Turbo PMAC2 Hardware Reference Manual
J2 (JTHW) Multiplexer Port Connector
J2/JTHW (26-Pin Header)
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 MUX port accessories
4
SEL0
OUTPUT
SELECT-0 Output
Address/data output for MUX port
accessories
5
DAT1
INPUT
DATA-1 Input
Data input from MUX port accessories
6
SEL1
OUTPUT
SELECT-1 Output
Address/data output for MUX port
accessories
7
DAT2
INPUT
DATA-2 Input
Data input from MUX port accessories
8
SEL2
OUTPUT
SELECT-2 Output
Address/data output for MUX port
accessories
9
DAT3
INPUT
DATA-3 Input
Data input from MUX port accessories
10
SEL3
OUTPUT
SELECT-3 Output
Address/data output for MUX port
accessories
11
DAT4
INPUT
DATA-4 Input
Data input from MUX port accessories
12
SEL4
OUTPUT
SELECT-4 Output
Address/data output for MUX port
accessories
13
DAT5
INPUT
DATA-5 Input
Data input from MUX port accessories
14
SEL5
OUTPUT SELECT-5
Output
Address/data output for MUX port
accessories
15 DAT6 INPUT
DATA-6
Input
Data input from MUX port accessories
16 SEL6
OUTPUT
SELECT-6 Output
Address/data output for MUX port
accessories
17 DAT7 INPUT
DATA-7
Input
Data input from MUX port accessories
18 SEL7
OUTPUT
SELECT-7 Output
Address/data output for MUX port
accessories
19
N.C.
N.C.
No Connection
20 GND COMMON
PMAC
Common
21
BRLD/
OUTPUT
Buffer Request
Low is "buffer req."
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 connector provides 8 inputs and 8 outputs at TTL levels; these are
typically used to create multiplexed I/O with accessory boards such as ACC-18 (Thumbwheel)
and ACC-34 (Discrete I/O). The port I/O may also be used directly, as non-multiplexed I/O.
14
Connector Pinouts
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