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Chapter 9 I/O Ports and Connectors
ISA Connectors
The system board ISA connectors follow the standard pinout given in the
ISA Specification.
Pin Signal Pin Signal Pin Signal Pin Signal
A1 IOCHK_L B1 GND C1 SBHE_L D1 MEMCS16_L
A2 SD7 B2 RSTDRV C2 LA23 D2 IOCS16_L
A3 SD6 B3 +5 V dc C3 LA22 D3 IRQ10
A4 SD5 B4 IRQ9 C4 LA21 D4 IRQ11
A5 SD4 B5 -5 V dc C5 LA20 D5 IRQ12
A6 SD3 B6 DRQ2 C6 LA19 D6 IRQ15
A7 SD2 B7 -12 V dc C7 LA18 D7 IRQ14
A8 SD1 B8 SRDY_L C8 LA17 D8 DACK0_L
A9 SD0 B9 +12 V dc C9 MEMR_L D9 DRQ0
A10 IOCHRDY B10 GND C10 MEMW_L D10 DACK5_L
A11 AEN B11 SMEMW_L C11 SD8 D11 DRQ5
A12 SA19 B12 SMEMR_L C12 SD9 D12 DACK6_L
A13 SA18 B13 IOW_L C13 SD10 D13 DRQ6
A14 SA17 B14 IOR_L C14 SD11 D14 DACK7_L
A15 SA16 B15 DACK3_L C15 SD12 D15 DRQ7
A16 SA15 B16 DRQ3 C16 SD13 D16 +5 V dc
A17 SA14 B17 DACK1_L C17 SD14 D17 Master16_L
A18 SA13 B18 DRQ1 C18 SD15 D18 GND
A19 SA12 B19 REFRESH_L
A20 SA11 B20 SYSCLK
A21 SA10 B21 IRQ7
A22 SA9 B22 IRQ6
A23 SA8 B23 IRQ5
A24 SA7 B24 IRQ4
A25 SA6 B25 IRQ3
A26 SA5 B26 DACK2_L
A27 SA4 B27 TC
A28 SA3 B28 BALE
A29 SA2 B29 +5 V dc
A30 SA1 B30 +OSC
A31 SA0 B31 GND