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Fixed some GB-Z80 instructions. Special thanks to Blargg and Dwedit.

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This commit is contained in:
dborth 2009-10-03 16:47:16 +00:00
parent fe4821550d
commit 3181fb22ad
1 changed files with 10 additions and 27 deletions
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37
source/vba/gb/gbCodes.h
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@ -208,9 +208,7 @@
case 0x27:
// DAA
tempRegister.W=AF.B.B1;
if(AF.B.B0&C_FLAG) tempRegister.W|=256;
if(AF.B.B0&H_FLAG) tempRegister.W|=512;
if(AF.B.B0&N_FLAG) tempRegister.W|=1024;
tempRegister.W|=(AF.B.B0&(C_FLAG|H_FLAG|N_FLAG))<<4;
AF.W=DAATable[tempRegister.W];
break;
case 0x28:
@ -1290,18 +1288,10 @@ case 0x38:
case 0xe8:
// ADD SP,NN
offset = (s8)gbReadOpcode(PC.W++);
if(offset >= 0) {
tempRegister.W = SP.W + offset;
AF.B.B0 = (SP.W > tempRegister.W ? C_FLAG : 0) |
((SP.W^offset^tempRegister.W)&0x1000? H_FLAG:0);
SP.W = tempRegister.W;
} else {
tempRegister.W = SP.W + offset;
AF.B.B0 = (SP.W < tempRegister.W ? C_FLAG : 0) |
((SP.W^offset^tempRegister.W)&0x1000?H_FLAG:0);
SP.W = tempRegister.W;
}
tempRegister.W = SP.W + offset;
AF.B.B0 = ((SP.W^offset^tempRegister.W)&0x100? C_FLAG : 0) |
((SP.W^offset^tempRegister.W)& 0x10? H_FLAG : 0);
SP.W = tempRegister.W;
break;
case 0xe9:
// LD PC,HL
@ -1340,7 +1330,7 @@ case 0x38:
break;
case 0xf1:
// POP AF
AF.B.B0=gbReadMemory(SP.W++);
AF.B.B0=gbReadMemory(SP.W++)&0xF0;
AF.B.B1=gbReadMemory(SP.W++);
break;
case 0xf2:
@ -1377,17 +1367,10 @@ case 0x38:
case 0xf8:
// LD HL,SP+NN
offset = (s8)gbReadOpcode(PC.W++);
if(offset >= 0) {
tempRegister.W = SP.W + offset;
AF.B.B0 = (SP.W > tempRegister.W ? C_FLAG : 0) |
((SP.W^offset^tempRegister.W)&0x1000? H_FLAG:0);
HL.W = tempRegister.W;
} else {
tempRegister.W = SP.W + offset;
AF.B.B0 = (SP.W < tempRegister.W ? C_FLAG : 0) |
((SP.W^offset^tempRegister.W)&0x1000?H_FLAG:0);
HL.W = tempRegister.W;
}
tempRegister.W = SP.W + offset;
AF.B.B0 = ((SP.W^offset^tempRegister.W)&0x100? C_FLAG : 0) |
((SP.W^offset^tempRegister.W)& 0x10? H_FLAG : 0);
HL.W = tempRegister.W;
break;
case 0xf9:
// LD SP,HL