6502/65816.js
1
0
Fork 0
mirror of https://github.com/pskupinski/65816.js.git synced 2024-06-02 02:41:32 +00:00
Code Issues Projects Releases Wiki Activity

make sure to add the direct page register to the location with the LSR direct page operation

Browse Source
This commit is contained in:
Preston Skupinski 2011-05-08 14:12:29 -04:00
parent e8e96e0164
commit 937dfdb7d8
1 changed files with 7 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
cpu.js
View File

@ -251,22 +251,23 @@ var LSR_direct_page = {
return 2;
},
execute:function(cpu, bytes) {
var location = bytes[0] + cpu.r.d;
var shiftee;
if(cpu.p.m) {
shiftee = cpu.mmu.ready_byte(bytes[0]);
shiftee = cpu.mmu.ready_byte(location);
cpu.p.c = shiftee & 0x0001;
shiftee = shiftee >> 1;
cpu.mmu.store_byte(bytes[0], shiftee);
cpu.mmu.store_byte(location, shiftee);
} else {
var low_byte = cpu.mmu.read_byte(bytes[0]);
var high_byte = cpu.mmu.read_byte(bytes[0]+1);
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
shiftee = (high_byte<<8)|low_byte;
cpu.p.c = cpu.r.a & 0x01;
shiftee = shiftee >> 1;
low_byte = shiftee & 0x00ff;
high_byte = shiftee >> 8;
cpu.mmu.store_byte(bytes[0], low_byte);
cpu.mmu.store_byte(bytes[0]+1, high_byte);
cpu.mmu.store_byte(location, low_byte);
cpu.mmu.store_byte(location+1, high_byte);
}
cpu.p.n = 0;