IBM AT 5170 Technical Reference page 45

I/O Pin
Signal Name
B 1
GND
B2
RESET DRV
B3 +5 Vdc
B4
IRQ 9
B5
-5 Vdc
B6
DRQ2
B7 -12 Vdc
B8
OWS
B9 +12 Vdc
Bl0
GND
B11 -SMEMW
B12 -SMEMR
B13
-lOW
B14
-lOR
B15 -DACK3
B16
DRQ.3
B17 -DACK1
B18
DRQl
B19 -REFRESH
B20 ClK
B21
IRQ7
B22
IRQ6
B23
IRQ5
B24
IRQ4
B25
IRQ3
B26
-DACK2
B27 T/C
B28
BALE
B29 +5Vdc
B30 OSC
B31 GND
I/O
Ground
0
Power
I
Power
I
Power
I
Power
Ground
0
0
I/O
I/O
0
I
0
I
I/O
0
I
I
I
I
I
0
0
0
Power
0
Ground
I/O Channel IB-Side, J1 through J8)
System
Board 1-29