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Re: The strange case of the Commodore 64 colour bands.
Posted: Thu May 12, 2022 9:20 pm
by rubber_jonnie
exxos wrote: ↑Thu May 12, 2022 8:56 pm
stephen_usher wrote: ↑Thu May 12, 2022 8:52 pm
I don't know of any retail electronic component shops any more, with both Maplin and Tandy gone.
I think there's a few like rapid, ESR, Cricklewood etc...dotted about but only odd shops.
Rapid is up the road from me, but I haven't really used them. Cricklewood are great though. I miss Tandy and Maplin though.
I have found a few regular suppliers on ebay who supply good parts though.
Re: The strange case of the Commodore 64 colour bands.
Posted: Thu May 12, 2022 9:35 pm
by stephen_usher
Retroleum have been good, but there's still effectively a 2 day turn around from when I discover I need something and when it arrives.
Re: The strange case of the Commodore 64 colour bands.
Posted: Mon May 16, 2022 1:39 pm
by stephen_usher
The last chip, the MC4044P, has now arrived, so I can try that this evening after I've cleared away the STFM+TF
Re: The strange case of the Commodore 64 colour bands.
Posted: Mon May 16, 2022 1:47 pm
by rubber_jonnie
stephen_usher wrote: ↑Mon May 16, 2022 1:39 pm
The last chip, the MC4044P, has now arrived, so I can try that this evening after I've cleared away the STFM+TF
I have everything crossed!!!
Re: The strange case of the Commodore 64 colour bands.
Posted: Mon May 16, 2022 1:54 pm
by mrbombermillzy
...and I'm going to make the last crossed fingers EVER before I lose my marbles over this...
Re: The strange case of the Commodore 64 colour bands.
Posted: Mon May 16, 2022 3:06 pm
by stephen_usher
Well, if this doesn't work then I give up and live with the banding.
Re: The strange case of the Commodore 64 colour bands.
Posted: Mon May 16, 2022 5:54 pm
by stephen_usher
The last chip changed and... no change.
So, it must be intrinsic to this version of the board as the only things left are the resistors and ceramic capacitors.
There must be a trace which has a resonance with a harmic frequency of the video circuit somethere.
Re: The strange case of the Commodore 64 colour bands.
Posted: Mon May 16, 2022 7:14 pm
by mrbombermillzy
Re: The strange case of the Commodore 64 colour bands.
Posted: Mon May 16, 2022 7:28 pm
by rubber_jonnie
stephen_usher wrote: ↑Mon May 16, 2022 5:54 pm
The last chip changed and... no change.
So, it must be intrinsic to this version of the board as the only things left are the resistors and ceramic capacitors.
There must be a trace which has a resonance with a harmic frequency of the video circuit somethere.
Oh crikey, that is annoying !!
I guess I'm with
@mrbombermillzy at this point!!
Re: The strange case of the Commodore 64 colour bands.
Posted: Mon May 16, 2022 7:35 pm
by stephen_usher
Yeah. I'm trying to join the Lemon 64 forum at the moment to see if there are any experts on there who know of fixes.
The trouble is that I think it requires a human to initiate the registration e-mail. You can't even search without being a member.