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I haven't open my C128 to

I haven't open my C128 to look and verify this, but according to the schematics I have, Pin 3 of the User port (Reset) is connected to a line /EXTRES.  This line has a pasive pull-up and is "driven" by 7407 (pin 10 of U57) which is open-collector... and the only place the line goes is to the serial bus.  So grounding /RES on the user port should reset all disk drives (printers, etc.), but that is all.
The "real" internal /RES can be found on the corresponding pin 11 of U57.  Maybe this is closer for you?


I'm kupo for Kupo nuts!

Two reset lines, that makes

Two reset lines, that makes sense.
I'll have to give U57 a try, it does look closer.
Thanks.

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