===== 03 SPD F20 SECTOR PERIOD | BIOS 19951204 System ROM Version 3.0 11/18/96 A
BadVaddr as the group starts: 00000480
The sector period: 200 INT1s of ReadN at single and double speed.
Switches (Test 21h, bit1 door open, bit0 head at POS0): int3 00 @90754. Getstat: int3 02 @29596. Mode 20. HINTMSK was 1F.
Single speed, mode 00, from sector 16: ReadN int5 03 ..(2) @44192, 0 INT1
  INT1 at:
  Pause: int3 02 @25199 int2 02 @33007
Double speed, mode 80, from sector 16: ReadN int5 03 ..(2) @32627, 0 INT1
  INT1 at:
  Pause: int3 02 @59872 int2 02 @67680
Single speed at sector 50000, mode 00, from sector 50000: ReadN int5 03 ..(2) @102623, 0 INT1
  INT1 at:
  Pause: int3 02 @28031 int2 02 @35839
Mode 00 put back to 20: int3 02 @43418
Done.