Denial

My newly bought lumafix makes the vertical bars much more visible (it is supposed to reduce or remove them). Its three trimmers seem to have no effect on the picture. I have installed the lumafix on Breadbin C64 with a SCART (composite) cable. The Breadbin without the lumafix has slighly visible ver...

Hi! The "solder blob" is a real mess I did :-( It is just partially scratched traces that may look like a solder blob. I should have been more careful with the screwdriver... and use some plastic tool instead. This also caused one broken trace above, which I repaired with a bridge and the ...

The CPU sort of froze but the CPU is OK because I have swapped it with a good one. I can recheck. I have attached: - a photo of a bad fix for a 7406 with a slighly scratched line and a repaired one - Atlantis on a good Vic 20 with colored ships - Atlantis on the bad Vic 20 with missing and wrong col...

The specific graphical problem seems to occur in those games that seem to do some tricks with the raster and probably with the timings to get more colors such as: - Atlantis (ships have just one color instead of the many colors expected) - Daemon Attack (ships are not shown but the bottom is shown) ...

This is a CR PAL model with 2 6116 chips (2kbyte each) and 3 2114 chips (0.5kbyte each) including color ram Previous problems fixed This model had a loading issue which I fixed by swapping a faulty 7406 (UB4). By doing this I inadvertently cut one line which I repaired with a bridge. One more line w...

I have also swapped both VIAs with working ones and nothing changed. I confirm: - CPU OK (swapped) - both VIAs OK (swapped) - VIC-I OK (swapped) - PSU OK (works fine with all other VIC20s and C64s) Symptoms are: - Dig Dug frozen at startup with no sound and - Daemon Attack (main ship not shown) - Ba...

I fear it is something else because: - Dig Dug is not using any built-in characters and a failing character rom should not freeze such a game - RAM may be the issue but I cannot detect any corruption on the screen even if I re-map video memory to different locations (poke 648,x: sys 58648) - PSU is ...

Hi My description of the symptoms was not accurate. Vic-I is and CPU are OK because swapped with working and tested ones. Things are worse: some game cards do not work: - Dig Dug is stuck/frozen at start-up with no music - Deamon Attack seems to work but the main ship is not displayed. BUT most othe...

Hi

All cartridge games seem to work rock solid except the ones that require BASIC to start.

The Vic-I seems OK to me.

Hi One of my Vic 20s (C64 power plug) has the following problem: it freezes if IN BASIC mode after some time but it works rock solid if I use a cartridge. Once it freezes I sometimes get a white screen with visible borders and a restart is only possible after some time. Something is heating up too m...

Remark:
The two SN74HC02N are brand-new.
Both produce a black screen instead of the white screen.

Could this come from a different problem? Like a failing 6502?

I have tested with two different chips.
They produce a BLACK screen instead of the WHITE screen.

Are they pin to pin compatible?
Should I buy from a different seller/site?

Hi Summary: WHITE screen and VIC1 checked OK. I have bought 2 SN74HC02N (from the same seller). Are they pin-to-pin compatible with the 7402?? I have managed to cleanly remove the 7402, install a socket and SN74HC02N. With either SN74HC02N I get a BLACK screen (no sound, my SD2IEC lights up at start...

I have a serial IEC button for the C64, can I use it on my Vic/VC 20s? Can I use it for the purpose of testing the white screen issue? I have removed the (tested the working VIC1), cleaned the socket with (abundant) contact cleaner (KONTAKT 60) and I have resat the chip correctly into its socket. I ...

Is M53202P the standard name for the 7402 (MASTER CLOCK OSC) chip? I found the MASTER CLOCK OSC in Aliexpress but delivery from China takes ages. Therefore I am considering other options. Could anyone recommend any other shop? My choice was for http://store.retroleum.co.uk/ only has C64 and ZX Spect...