Denial

Thanks for the replies. I got a replacement VIC and all is well now. Now on to my next projects - why does this VIC's space bar not work even after servicing (suspecting bad trace at this point - swapped the rubber domes around and cleaned all contacts and all keys working apart from space), and a d...

Actually I got the above completely wrong, it's actually 2 and 4 that are mute. The full output chart is: 15 1111 14 1110 13 1101 12 1100 slightly quieter than 11 11 1011 10 1010 slightly quieter than 9 9 1001 8 1000 7 0111 6 0110 much quieter than 7 5 0101 4 0100 dead 3 0011 2 0010 dead 1 0001 Over...

I'm thinking the solution for this would be to create a 9VAC signal from the 5V input. This is certainly possible but the way of producing such a thing that works reliably isn't immediately obvious to me. I do intend to look into it though. How would these machines respond to a square or triangle wa...

I've seen this fault with a cheap LCD TV, tweaking the VIC video gain sorted on that but the setting that TV needed caused a dim image on other TVs. A Toshiba MSX was causing the same issue (and an issue 2 Spectrum was displaying yellow on this specific set as well) so it looks like different ways T...

I just bought a new VIC chip for a used VIC20 with black screen (but otherwise working - tape working, responding to keyboard) fault. This works but I've found that there's a volume fault on this rig. Setting volume 36878 with bit 0 set but bit 3 not set (ie volume 1, 3, 5, 7) results in muted sound...