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Power Cable Connector
Pin Signal Name Pin Signal Name
1 Power Good (+5 V dc) 7 Ground
2 +5 V dc 8 Ground
3 +12 V dc 9 −5 V dc
4 −12 V dc 10 +5 V dc
5 Ground 11 +5 V dc
6 Ground 12 +5 V dc
Power Cable Connector 3.3 V dc
Pin Signal Name Pin Signal Name
1 3.3 V dc 4 Ground
2 3.3 V dc 5 Ground
3 3.3 V dc 6 Ground
Diskette Cable Connector
Pin Signal Name I/O Pin Signal Name I/O
1 Ground 18 Direction O
2 Density Select O 19 Ground
3 No Connection 20 Step O
4 No Connection 21 Ground
5 Ground 22 Write Data I
6 No Connection 23 Ground
7 Ground 24 Write Enable O
8 Index I 25 Ground
9 Ground 26 Track 0 I
10 Motor Enable 0 O 27 Ground
11 Ground 28 Write Protect I
12 Drive Select 1 O 29 Ground
13 Ground 30 Read Data I
14 Drive Select 0 O 31 Ground
15 Ground 32 Select Head 1 O
16 Motor Enable 1 O 33 Ground
17 Ground 34 Diskette Change I
Note: The diskette drive signal cable for drive A has a twist for the Drive
Select and Motor Enable signals.
Parts/Test Point Locations 5-19