6502
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65816.js
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added BCC, BCS, BEQ, BNE, BVC, BVS

This commit is contained in:
Preston Skupinski 2011-05-02 21:11:57 -04:00
parent ddbf51d8ef
commit 9795ea416b
1 changed files with 138 additions and 2 deletions
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140
cpu.js
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@ -76,7 +76,9 @@ function CPU_65816() {
0x74 : STZ_direct_page_indexed_x, 0x9b : TXY,
0xbb : TYX, 0xaa : TAX, 0xa8 : TAY, 0x8a : TXA,
0x98 : TYA, 0x4c : JMP_absolute,
0x6c : JMP_absolute_indirect, 0x80 : BRA };
0x6c : JMP_absolute_indirect, 0x80 : BRA,
0xf0 : BEQ, 0xd0 : BNE, 0x90 : BCC, 0xb0 : BCS,
0x50 : BVC, 0x70 : BVS };
}
var MMU = {
@ -116,6 +118,104 @@ var MMU = {
}
};
var BVC = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
if(!cpu.p.v) {
// Handle single byte two's complement numbers as the branch argument.
if(bytes[0]<=127) {
cpu.r.pc+=bytes[0];
} else {
cpu.r.pc-=256-bytes[0];
}
}
}
};
var BVS = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
if(cpu.p.v) {
// Handle single byte two's complement numbers as the branch argument.
if(bytes[0]<=127) {
cpu.r.pc+=bytes[0];
} else {
cpu.r.pc-=256-bytes[0];
}
}
}
};
var BCC = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
if(!cpu.p.c) {
// Handle single byte two's complement numbers as the branch argument.
if(bytes[0]<=127) {
cpu.r.pc+=bytes[0];
} else {
cpu.r.pc-=256-bytes[0];
}
}
}
};
var BCS = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
if(cpu.p.c) {
// Handle single byte two's complement numbers as the branch argument.
if(bytes[0]<=127) {
cpu.r.pc+=bytes[0];
} else {
cpu.r.pc-=256-bytes[0];
}
}
}
};
var BEQ = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
if(cpu.p.z) {
// Handle single byte two's complement numbers as the branch argument.
if(bytes[0]<=127) {
cpu.r.pc+=bytes[0];
} else {
cpu.r.pc-=256-bytes[0];
}
}
}
};
var BNE = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
if(!cpu.p.z) {
// Handle single byte two's complement numbers as the branch argument.
if(bytes[0]<=127) {
cpu.r.pc+=bytes[0];
} else {
cpu.r.pc-=256-bytes[0];
}
}
}
};
var BRA = {
bytes_required:function() {
return 2;
@ -401,6 +501,8 @@ var LDA_direct_page_indirect = {
}
if(cpu.r.a===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
// TODO: set the n bit of the p status register
}
@ -432,6 +534,8 @@ var LDA_direct_page_indexed_x = {
}
if(cpu.r.a===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
// TODO: Set the n status bit of the p status register.
}
@ -452,6 +556,8 @@ var LDA_absolute_indexed_y = {
}
if(cpu.r.a===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
// TODO: Set the n status bit of the p status register.
}
@ -472,6 +578,8 @@ var LDA_absolute_indexed_x = {
}
if(cpu.r.a===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
// TODO: Set the n status bit of the p status register.
}
@ -499,7 +607,9 @@ var LDY_const = {
}
if(cpu.r.y===0) {
cpu.p.z = 1;
}
} else {
cpu.p.z = 0;
}
// TODO: set n bit in p status register
}
};
@ -519,6 +629,8 @@ var LDY_absolute_indexed_x = {
}
if(cpu.r.y===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
// TODO: set n bit in the p status register
}
@ -550,6 +662,8 @@ var LDY_direct_page_indexed_x = {
}
if(cpu.r.a===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
// TODO: Set the n status bit of the p status register.
}
@ -570,6 +684,8 @@ var LDY_absolute = {
}
if(cpu.r.y===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
// TODO: set n bit in the p status register
}
@ -590,6 +706,8 @@ var LDY_direct_page = {
}
if(cpu.r.a===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
// TODO: Set the n status bit of the p status register.
}
@ -603,6 +721,8 @@ var INX = {
cpu.r.x++;
if(cpu.r.x===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
// TODO: set n bit of p status register
}
@ -616,6 +736,8 @@ var INY = {
cpu.r.y++;
if(cpu.r.y===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
// TODO: set n bit of p status register
}
@ -629,6 +751,8 @@ var INC_accumulator = {
cpu.r.a++;
if(cpu.r.a===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
// TODO: Set n bit of the p status register.
}
@ -656,6 +780,8 @@ var INC_absolute = {
}
if(temp===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
// TODO: Set n bit of the p status register.
}
@ -683,6 +809,8 @@ var INC_direct_page = {
}
if(temp===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
// TODO: Set n bit of the p status register.
}
@ -992,6 +1120,8 @@ var LDA_direct_page = {
}
if(cpu.r.a===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
// TODO: Set the n status bit of the p status register.
}
@ -1052,6 +1182,8 @@ var LDA_absolute_long = {
}
if(cpu.r.a===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
// TODO: Set the n status bit of the p status register.
}
@ -1072,6 +1204,8 @@ var LDA_absolute = {
}
if(cpu.r.a===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
// TODO: Set the n status bit of the p status register.
}
@ -1093,6 +1227,8 @@ var LDA_const = {
}
if(cpu.r.a===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
// TODO: Set the n bit in the status register(p).
}