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/
65816.js
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added PHB and PLB

This commit is contained in:
Preston Skupinski 2011-05-09 00:34:19 -04:00
parent b956d2254f
commit aa08ce700d
1 changed files with 26 additions and 2 deletions
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28
cpu.js
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@ -123,9 +123,9 @@ function CPU_65816() {
0x6e : ROR_absolute, 0x66 : ROR_direct_page,
0x7e : ROR_absolute_indexed_x,
0x76 : ROR_direct_page_indexed_x,
0x48 : PHA , 0x68 : PLA, 0x5a : PHY, 0x7a : PLY,
0x48 : PHA, 0x68 : PLA, 0x5a : PHY, 0x7a : PLY,
0xda : PHX, 0xfa : PLX, 0x08 : PHP, 0x28 : PLP,
0xf4 : PEA, 0xd4 : PEI };
0xf4 : PEA, 0xd4 : PEI, 0x8b : PHB, 0xab : PLB };
/**
* Take a raw hex string representing the program and execute it.
@ -204,6 +204,30 @@ var MMU = {
}
};
var PHB = {
bytes_required:function() {
return 1;
},
execute:function(cpu) {
cpu.mmu.store_byte(cpu.r.s--, cpu.r.dbr);
}
};
var PLB = {
bytes_required:function() {
return 1;
},
execute:function(cpu) {
cpu.r.dbr = cpu.mmu.read_byte(++cpu.r.s);
cpu.p.n = cpu.r.dbr >> 7;
if(cpu.r.dbr===0) {
cpu.p.z = 1;
} else {
cpu.p.z = 0;
}
}
};
var PEA = {
bytes_required:function() {
return 3;