I learned that after buying an amiga mouse (didnt have the y problem, just didnt work period lol) and had a little mouse test program tell me it was an amiga mouse.
Then I bought two different versions of one of those Tom USB mouse/joystick adapters. Tried a dozen different usb mice, some wouldnt budge, some would have that no y axis problem.
Then finally I bought what was claimed to be a new old stock 1351 mouse. Fantastic shape, although it seemed to have been opened and taken out before I had my hands on it. No y axis, just like some of the usb adapted ones I tried.
So now I'm looking at the C64 machine itself. Well, when I get around to it. It has to get in line.
It is a defective CIA chip.
I have an older rev board C64 that I could swap that chip from, assuming they're interchangeable between revs. Will have to dig into those details. Thanks for the suggestion.
Yeah they are all the same, It is most likely socket U1. Also go down the line on the keyboard and try every key just for fun. Handy link
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