02 Low Current
04 Alternate I/O
06 Alternate I/O
08 Alternate I/O
10 Two Sided or Alternate I/O (Default)
12 Disk Change or Alternate I/O (Default)
14 Side Select (Default) or Alternate I/O
16 In Use or Alternate I/O (Default)
18 Head Load or Alternate I/O (Default)
20 Index
22 Ready
24 Alternate I/O
26 DS0
28 DS1
30 DS2
32 DS3
34 Direction
36 Step
38 Write Data
40 Write Gate
42 Track 00
44 Write Protect
46 Read Data
48 NC
50 NC