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/vid_svga.c

@@ -1116,7 +1116,7 @@ uint8_t svga_read_linear(uint32_t addr, void *p)
 
 void svga_doblit(int y1, int y2, int wx, int wy, svga_t *svga)
 {
-        pclog("svga_doblit start\n");
+//        pclog("svga_doblit start\n");
         svga->frames++;
 //        pclog("doblit %i %i\n", y1, y2);
         if (y1 > y2) 
@@ -1141,7 +1141,7 @@ void svga_doblit(int y1, int y2, int wx, int wy, svga_t *svga)
         }
         video_blit_memtoscreen(32, 0, y1, y2, xsize, ysize);
         if (readflash) rectfill(screen,winsizex-40,8,winsizex-8,14,0xFFFFFFFF);      
-        pclog("svga_doblit end\n");
+//        pclog("svga_doblit end\n");
 }
 
 void svga_writew(uint32_t addr, uint16_t val, void *p)