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Re: Visi ON PCjr Mouse

PostPosted: Sun Aug 20, 2017 10:48 am
by Brutman
I just picked up an old SummaMouse recently - an optical mouse with a DB25 connector. It also has a wall-wart power adapter.

Many of the old mice required power supplies because they required too much power to just leech power from the RS232 pins. Another interesting bit of trivial .. RS232 voltages can range as high as 12 or 15 volts, positive and negative. (Many people assume that it's just TTL levels, which is 5v.)