Serial Mouse

Serial mouses won't work with 5V power and TTL and you will have to use RS-232 driver like MAX232.

TMK converter

• https://github.com/tmk/tmk_keyboard/tree/master/converter/serial_mouse

tested with Microsoft Green-eyed Mouse(DB-25) and Dell serial mouse(FCCID:DZLMMB14 DE-9).

Serial mouse protocol

• https://web.archive.org/web/20130307230349/www.kryslix.com/nsfaq/Q.12.html
• https://roborooter.com/post/serial-mice/

Microsoft

1200bps, 7 databits, 1 stop-bit, 3 byte packet

Mousesystems

1200bps, 8 databits, 1 stop-bit, 5 byte packet

Sun mouse

1200 buard, 1-Start bit, 8-Data bits, No-Parity, 1-Stop bit

https://github.com/tmk/tmk_keyboard/wiki/Sun-Keyboard-Protocol#mouse-protocol