Hello,
Can you please post the link to Hans' archives?

I did make a board with the 6545 to the schematics of Elektor.
Most TTL Glue-logic is replaced by a Gal22V8, but I've not made the content yet.
The board is 100 x 100mm and has a bus connector that fits a design by a 8085 system.
Not tested ...

All —

While looking for 6545 CRTC schematics, I came across Hans’ archive of Elector 6502 stuff. Has anyone done reproduction or recreations of those? I really like the design so maybe I can do one.

Rich

Thank you very much!

Rich

I used the VIC-20CR (“cost reduced”) as the model and I think that used higher density RAM rather than the 2114’s. But it’s been a while since I looked at the schematic.

There’s at least one other clone out there. I did mine as more of a “how small can I get it” yet keep the flavor of the original. I could probably squeeze it tighter but then connector spacing and stuff would be off. I didn’t design it to be out in a VIC case otherwise it would be 14” long.

I don ...

They’re the same in the respect that they’re both VIC-20 recreations. I believe Dan’s is full size and mine I tried to get into an S-100 card size (10” x 5”). I eliminated the cassette interface due to the smaller board size but I left a header so you could make a dongle for it if needed. My test ...

David — no problems at all. Happy to have received this from you. I’m not as frequent a visitor here as I used to be but this will be very helpful for a project I’m working on.

Thanks again!
Rich

More projects being worked on (untested as of now; files on my Github repro):

VIC-1214 speech synthesizer. I can't find any info on the original, so I used the number for my re-do of an SP0256-AL2 based board I made in 1981. While it has edge fingers, it's designed to solder an EDAC edge connector ...

All --

Just a quick update. I ordered a version of the board with the user port edge connector and it works just fine, other than two data bus lines swapped (fixed with two cuts and two jumpers; Revision D).

I did another respin (not ordered yet, Revision E) that includes that fix, an extra ...

P3 prototype arrived last week. Naturally there is one small error that is fixed by two cuts and two jumpers (D4/D5 crossed). Otherwise, seems to work fine. I will be doing a 4th run at some point because I just added an S-Video modification which can be used with the stock DIN5 (based on http ...

I don't know how y'all store your chips, but I have the same aging-eyes problem. So, I use a Sharpie to write the chip number on the anti-static tube. Now, that always doesn't help once they're pulled, but I've also taken to using a magnifying visor (like a jeweler) to double-check things against ...

Thanks Steve! It has been a great project to work on. I only regret wasting a year noodling over why I had screen corruption. What triggered my re-examination of the schematic was a video I saw on YouTube, and then I started digging. Also didn't help that I also had a corrupted CHRGEN ROM (not sure ...

It's been a year since I've updated everyone on this project. After building it, I had some serious screen corruption that it took me a while to figure out, and naturally, other projects got in the way. It turns out there is an error in the originally-transcribed schematic regarding the memory read ...

Oh, my, this is very sad. My thoughts and prayers go out to his family. Ugh.

TI 74ALS133 still is in production (year 2021), ca. 3.32€, available at Mouser and DigiKey.
//Digikey also has TI 74F133 and 74S133 from Rochester Electronics.
I made the design right from the VIC20CR (cost-reduced) schematic, so I was just picking the logic families right from that. I'll make a ...