Keyboard, Mouse and other input devices cables and adapters scheme
Computer serial cable for the Kensington Expert Mouse trackball
computer serial port Pin
computer serial port Pin
Directionmouse Pin
mouse Pin
CD 1 <-- 5 CD Carrier Detect
RXD 2 <-- 4 RXD Receive Data
TXD 3 --> 7 TXD Transmit Data
DTR 4 --> 6 DTR Data Terminal Ready
GND 5 --- 2 GND Ground
DSR 6 --> 1 DSR Data Set Ready
RTS 7 <-- 3 RTS Request to send
CTS 8 <-- 8 CTS Clear to Send

Pin 9 on the 9pin d-sub is not connected.

9 pin D-SUB female connector layout
9 pin D-SUB female connector
at the computer serial port
8 pin mini-DIN male connector layout
8 pin mini-DIN male connector
at the mouse
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Kensington Expert Mouse serial cable visual pinout:
Kensington Expert Mouse serial cable diagram
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