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Keyboard Connector Pin Assignments
Pin no.
Signal name
Direction Description
1
KBD CLK
I/O
Keyboard clock
2
KBD DATA
l/O
Keyboard data
3
-KBD RESET
O
-Keyboard reset
4
GND
—
Ground
5
+5V
—
Power
6-8
NC
—
No connection
Parallel Port Loop-back Connector Pin Assignments
Signal name
Pin no.
Pin no.
Signal name
Strobe
1
—
13
Select
Data bit 0
2
—
15
Error
Auto feed
14
—
12
P.END (out of
paper)
Init. printer
16
—
10
Acknowledge
Select input
17
—
11
Busy
(Output signal)
(Input signal)
Serial Port Loop-back Connector Pin Assignments
Signal name
Pin no. Pin no.
Signal name
Transmit data
2 — 3
Receive data
Request to send 4 — 5
Clear to send
Data terminal ready 20 — 6
Data set ready
(Output signal)
(Input signal)
Specifications B-9