Mach64 changes :

- No longer crashes PCem when remapping (mostly seen when changing resolution in Windows)
- Added PCI registers
- Added LFB emulation (PCI only)
- Source pattern modes now work correctly
- Vsync flag now emulated correctly
- Scrolling in accelerator modes now works correctly

Also disabled some debug.

src/sis496.c

@@ -61,7 +61,7 @@ void sis496_recalcmapping(sis496_t *sis496)
 void sis496_write(int func, int addr, uint8_t val, void *p)
 {
         sis496_t *sis496 = (sis496_t *)p;
-pclog("sis496_write : addr=%02x val=%02x\n", addr, val);
+//pclog("sis496_write : addr=%02x val=%02x\n", addr, val);
         switch (addr)
         {
                 case 0x44: /*Shadow configure*/