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 A-13 provides the
pin assignments for the ISA expansion slots.
Table 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