A-12 Connector Pin Assignments
ISA/PCI-Bus Backboard Connector Pin Assignments
Table Appendix A-12 provides the pin assignments for the ISA/PCI-Bus backboard con-
nector on the system board.
Table Appendix A-12 ISA/PCI-Bus Backboard Connector Pin Assignments
Pin Signal Pin Signal Pin Signal Pin Signal
A1 IOCHCK B1 GND E1 GND F1 GND
A2 SD07 B2 RSET DRV E2 GND F2 GND
A3 SD06 B3 +5V E3 –PCIINT1 F3 –PCIINT3
A4 SD05 B4 IRO09 E4 –PCIINT2 F4 –PCIINT4
A5 SD04 B5 –5V E5 +5V F5 +5V
A6 SD03 B6 DRQ2 E6 Key F6 Key
A7 SD02 B7 –12V E7 +5V F7 +5V
A8 SD01 B8 0WS E8 –PCIRST F8 PCLKF
A9 SD00 B9 +12V E9 –GNTO F9 GND
A10 IOCHRDY B10 GND E10 –REQ0 F10 –GNT1
A11 AEN B11 SMEMWR E11 GND F11 GND
A12 SA19 B12 SMEMRD E12 PCLKE F12 –REQ1
A13 SA18 B13 IORD E13 GND F13 AD31
A14 SA17 B14 IOWR E14 AD30 F14 AD29
A15 SA16 B15 DACK3 E15 +3.3V F15 +3.3V
A16 SA15 B16 DRQ3 E16 Key F16 Key
A17 SA14 B17 DACK1 E17 +3.3V F17 +3.3V
A18 SA13 B18 DRQ1 E18 AD28 F18 AD27
A19 SA12 B19 REFRESH E19 AD26 F19 AD25
A20 SA11 B20 BCLK E20 AD24 F20 –CBE3
A21 SA10 B21 IRQ07 E21 AD22 F21 AD23
A22 SA09 B22 IRQ06 E22 AD20 F22 AD21
A23 SA08 B23 IRQ05 E23 AD18 F23 AD19
A24 SA07 B24 IRQ04 E24 +3.3V F24 +3.3v
A25 SA06 B25 IRQ03 E25 Key F25 Key
A26 SA05 B26 DACK2 E26 +3.3V F26 +3.3V
A27 SA04 B27 T/C E27 AD16 F27 AD17
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