CONNECTORS
SERIAL PORT CONNECTOR
Serial port connector pin-out is as follows:
HEADER PIN
DSUB PIN
SIGNAL
FUNCTION
1
1
DCD
Handshake in
2
6
DSR
Handshake in
3
2
RXD
Data in
4
7
RTS
Handshake out
5
3
TXD
Data out
6
8
CTS
Handshake in
7
4
DTR
Handshake out
8
9
RI
Handshake in
9
5
GND
Signal ground
10
NC
+5V
+5V user power or key
PARALLEL PORT CONNECTOR
The 4C24 has a parallel printer port. The connector for the parallel port uses a 26 pin, 2mm header
to save space. An adapter widget is available from MESA that converts between the 1mm cable and
standard .050 flat cable. The 26 pin connector arrangement is such that when terminated with a
standard DB 25 connector, the parallel port pinout matches the IBM standard pinout
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4C24 CPU USER'S MANUAL
