FPU opcodes 0xd9 0xd8-0xdf, despite being undefined, do not throw an illegal instruction exception. Eradicator now works.

2013-08-24 15:11:30 +01:00 · 2013-08-24 15:11:30 +01:00 · af6d9474e6
commit af6d9474e6
parent 72f934d141
1 changed files with 4 additions and 0 deletions
--- a/src/x87.c
+++ b/src/x87.c
@ -414,6 +414,10 @@ void x87_d9()
                        if (fplog) pclog("FNOP\n");
                        cycles-=3;
                        return;
+                        case 0xD8: case 0xD9: case 0xDA: case 0xDB: /*Invalid, but apparently not illegal*/
+                        case 0xDC: case 0xDD: case 0xDE: case 0xDF:
+                        cycles-=3;
+                        return;
                        case 0xE0: /*FCHS*/
                        if (fplog) pclog("FCHS\n");
                        ST(0)=-ST(0);