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65816.js
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use cpu_lib.addressing.Absolute_indexed_x for LDY_absolute_indexed_x

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Preston Skupinski 2011-12-31 19:41:24 -05:00
parent e6ce09016f
commit e1f827b446
1 changed files with 3 additions and 26 deletions
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29
cpu.js
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@ -2969,34 +2969,11 @@ var LDY_const = {
}
};
var LDY_absolute_indexed_x = {
bytes_required:function() {
return 3;
},
execute:function(cpu, bytes) {
cpu.cycle_count+=4;
var original_location = (bytes[1]<<8)|bytes[0],
memory_location = original_location + cpu.r.x;
if((original_location&0xff00)!==(memory_location&0xff00))
cpu.cycle_count++;
if(cpu.p.e||cpu.p.x) {
cpu.r.y = cpu.mmu.read_byte(memory_location);
cpu.p.n = cpu.r.y >> 7;
} else {
cpu.cycle_count++;
cpu.r.y = cpu.mmu.read_word(memory_location);
cpu.p.n = cpu.r.y >> 15;
}
cpu_lib.r.p.check_z(cpu, cpu.r.y);
}
};
var LDY_absolute = new cpu_lib.addressing.Absolute(LDY_const);
var LDY_absolute_indexed_x =
new cpu_lib.addressing.Absolute_indexed_x(LDY_absolute);
var LDY_direct_page = new cpu_lib.addressing.Direct_page(LDY_const);
var LDY_direct_page_indexed_x =