Input devices (keyboards, mices, joysticks)  > device-specific pinouts
motherboard PinPin
1 clock mouse clock
2 Vss ground
3 nc no connection
4 data mouse data
5 nc no connection
6 nc no connection
7 nc no connection
8 Vcc +5vdc

according to the data obtained from major source motherboard blogs ( on the El Pina / M-Compa / M571 main board...this is the correct pinout for connecting a PS/2 mouse w/ an adaptor.

8 pin DIN female connector layout
8 pin DIN female connector
at the motherboard
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M571 motherboard ps/2 mouse pinout visual pinout:
M571 motherboard ps/2 mouse pinout diagram
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