Connector Pin Assignments B-13
ISA Expansion Bus Connectors
The expansion slot signals, voltages, and grounds are supplied through the bus
connectors. The following table provides the pin assignments for the ISA
expansion bus.
ISA Expansion Slot Pin Assignments
Pin
Direction
Signal
Pin
Direction
Signal
A1
Input
IOCHCK#
B1
Ground
Ground
A2
Input/Output
SD7
B2
Reset
RESET
(RESDRV)
A3
Input/Output
SD6
B3
Power
+5V
A4
Input/Output
SD5
B4
Input
IRQ9
A5
Input/Output
SD4
B5
Power
-5V
A6
Input/Output
SD3
B6
Input
DRQ2
A7
Input/Output
SD2
B7
Power
-12V
A8
Input/Output
SD1
B8
Input
SRDY#
(N0WS#)
A9
Input/Output
SD0
B9
Power
+12V
A10
Input
IOCHRDY
B10
Ground
Ground
A11
Output
AEN
B11
Output
SMEMW#
(SMWTC#)
A12
Input/Output
SA19
B12
Output
SMEMR#
(SMRDC#)
A13
Input/Output
SA18
B13
Input/Output
IOW# (IOWC#)
A14
Input/Output
SA17
B14
Input/Output
IOR# (IORC#)
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
IRQ7
A22
Input/Output
SA9
B22
Input
IRQ6
A23
Input/Output
SA8
B23
Input
IRQ5
A24
Input/Output
SA7
B24
Input
IRQ4
A25
Input/Output
SA6
B25
Input
IRQ3
A26
Input/Output
SA5
B26
Output
DACK2#
A27
Input/Output
SA4
B27
Output
TC
Summary of Contents for DIRECTION SP B - SERVICE 1999
Page 23: ...2 Utilities BIOS Setup Utility Intel Processor Serial Number Control Utility ...
Page 67: ...4 Maintenance and Troubleshooting Maintenance Troubleshooting ...
Page 78: ...5 Disassembly and Reassembly Disassembly Illustrated Parts Breakdown ...
Page 118: ...C System Resources IRQ Settings System Resource Information Jumper Settings ...