ShuriZma
/
mgba
mirror of https://github.com/mgba-emu/mgba.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

LR35902: Mostly fix DAA

This commit is contained in:
Jeffrey Pfau 2016-01-21 00:59:59 -08:00
parent 6ab3bdcc46
commit a8b473870d
1 changed files with 16 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
src/lr35902/isa-lr35902.c
View File

@ -590,14 +590,23 @@ DEFINE_INSTRUCTION_LR35902(CPL_,
cpu->f.n = 1;)
DEFINE_INSTRUCTION_LR35902(DAA,
if ((cpu->a & 0xF) > 0x9 || cpu->f.h) {
cpu->a += 0x6;
}
if ((cpu->a & 0xF0) > 0x90 || cpu->f.c) {
cpu->a += 0x60;
cpu->f.c = 1;
if (cpu->f.n) {
if (cpu->f.h) {
cpu->a += 0xFA;
}
if (cpu->f.c) {
cpu->a += 0xA0;
}
} else {
cpu->f.c = 0;
if ((cpu->a & 0xF) > 0x9 || cpu->f.h) {
cpu->a += 0x6;
}
if ((cpu->a & 0xF0) > 0x90 || cpu->f.c) {
cpu->a += 0x60;
cpu->f.c = 1;
} else {
cpu->f.c = 0;
}
}
cpu->f.h = 0;
cpu->f.z = !cpu->a;)