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Re: Stuff and Things.
Posted: 07 Jun 2023 20:27
by rubber_jonnie
A big thank you to
@PhilC for the C64 breadbin model he kindly sold me, but not only that but his generous inclusion of some rather interesting PCBs for me to build 😁
PXL_20230607_185912364.jpg
Re: Stuff and Things.
Posted: 07 Jun 2023 21:13
by Icky
Uh-oh :)
Re: Stuff and Things.
Posted: 08 Jun 2023 10:54
by rubber_jonnie
Icky wrote: 07 Jun 2023 21:13Uh-oh :)
Yeah, I know...
Re: Stuff and Things.
Posted: 08 Jun 2023 10:57
by rubber_jonnie
@PhilC
I have to say the image quality on the C64 is fantastic, this is composite via my RetroTink to HDMI:
PXL_20230608_094528270.jpg
I need to test the keyboard and have a bit of a general clean, but it's already looking way better than the image from my C64 C.
Re: Stuff and Things.
Posted: 08 Jun 2023 11:04
by stephen_usher
Amazing! No chromatic jail bars!
Re: Stuff and Things.
Posted: 08 Jun 2023 11:10
by rubber_jonnie
stephen_usher wrote: 08 Jun 2023 11:04
Amazing! No chromatic jail bars!
It really is pretty impressive, clean as a whistle and I can dial up the brightness on the TV if I need to, but otherwise amazing.
BTW did you ever fix the jail bars on yours, I can't recall?
Re: Stuff and Things.
Posted: 08 Jun 2023 11:36
by stephen_usher
No, it seemed like it was just an artefact from that revision of board and VIC-II. It was slightly better in s-video.
The design of the PAL video circuitry is silly in that the chroma and luma aren't fully separated with the chroma feeding into the luma line via, from what I remember, a resistor. This is totally unlike the NTSC circuit which has them completely separate.
Re: Stuff and Things.
Posted: 08 Jun 2023 11:40
by PhilC
@rubber_jonnie yes it looked nice here on VGA. I did send you a pcb for a Lumafix board as well I believe but you might not need it?
Re: Stuff and Things.
Posted: 08 Jun 2023 11:49
by rubber_jonnie
stephen_usher wrote: 08 Jun 2023 11:36
No, it seemed like it was just an artefact from that revision of board and VIC-II. It was slightly better in s-video.
The design of the PAL video circuitry is silly in that the chroma and luma aren't fully separated with the chroma feeding into the luma line via, from what I remember, a resistor. This is totally unlike the NTSC circuit which has them completely separate.
I'm not very up on C64 board revisions, but this is the one I have here:
PXL_20230608_104645361.jpg
So not sure how closely it relates to yours. Interesting that it has no box around the VIC II.
Re: Stuff and Things.
Posted: 08 Jun 2023 11:54
by rubber_jonnie
PhilC wrote: 08 Jun 2023 11:40
@rubber_jonnie yes it looked nice here on VGA. I did send you a pcb for a Lumafix board as well I believe but you might not need it?
Honestly, I don't think the Lumafix will be needed, at least for now. Obviously I'll need to test some more, and I also need to put some heatsinks on the custom IC's I think too.