Commodore VIC-20 drop-in replacement ROMs plus C64/VIC-20 dual character ROM

🛍️ Tindie store: www.tindie.com...
🛠 Tools and kit: / tools-and-kit-77570017
💬 Discord: / discord
😎 Ad-free, early access: / theretrochannel
Thanks for watching!

[@BillyMartin4Life]

Rock on, I bought 2 sets of ROMS for my 2 VIC-20's. Keep up the great work. Now that I think about, we're very close to being able to have a VIC-20 with completely new parts. Only thing missing is the VIC-I itself. Modern VIAs play nice in the VIC-20, you just need an adapter to get modern 6502 to play nice, you have these ROM replacements, and logic IC's are still being made

[@TheRetroChannel]

Thanks mate. Yeah we're almost there with the VIC-20, just missing the VIC part.

[@tenminutetokyo2643]

You made my day. Definitely ordering. I have a new VICKY TWENTY which almost works except for a bad kernel rom.

[@wimwiddershins]

Great stuff mate. Well done keeping them within the original chip footprint, they make for a tidy drop in replacement.

[@herbertwongsanimations6266]

I always thought the VIC 20 case looked like it needed more iron in it's diet. 😁

[@theEIGHTBitBox]

Very nice! This will keep the machines running for quite a while. I just discovered today, that you have your own store. Greetings from Germany!

[@SpaceAce57201]

Perfect timing as I’m currently in need of a replacement BASIC ROM. ✌️🥰

[@geehaf]

Great video and love your work. BTW are those Bunnings shelves I spy in the background :)

[@TheRetroChannel]

Hehe, yep. My benches are also made out of the wider Bunnings shelves

[@rimmersbryggeri]

Should it not be MOS inside? Or is that too ominous?

[@TheRetroChannel]

Haha. It was referring to the character ROM

[@timlocke3159]

I've swapped the VIC-20 and C64 character ROMs in VICE, which only requires copying the file into the correct ROM folder as wiring doesn't matter. The VIC-20 font is the same as the PET font, which was designed for 40 columns. I prefer the C64 font on the VIC-20 because the PET font looks too thin at 22 columns. I also prefer the PET font on the C64, although it wouldn't look good on a television, but it looks great on a CRT or LCD.

[@TheRetroChannel]

Yeah I think I prefer the 64 font on the VIC20, and VIC20/PET font on the 64

[@donaldblakley6796]

Excellent work. Now all we need is a vic chip replacement. I have 3 vic20s and they all work for now. I bought 2 parts boards a couple months ago... 1 vic has no paddle control and the other has bad audio:( I love the modern roms being available now. Again nice work

[@BillyMartin4Life]

I just had a random thought. Maybe this can be applied to the 65C02 to 6502 adapter, because that's just a 65C02, and logic IC, and 3 caps. If someone were to use surface mount parts, I bet it can be made to fit the footprint of the IC because the current adapter looks clunky

[@TheRetroChannel]

Might be possible. It would still have a slightly wider footprint than the original dip package as you'd need to offset the 65C02. Something like an extra 5mm to the left or right

[@carloscatano1750]

Fantastic! Thank you!

[@shangrilai1990]

🍪

[@TheRetroChannel]

🍟🍟🍟🍟🍟🍟

[@TUSIP]

When will your programmable versions relase? Because I was gonna buy some Eprom adapters for my 64s, but they were gonna need assembly and a separate adapter to program them on my T48. But if you relase ones that can be programmed like normal 27c series, I will buy them and program them.

[@TheRetroChannel]

It will be at least a couple of weeks, I'm currently waiting on the revised PCBs to arrive. I also have similar replacements for the 64 on the tindie store

[@TUSIP]

​@TheRetroChannel Hello, I want to ask you a question about your RF modulator replacement v2. I have commodore 64 and 128. I'm using a cheap AV to hdmi converter to connect them to my monitor. Converter works fine with my 64, but when I use my 128 screen, it looks washed out. Also, it becomes horrible when I use file browser in pi1541. I found the problem: the luma level of 128 is slightly higher than 64, and that causes a problem. Is there a resistor or capacitor that I can change on the modulator to slightly reduce luma of composite output?

[@TheRetroChannel]

@TUSIP If you have the RF replacement V2, then you should be able to adjust it with the onboard trimpot

[@TUSIP]

@@TheRetroChannel thank you