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65816.js
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added PHD and PLD

This commit is contained in:
Preston Skupinski 2011-05-09 00:56:00 -04:00
parent 81767302e4
commit 8d68d281c7
1 changed files with 42 additions and 1 deletions
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43
cpu.js
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@ -125,7 +125,8 @@ function CPU_65816() {
0x76 : ROR_direct_page_indexed_x,
0x48 : PHA, 0x68 : PLA, 0x5a : PHY, 0x7a : PLY,
0xda : PHX, 0xfa : PLX, 0x08 : PHP, 0x28 : PLP,
0xf4 : PEA, 0xd4 : PEI, 0x8b : PHB, 0xab : PLB };
0xf4 : PEA, 0xd4 : PEI, 0x8b : PHB, 0xab : PLB,
0x4b : PHK, 0x0b : PHD, 0x2b : PLD };
/**
* Take a raw hex string representing the program and execute it.
@ -204,6 +205,46 @@ var MMU = {
}
};
var PHK = {
bytes_required:function() {
return 1;
},
execute:function(cpu) {
cpu.mmu.store_byte(cpu.r.s--, cpu.r.pbr);
}
};
var PHD = {
bytes_required:function() {
return 1;
},
execute:function(cpu) {
var low_byte = cpu.r.d & 0x00ff;
var high_byte = cpu.r.d >> 8;
cpu.mmu.store_byte(cpu.r.s--, high_byte);
cpu.mmu.store_byte(cpu.r.s--, low_byte);
}
};
var PLD = {
bytes_required:function() {
return 1;
},
execute:function(cpu) {
var low_byte = cpu.mmu.read_byte(++cpu.r.s);
var high_byte = cpu.mmu.read_byte(++cpu.r.s);
cpu.r.d = (high_byte<<8)|low_byte;
cpu.p.n = cpu.r.d >> 15;
if(cpu.r.d===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
}
};
var PHB = {
bytes_required:function() {
return 1;