Denial

Could you attach a photo?

When adding to the accumulator using ADC, how can I detect whether a zero roll-over has taken place? That's precisely what the carry bit is for, so your original code should have been bcc inc_src_hi_ptr_done There are a number of implementations of block moves in the 6502.org code repository, http:...

How can I disable the joystick port from the command line? I can see lots of options for configuring/adding joysticks in the VICE manual but nothing to actually remove the Keyset A setting. From the command line help -joydev1 <0-9> Set device for native joystick port (0: None, 1: Numpad, 2: Keyset ...

There were many manufacturers of these memories, Commodore were not consistent with which they used and you can consider them all suitable. The only parameter you need to be concerned about is the access time, that's the number of the end. The chip you want to replace ends in"-3" that mean...

The VIC-20 (and C64) need 9V AC (alternating current) on pins 6 and 7. Don't connect 9V DC to either pin, you'll probably fry something.

I built a PSU for an early two pin model, I used a toroidal transformer for that.

I presume they implement this

https://en.wikipedia.org/wiki/Basic_Lin ... ubprograms

No worries, it was fun. It's a really good game, the action is very smooth. I didn't notice any glitches while I was playing.

There's probably an official way of doing this but I rigged up a script that traced the whole transition for round 8 to 9. If you have symbols for this build I can load them and get something more readable.

[Edit: actually attach the file]

Finishing round 8 immediately gave me this
The CPU isn't jammed, the CPU history shows it is in a loop. I'll try and get a better record over the transition.

Thanks, I'll give that a try.

If I wasn't so crap at playing this I'd try to help debug this. Is there a hack to increase the lives?

There seem to be a number of designs for the C64 but, as you say, none for the VIC-20. There are often sellers on eBay that break systems and sell cases, that's probably the best replacement.

I've just pushed a new release, 1.15, which has quite a number of small bug fixes. I now have an extensive set of unit tests, that should hopefully prevent any regressions.

OK, I'm not a video expert but that looks like artefacts from upscaling?

Are the missing pixels consistent? As in, if one is missing in the top row of an "A" do all "A"s look the same? Can you attach a screenshot?