A-14 Connector Pin Assignments
ISA Expansion Bus Connector Pin Assignments
The expansion slots signals, voltages, and grounds are supplied through the bus connectors.
There are no active components on the ISA/PCI-Bus backboard. Table Appendix A-13
provides the pin assignments for the ISA expansion slots.
Table Appendix A-13 ISA Expansion Slot Pin Assignments
Pin Direction Signal Pin Direction Signal
A1 Input IOCHCK B1 Ground GND
A2 Input/Output SD07 B2 Output RSET DRV
A3 Input/Output SD06 B3 Power +5V
A4 Input/Output SD05 B4 Input IRO09
A5 Input/Output SD04 B5 Power –5V
A6 Input/Output SD03 B6 Input DRQ2
A7 Input/Output SD02 B7 Power –12V
A8 Input/Output SD01 B8 Input 0WS
A9 Input/Output SD00 B9 Power +12V
A10 Input IOCHRDY B10 Ground GND
A11 Output AEN B11 Output SMEMWR
A12 Input/Output SA19 B12 Output SMEMRD
A13 Input/Output SA18 B13 Input/Output IORD
A14 Input/Output SA17 B14 Input/Output IOWR
A15 Input/Output SA16 B15 Output DACK3
A16 Input/Output SA15 B16 Input DRQ3
A17 Input/Output SA14 B17 Output DACK1
A18 Input/Output SA13 B18 Input DRQ1
A19 Input/Output SA12 B19 Input/Output REFRESH
A20 Input/Output SA11 B20 Output BCLK
A21 Input/Output SA10 B21 Input IRQ07
A22 Input/Output SA09 B22 Input IRQ06
A23 Input/Output SA08 B23 Input IRQ05
A24 Input/Output SA07 B24 Input IRQ04
A25 Input/Output SA06 B25 Input IRQ03
A26 Input/Output SA05 B26 Output DACK2
A27 Input/Output SA04 B27 Output T/C
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