===== 09 DCR F20 DECODER READS | BIOS 19951204 System ROM Version 3.0 11/18/96 A
BadVaddr as the group starts: 00000480
Test 71h, 73h and 75h: the drive's decoder registers.
Switches (Test 21h, bit1 door open, bit0 head at POS0): int3 00 @106114. Getstat: int3 02 @29546. Mode 25. HINTMSK was 1F.
  19h 71 00: int3 9E @33485 gs3/02
  19h 71 01: int3 DC @29055 gs3/02
  19h 71 02: int3 00 @29101 gs3/02
  19h 71 03: int3 00 @29099 gs3/02
  19h 71 04: int3 00 @25882 gs3/02
  19h 71 05: int3 89 @29101 gs3/02
  19h 71 06: int3 C0 @29094 gs3/02
  19h 71 07: int3 02 @29154 gs3/02
  19h 71 08: int3 8A @42320 gs3/02
  19h 71 09: int3 C0 @29063 gs3/02
  19h 71 0A: int3 1C @37453 gs3/02
  19h 71 0B: int3 C9 @55157 gs3/02
  19h 71 0C: int3 08 @29106 gs3/02
  19h 71 0D: int3 30 @26021 gs3/02
  19h 71 0E: int3 6D @29142 gs3/02
  19h 71 0F: int3 05 @29154 gs3/02
  19h 71 10: int3 C0 @39575 gs3/02
  19h 71 11: int3 E0 @29058 gs3/02
  19h 71 12: int3 00 @29141 gs3/02
  19h 71 13: int3 19 @35528 gs3/02
  19h 71 14: int3 FF @40722 gs3/02
  19h 71 15: int3 C0 @42109 gs3/02
  19h 71 16: int3 C0 @40717 gs3/02
  19h 71 17: int3 C0 @25974 gs3/02
  19h 71 18: int3 C0 @92944 gs3/02
  19h 71 19: int3 C0 @29096 gs3/02
  19h 71 1A: int3 C0 @25837 gs3/02
  19h 71 1B: int3 C0 @88084 gs3/02
  19h 71 1C: int3 C0 @29100 gs3/02
  19h 71 1D: int3 C0 @25986 gs3/02
  19h 71 1E: int3 C0 @88357 gs3/02
  19h 71 1F: int3 C0 @29100 gs3/02
  19h 73 00 04: int3 8E DC 00 01 @231451 gs3/02
  19h 73 10 04: int3 C0 F0 00 19 @229260 gs3/02
  19h 75: int3 1C C9 08 30 @46444 gs3/02
Done.