IBM 2274 - Manual (Page 163)

Parts/Test Point Locations 129
Diskette Drive Cable Connector Signals
Pin
Signal
Name
I/O Pin
Signal
Name
I/O
1 Ground 18 Direction 0
2 Density
Select
O 19 Ground
3 No
Connection 20 Step O
4 No
Connection 21 Ground
5 Ground 22 Write Data O
6 No
Connection 23 Ground
7 Ground 24 Write Enable O
8 Index I 25 Ground
9 Ground 26 Track 0I 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