CRG | Lets fix a Commodore VIC20 showing random colours @CRG | Uploaded October 2021 | Updated October 2024, 10 hours ago.
Its time to look at the colour fault in the VIC20 that was recently donated.

If you remember back to the mail call video when we tested this system is was showing incorrect text colours on screen but we also tried another VIC chip and it wasn't that.

Time to get under the hood and figure out exactly what is wrong with this little computer.

VIC20 diagnostic guide can be found here
web.archive.org/web/20210601074637/personalpages.tds.net/~rcarlsen/cbm/vic20/vic20.txt

VIC20 schematics can be found here
zimmers.net/anonftp/pub/cbm/schematics/computers/vic20/index.html