 0x6d : ADC_absolute,
0x65 : ADC_direct_page, 0x72 : ADC_direct_page_indirect,
0x71 : ADC_direct_page_indirect_indexed_y,
0x7d : ADC_absolute_indexed_x,
0x79 : ADC_absolute_indexed_y,
0x75 : ADC_direct_page_indexed_x, 0xe9 : SBC_const,
0xed : SBC_absolute, 0xe5 : SBC_direct_page,
0xf2 : SBC_direct_page_indirect,
0xf1 : SBC_direct_page_indirect_indexed_y,
0xfd : SBC_absolute_indexed_x,
0xf9 : SBC_absolute_indexed_y,
0xe1 : SBC_direct_page_indexed_x,
0xc9 : CMP_const, 0xc5 : CMP_direct_page,
0xcd : CMP_absolute, 0xe0 : CPX_const,
0xcd : CMP_absolute, 0xd2 : CMP_direct_page_indirect,
0xd1 : CMP_direct_page_indirect_indexed_y,
0xe0 : CPX_const,
0xec : CPX_absolute, 0xe4 : CPX_direct_page,
0xc0 : CPY_const, 0xcc : CPY_absolute,
0xc4 : CPY_direct_page, 0x29 : AND_const,
0x2d : AND_absolute, 0x25 : AND_direct_page,
0x32 : AND_direct_page_indirect,
0x31 : AND_direct_page_indirect_indexed_y,
0x3d : AND_absolute_indexed_x,
0x39 : AND_absolute_indexed_y,
0x35 : AND_direct_page_indexed_x, 0x09 : ORA_const,
0x0d : ORA_absolute, 0x05 : ORA_direct_page,
0x12 : ORA_direct_page_indirect,
0x11 : ORA_direct_page_indirect_indexed_y,
0x1d : ORA_absolute_indexed_x,
0x1f : ORA_absolute_indexed_y,
0x15 : ORA_direct_page_indexed_x,
0x49 : EOR_const, 0x4d : EOR_absolute,
0x45 : EOR_direct_page,
0x52 : EOR_direct_page_indirect,
0x51 : EOR_direct_page_indirect_indexed_y,
0x5d : EOR_absolute_indexed_x,
0x59 : EOR_absolute_indexed_y,
0x55 : EOR_direct_page_indexed_x,
@ -1174,6 +1183,25 @@ var EOR_direct_page_indirect = {
}
};
var EOR_direct_page_indirect_indexed_y = {
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) + cpu.r.y;
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);
var high_byte = cpu.mmu.read_byte(absolute_location+1);
EOR_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var EOR_absolute_indexed_x = {
bytes_required:function() {
return 3;
@ -1283,6 +1311,25 @@ var ORA_direct_page_indirect = {
}
};
var ORA_direct_page_indirect_indexed_y = {
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) + cpu.r.y;
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);
var high_byte = cpu.mmu.read_byte(absolute_location+1);
ORA_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var ORA_absolute_indexed_x = {
bytes_required:function() {
return 3;
@ -1392,6 +1439,25 @@ var AND_direct_page_indirect = {
}
};
var AND_direct_page_indirect_indexed_y = {
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) + cpu.r.y;
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);
var high_byte = cpu.mmu.read_byte(absolute_location+1);
AND_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var AND_absolute_indexed_x = {
bytes_required:function() {
return 3;
@ -1620,6 +1686,44 @@ var CMP_direct_page = {
}
};
var CMP_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) {
CMP_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);
CMP_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var CMP_direct_page_indirect_indexed_y = {
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) + cpu.r.y;
if(cpu.p.e|cpu.p.m) {
CMP_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);
CMP_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var CMP_absolute = {
bytes_required:function() {
return 3;
@ -1744,6 +1848,25 @@ var SBC_direct_page_indirect = {
}
};
var SBC_direct_page_indirect_indexed_y = {
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) + cpu.r.y;
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_absolute_indexed_x = {
bytes_required:function() {
return 3;
@ -1905,6 +2028,25 @@ var ADC_direct_page_indirect = {
}
};
var ADC_direct_page_indirect_indexed_y = {
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) + cpu.r.y;
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);
var high_byte = cpu.mmu.read_byte(absolute_location+1);
ADC_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var ADC_absolute_indexed_x = {
bytes_required:function() {
return 3;
@ -2468,6 +2610,28 @@ var STA_direct_page_indirect = {
}
};
var STA_direct_page_indirect_indexed_y = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
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);
cpu.mmu.store_byte((high_byte_loc<<8) | low_byte_loc, cpu.r.a);
} else {
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 low_byte = cpu.r.a & 0x00ff;
var high_byte = cpu.r.a >> 8;
cpu.mmu.store_byte(absolute_location, low_byte);
cpu.mmu.store_byte(absolute_location+1, high_byte);
}
}
};
var LDA_direct_page_indirect = {
bytes_required:function() {
return 2;
@ -2496,6 +2660,35 @@ var LDA_direct_page_indirect = {
}
};
var LDA_direct_page_indirect_indexed_y = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
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;
cpu.r.a = cpu.mmu.read_byte(absolute_location);
cpu.p.n = cpu.r.a >> 7;
} else {
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 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;
cpu.p.n = cpu.r.a >> 15;
}
if(cpu.r.a===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
}
};
var LDA_direct_page_indexed_x = {
bytes_required:function() {
return 2;