Looks great Rich! I'm glad to see my Kicad schematics turn into a real working board! Well done!
Sorry about the transcription error. As usual I have too many project ideas and not enough time to complete them.

Steve

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 how that happens with a mask ROM, but whatever).

I created a GitHub repro for it (https://github.com/RichCini/VIC-20-Reloaded) so people can take a look. The final size is just a tad bigger than S-100 size (10.375" x 5.375") which is smaller than the keyboard. So, it's not really designed to be a stock replacement, but something smaller. Plus, you can use a PS/2 keyboard with it if you use one of the external matrix encoder boards from Jim Brain (although I haven't tried that).

I ordered a third prototype run this week to make sure it's all works as expected, but the schematic changes between revisions are very minor (fixing the RAM R/W and adding two fuses).

Enjoy.

Rich

_________________
Rich Cini
Build Master and maintainer of the Altair32 Emulation project
http://cini.classiccmp.org
http://altair32.classiccmp.org

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://sleepingelephant.com/denial/wiki ... deo_output) -- two components and three jumpers.

After this, there's not much more I can squeeze. I thought about adding two mounting holes to support the matrix keyboard encoder. Might still do that.

Rich

_________________
Rich Cini
Build Master and maintainer of the Altair32 Emulation project
http://cini.classiccmp.org
http://altair32.classiccmp.org

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 mounting hole, and a mod for separating chroma from luma (a popular mod for the VIC) that requires three jumpers. Steve is independently building the D-revision to see if there are are any "buildability" changes needed.

I've tested the board with the Retro Innovations PS2-to-matrix encoder and that works as well. I don't use it regularly, but its something I wanted to test.

More to come...

Rich

_________________
Rich Cini
Build Master and maintainer of the Altair32 Emulation project
http://cini.classiccmp.org
http://altair32.classiccmp.org

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 to it.

VIC-1005 3-slot expansion board. Uses separate header from backplane to accommodate vertical cartridges.

Enjoy

Rich

_________________
Rich Cini
Build Master and maintainer of the Altair32 Emulation project
http://cini.classiccmp.org
http://altair32.classiccmp.org