180 Appendix D: Technical reference
Serial port connector
The two serial port connectors are identical and are 9-pin,
D-SUB male connectors.
Mouse and keyboard connectors
The mouse and keyboard connectors are 6-pin, PS/2-style
female connectors.
Pin Signal I/O Description
1CDI
Carrier Detect
2 RXD I
Receive Data
3 TXD O
Transmit Data
4DTRO
Data Terminal Ready
5GND-
Ground
6DSRI
Data Set Ready
7RTSO
Request to Send
8CTSI
Clear to Send
9RII
Ring Indicator
Pin Signal I/O Description
1 DATA I/O
Key Data
2NC-
Not connected
3GND-
Ground
4VCCO
Power, +5 VDC
5 CLK O
Clock
6NC-
Not connected
1
5
6
9
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