===== 15 GRS GPU RESET | BIOS 19951204 System ROM Version 3.0 11/18/96 A
BadVaddr as the group starts: 00000480
GPU timing: GP1(00h) and GP1(01h) resets
Rect 1x1 8bpp, same CLUT: 156 151 155 154, bit 28 at 154
Rect 1x1 8bpp, same CLUT, GP1(01h) before: 154 155 151 156
A0h 64x16 cut after 100 words by GP1(01h): GPUSTAT before 10062518 after 10062518
 then fill 16x16: 277 271 272 266, bit 28 at 151
 pixel 0,256 0886 (the fill writes 0886h)
C0h 16x16, 1 word read, GP1(01h): GPUSTAT before 18062518 after 18062518, GPUREAD then 08860886
GP1(00h) idle: ready at 110, GPUSTAT 14802000
After GP1(00h), GP1(10h) 3,4,5: 00000000 00000000 00000000
GP1(00h) 3000 cycles into fill 1024x256: ready at 82, GPUSTAT 14802000, last pixel 001F (001F old, 03E0 new)
Fill 16x16 after: 290 269 272 271, bit 28 at 156
Done.