Denial

JonBrawn wrote: ↑Fri May 31, 2024 11:49 pm Are these available pre-built and firmware flashed?

Not that I'm aware of. I keep toying with the idea of building a batch, but I'm the wrong side of the Atlantic for you.

Glad to see you back. Will follow with interest.

The Final Expansion 3 card has a super ROM mode that does this.

Edit: I missed you want to bank $A000 and $B000 separately. The FE3 can't do this.

Can you post your cart setup code?

Hi. I have a VIC 20 CR board with a bodge wire on the back that appears to connect the audio pin of the VIC chip to pin Y on the expansion port via a 1K resistor. What does this actually do? Are there any cartidges that use this? Do you have a picture? Somewhere I've seen a schematic this this labe...

Marsupial wrote: ↑Fri May 17, 2024 6:01 pm One of them does not change from all caps to upper/lower when I hit shift-C=.

I assume you've isolated the keyboard as a cause by trying to switch by software?
Check continuity on A11 between the character ROM socket and the 74LS245.

EDIT: If you clone https://github.com/SvenMichaelKlose/tunix.git you must NOT forget to do a "git submodules update --init --recursive" before doing anything else. Or just specify submodules need to be also cloned $ git clone --recurse-submodules https://github.com/SvenMichaelKlose/tunix....

My suggestion would be to normalise this so it's integer-based. They're always faster than FP calculations. You could then use X% and Y%, and so forth, which I think speeds up the interpreter. You could also unroll the GOSUB calls, though that's a personal call. Integer arithmetic in CBM BASIC is s...

Line number lookup in BASIC is a linear search from the start of the program. I'd suggest moving line 80 to the top of the program.

Revisiting my X-Pander 3 VIC design as I plan to get it up on Github and perhaps consider a re-run. It had bugs and I'd like to get them fixed before I put something into the wild. Is there a preferred port spacing? I've just checked the spacing in my Arfon expansion unit, the slots are 1in apart. ...

If it's this device

https://github.com/bwack/C64-Switchless ... 56-adapter

Then it uses the EXROM signal from the PLA. There's no equivalent of that on the VIC-20.

tokra wrote: ↑Thu Apr 11, 2024 3:21 am Links are not working (403 error).

Fine for me, they're http links which some browsers block by default.

The RESTORE key handling in the C64 is quite different to the VIC, it goes through a 7474 flip-flop if I recall. Do you have a photo of how this is wired up in the C64?

Having only recently picked up a clean, tested, working Vic-20 for (I think) a very reasonable price with local pickup, I've just started checking UK eBay to see what other interesting items I can find to add to my latest nostalgic experience. What the heck, eBay? Why is everything Vic-20 related s...

I've yet to work out how to load the CRT image of wAx2, which resides in the source folder of the zip file I downloaded from GitHub. I recall there was a thread about the CRT format. I'll take a look and see if I can write a converter to generate a loader file from one. Edit: Full documentation is ...