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65816.js
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added TCS and TSC

This commit is contained in:
Preston Skupinski 2011-05-13 12:46:35 -04:00
parent 8500c21618
commit 0fd6d30fe3
1 changed files with 46 additions and 1 deletions
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47
cpu.js
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@ -76,7 +76,8 @@ function CPU_65816() {
0x9e : STZ_absolute_indexed_x,
0x74 : STZ_direct_page_indexed_x, 0x9b : TXY,
0xbb : TYX, 0xaa : TAX, 0xa8 : TAY, 0x8a : TXA,
0x98 : TYA, 0x5b : TCD, 0x7b : TDC, 0x4c : JMP_absolute,
0x98 : TYA, 0x5b : TCD, 0x7b : TDC, 0x1b : TCS,
0x3b : TSC, 0x4c : JMP_absolute,
0x6c : JMP_absolute_indirect, 0x80 : BRA, 0x82 : BRL,
0xf0 : BEQ, 0xd0 : BNE, 0x90 : BCC, 0xb0 : BCS,
0x50 : BVC, 0x70 : BVS, 0x10 : BPL, 0x30 : BMI,
@ -2330,6 +2331,50 @@ var TDC = {
}
};
var TCS = {
bytes_required:function() {
return 1;
},
execute:function(cpu) {
if(cpu.p.e|!cpu.p.m) {
cpu.r.s = cpu.r.a;
} else {
cpu.r.s = (cpu.r.b<<8)|cpu.r.a;
}
}
};
var TSC = {
bytes_required:function() {
return 1;
},
execute:function(cpu) {
if(cpu.p.e) {
cpu.r.b = 1;
cpu.r.a = cpu.r.s;
// TODO: Figure out if in emulation mode the z and n bits should always
// be set to zero here as a 1 is transferred to b.
cpu.p.n = 0;
cpu.p.z = 0;
} else {
if(cpu.p.m) {
cpu.r.a = cpu.r.s & 0xff;
cpu.r.b = cpu.r.s >> 8;
cpu.p.n = cpu.r.b >> 7;
} else {
cpu.r.a = cpu.r.s;
cpu.p.n = cpu.r.a >> 15;
}
if(cpu.r.s===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
}
}
};
var STZ_absolute = {
bytes_required: function() {
return 3;