Isa Expansion Bus Connectors; Isa Expansion Slot Pin Assignments - NEC SP B-Series Service And Reference Manual

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.
Pin Direction
A1 Input
A2 Input/Output
A3 Input/Output
A4 Input/Output
A5 Input/Output
A6 Input/Output
A7 Input/Output
A8 Input/Output
A9 Input/Output
A10 Input
A11 Output
A12 Input/Output
A13 Input/Output
A14 Input/Output
A15 Input/Output
A16 Input/Output
A17 Input/Output
A18 Input/Output
A19 Input/Output
A20 Input/Output
A21 Input/Output
A22 Input/Output
A23 Input/Output
A24 Input/Output
A25 Input/Output
A26 Input/Output
A27 Input/Output

ISA Expansion Slot Pin Assignments

Signal Pin
IOCHCK# B1
SD7 B2
SD6 B3
SD5 B4
SD4 B5
SD3 B6
SD2 B7
SD1 B8
SD0 B9
IOCHRDY B10
AEN B11
SA19 B12
SA18 B13
SA17 B14
SA16 B15
SA15 B16
SA14 B17
SA13 B18
SA12 B19
SA11 B20
SA10 B21
SA9 B22
SA8 B23
SA7 B24
SA6 B25
SA5 B26
SA4 B27
Direction
Ground
Reset
Power
Input
Power
Input
Power
Input
Power
Ground
Output
Output
Input/Output
Input/Output
Output
Input
Output
Input
Input/Output
Output
Input
Input
Input
Input
Input
Output
Output
Connector Pin Assignments B-13
Signal
Ground
RESET
(RESDRV)
+5V
IRQ9
-5V
DRQ2
-12V
SRDY#
(N0WS#)
+12V
Ground
SMEMW#
(SMWTC#)
SMEMR#
(SMRDC#)
IOW# (IOWC#)
IOR# (IORC#)
DACK3#
DRQ3
DACK1
DRQ1
REFRESH#
BCLK
IRQ7
IRQ6
IRQ5
IRQ4
IRQ3
DACK2#
TC