C64 vertical lines and blank spaces.
Posted: Mon Aug 06, 2018 6:23 pm
I have a c64 that isnt working. It goes through a few different garbled screen but always ends up at this one. The power supply is good and getting te right voltages.
Ray Carlson's C64 diagnostics pages may help.
http://personalpages.tds.net/~rcarlsen/ ... 64c-ic.txt
So, maybe try swapping the CIAs (if socketed) and seeing if the screen changes. If so, then you'll need a new CIA.