Reply 20 of 22, by scorp

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max232 draws a lot together with the mouse it could be too much. But currently it is not my problem. The problem is, that RTS is at -12V and toggles very shortly to +12V and back to -12V in that period I have to initialize the MCU and finalize serial initialization to get the mouse driver to eventually flip the voltage back to 12V again. It's a bit more complicated, than looks like at the first glance. I don't want to tell anything wrong now, but I'm in it and will report as soon as I got more info.

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Reply 21 of 22, by Deksor

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I see. Good luck with that ^^

By the way in the link I sent, that person made a small comparison list with several drivers (including the MAX232) and apparently there's a chip named "1488" that draws less current

Trying to identify old hardware ? Visit Ultimate Hardware 2019 - Project's thread The Ultimate Hardware 2019 (UH19) project- a stason.org/TH99