Appendix A. Connector Pin Assignments
Appendix A. Connector Pin Assignments
The following tables show the pin assignments for various system board connectors.
ISA Bus Connectors
A1
B1
A31
B31
C1
D1
C18
D18
Figure 2. ISA Bus Connector
The ISA bus connectors are located on the system board.
Table 36 (Page 1 of 2). Pin Assignments for the ISA Bus Connectors
Pin Signal Name I/O Pin Signal Name I/O
B1 Ground NA A1 IOCHCK# I
B2 RESET DRV O A2 SD7 I/O
B3 +5 V dc NA A3 SD6 I/O
B4 IRQ2/9 I A4 SD5 I/O
B5 −5 V dc NA A5 SD4 I/O
B6 DRQ2 I A6 SD3 I/O
B7 −12 V dc NA A7 SD2 I/O
B8 0WS# I A8 SD1 I/O
B9 +12 V dc NA A9 SD0 I/O
B10 Ground NA A10 IOCHRDY I
B11 SMEMW# O A11 AEN O
B12 SMEMR# O A12 SA19 I/O
B13 IOW# I/O A13 SA18 I/O
B14 IOR# I/O A14 SA17 I/O
B15 DACK3# O A15 SA16 I/O
B16 DRQ3 I A16 SA15 I/O
B17 DACK1# O A17 SA14 I/O
B18 DRQ1 I A18 SA13 I/O
B19 REFRESH# I/O A19 SA12 I/O
B20 CLK O A20 SA11 I/O
B21 IRQ7 I A21 SA10 I/O
B22 IRQ6 I A22 SA9 I/O
B23 IRQ5 I A23 SA8 I/O
B24 IRQ4 I A24 SA7 I/O
B25 IRQ3 I A25 SA6 I/O
B26 DACK2# O A26 SA5 I/O
B27 TC O A27 SA4 I/O
B28 BALE O A28 SA3 I/O
36 Copyright IBM Corp. 1997
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