Waiting on some parts for the VIC chip replacement project so that’s on hold now this week. Might build this Super Snapshot replica board this evening. #commodore
I know you were just sitting there wondering if a VIC-20 will boot off of an external 3.3v clock signal. The answer is surprisingly: yes. Scope here shows activity on all of the RAM from the CPU. Neato! #commodore
This VIC-20 got HOT. Swapped the linear regulator with a modern switching ($9). Before: 46C drawing 2.3 amps. After: 26C drawing 1.03 amps. Much better. #commodore
I’m gonna need to set up a dedicated workspace for this #vicsrevenge project. My desk can’t look like this for a year. Hmm. #commodore
I’m collecting Verilog examples and tutorials. If you have recommendations, please let me know. Bonus if they are in book form. #FPGA #Verilog
Happy friday! How about a little 80 column PET love this morning? Zig Zag array will do nicely. #commodore #PET
With bi directional level shifters the final board will have less chips. VIC-20 system clock replacement from the FPGA. 3v logic input is yellow, 5v output is purple. Freq is correct. Shape needs work. Ringing is mostly breadboard parasitics #commodore #vicsrevenge
Feel super spoiled with 32 channels. #commodore
Romulator by @bitfixer is turning out to be a great troubleshooting tool for repairing VIC-20s. This is the second board donated to the #vicsrevenge 6560/1 drop in replacement project I was able to get working again in a few minutes with the Romulator’s help #commodore
I’m sure there are libraries for this, but creating the MOS parts in KiCAD is helping me wrap my mind around everything. 6560/1 is this morning’s project, I’ll open source (Github) when I have them all done and correct #commodore #vicsrevenge
Michael Doornbos 