PMAC-PC Hardware Reference
PMAC-PCI Base Board Connector Pinouts
45
J3: Multiplexer Port Connector
J3 JTHW (26-Pin Connector)
Front View
Pin #
Symbol
Function
Description
Notes
1
GND
Common
PMAC Common
2
GND
Common
PMAC Common
3
DAT0
Input
Data-0 Input
Data input from multiplexed accessory
4
SEL0
Output
Select-0 Output
Multiplexer select output
5
DAT1
Input
Data-1 Input
Data input from multiplexed accessory
6
SEL1
Output
Select-1 Output
Multiplexer select output
7
DAT2
Input
Data-2 Input
Data input from multiplexed accessory
8
SEL2
Output
Select-2 Output
Multiplexer select output
9
DAT3
Input
Data-3 Input
Data input from multiplexed accessory
10
SEL3
Output
Select-3 Output
Multiplexer select output
11
DAT4
Input
Data-4 Input
Data input from multiplexed accessory
12
SEL4
Output
Select-4 Output
Multiplexer select output
13
DAT5
Input
Data-5 Input
Data input from multiplexed accessory
14
SEL5
Output
Select-5 Output
Multiplexer select output
15
DAT6
Input
Data-6 Input
Data input from multiplexed accessory
16
SEL6
Output
Select-6 Output
Multiplexer select output
17
DAT7
Input
Data-7 Input
Data input from multiplexed accessory
18
SEL7
Output
Select-7 Output
Multiplexer select output
19
N.C.
N.C.
No Connection
20
GND
Common
PMAC Common
21
BRLD/
Output
Buffer Request
Low is Buffer Request
22
GND
Common
PMAC Common
23
IPLD/
Output
In Position
Low is In Position
24
GND
Common
PMAC Common
25
+5V
Output
+5VDC Supply
Power supply out
26
INIT/
Input
PMAC Reset
Low is reset
The JTHW multiplexer port provides eight inputs and eight outputs at TTL levels. While these I/O can be used in
un-multiplexed form for 16 discrete I/O points, most users will utilize PMAC software and accessories to use this
port in multiplexed form to greatly multiply the number of I/O that can be accessed on this port. In multiplexed
form, some of the SELn outputs are used to select which of the multiplexed I/O are to be accessed.
See also:
I/O and Memory Map Y:$FFC1
Suggested M-variables M40 - M58
M-variable formats TWB, TWD, TWR, TWS
Acc-8D Option 7, Acc-8D Option 9, Acc-18, Acc-34x, NC Control Panel
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