===== 13 B31 F17 GPUSTAT BIT 31 | BIOS 19951204 System ROM Version 3.0 11/18/96 A
BadVaddr as the group starts: 00000480
GPUSTAT bit 31 against timer 1 counting hblanks (row 48, C:43): 600 pairs read back to
back (index:T1/bit 31 at each change), and its first 24 changes after an IRQ0.
640x240 (GP1(08h) 03h):
 11008 cycles: 0:732/0 114:733/0 231:734/0 349:735/0 467:736/0 584:737/0
 10976 cycles: 0:763/1 5:763/0 115:764/0 123:764/1 233:765/1 241:765/0 351:766/0 359:766/1 469:767/1 476:767/0 586:768/0 594:768/1
 10981 cycles: 0:806/0 5:806/1 115:807/1 123:807/0 233:808/0 241:808/1 351:809/1 358:809/0 468:810/0 476:810/1 586:811/1 594:811/0
 from an IRQ0 (bit 31 0 there), each change as cycles after it/T1/cycles since T1 moved: 51617/1015/80 53777/1016/158 55913/1017/80 58127/1018/158 60265/1019/158 62401/1020/158 64539/1021/158 66675/1022/80 68891/1023/158 71027/1024/158 73165/1025/158 75301/1026/158 77439/1027/80 79653/1028/158 81791/1029/158 83927/1030/158 86065/1031/158 88223/1032/158 90361/1033/80 92499/1034/80 94713/1035/158 96851/1036/158 98992/1037/163 101125/1038/80
 from an IRQ0 (bit 31 0 there), each change as cycles after it/T1/cycles since T1 moved: 51556/1278/80 53709/1279/85 55920/1280/158 58061/1281/163 60194/1282/158 62330/1283/80 64468/1284/80 66682/1285/158 68820/1286/158 70956/1287/158 73094/1288/80 75308/1289/158 77446/1290/158 79582/1291/158 81720/1292/158 83856/1293/80 85994/1294/80 88208/1295/158 90346/1296/158 92482/1297/158 94620/1298/80 96756/1299/80 98972/1300/158 101134/1301/158
640x480 interlaced (GP1(08h) 27h):
 10987 cycles: 0:405/0 115:406/0 232:407/0 350:408/0 468:409/0 586:410/0
 10986 cycles: 0:436/0 115:437/0 233:438/0 350:439/0 468:440/0 586:441/0
 10980 cycles: 0:467/0 115:468/0 233:469/0 351:470/0 468:471/0 586:472/0
 from an IRQ0 (bit 31 0 there), each change as cycles after it/T1/cycles since T1 moved: 49460/684/158 566104/924/184 1179566/1209/158
 from an IRQ0 (bit 31 0 there), each change as cycles after it/T1/cycles since T1 moved: 613434/1734/158 1130066/1974/158
Done.