Specifications
Table 2-25B. PC expansion
Bus
Connector, B1-B32 (J9)
PIN
SIGNAL
NAME
FUNCTION
INIOUT
11
GNO
GrOlnS
---
...
OUt
i3
+5y
....
•
;Jr-~-
r
...
~
SIgna,
+5
vol
ts
power
---
B4
IRQ2
Interrupt request 2
in
15
-5V
Fro.
J4
pin 9
B6
DRQ2
DNA
request 2
in
17
-12V
Fra.
J4
pin
10
B8
NIC
(no connection)
19
+12V
Fro.
J4
pin 8
110
GND
GrOlnS
---
111
-MEMW
Memory
Write out
112
-MEMR
Memory
Read
out
113
-row
I/O Write out
114
-lOR
I/O
Read
out
115
-DACa
DNA
Acknowledge
3 in
116
DRQ3
DNA
Request 3 out
117
-DACK1
DNA
Acknowledge
1 out
118
DRQ1
DNA
Request 1
in
119
-DACKO
Memory
Refresh out
120
CLOCK
7.16
MHz
clock.
out
121
IRQ7
Interrupt Request 7 in
122
IRQ6
Interrupt Request 6 in
123
IRgs
Interrupt Request 5 in
124
IRQ4
Interrupt Request 4 in
125
IRQ3
Interrupt Request 3 in
126
-OACK2
DNA
Acknowledge
2 out
127
TIC
DNA
Te,..inal
Count
out
128
ALE
Address Latch Enable
out
129
+$V
+5
vol
ts
power
---
830
OSC
14.31818
MHz
clock out
831
GNO
GrCUld
out
832
GND
GrCUld
out
2-30