I took the extra wires off and its back working again. How can that BE???

I am beginning to be seriously demoralised with this thing. :-(

Sorry this is giving you so much trouble! Do you have an oscilloscope? If so, this may actually be a stroke of luck—you can now reproduce the error much more ...

Hello!

If you're using a modern 65C02 chip, you could take advantage of its fully static core and single-step through your program cycle by cycle; since you can hold each phase of the clock indefinitely, this would give you plenty of time to confirm that the circuit takes on the state you expect ...

Is it possible you forgot to rerender the fills before outputting. When using KiCad I keep hitting the B key like it’s some kind of nervous tic.

I usually have automatic refilling turned on in the plotting dialogue, but what happened this time around is that I used a plugin to render the gerbers ...

Perhaps if you have a drill press or jig you can carefully redrill the hole and, if all is well, maybe the boards can still be used enough to find the next fault!
I'll give that a try… if nothing else, taking a drill to the thing will feel therapeutic. I mean, I may accidentally drill more than ...

The mounting hole (H2) at upper left corner next to U9 may be the problem. It is a plated-through hole but there are no clearance pads for power nor ground plane so power and ground are shorted.
Bill, thank you so much, I think that's it! That mounting hole was clearly not rendered at all in the ...

When loading the files into the gerber viewer, I get a ton of error messages saying "unknown RS-274X extension found %TF%", so I tried to look up the code in my RS-274X book, and it's not there. The files do load, so I suppose there's something that just doesn't get interpreted along with the rest ...

Hi all!

I ordered a new batch of PCBs for my SBC, and, now that I have received them, the power rails are, inexplicably, shorted together, even with no components soldered on. I can't see anything in my schematic that suggests that anything is amiss, and so I'm not sure if there was an issue with ...

Very nice! Some very random ideas:

• Hangman
• Tic-tac-toe
• Snake (always a classic)
• Arithmetic trainer
• ASCII charset explorer (useful for learning how text display works!)

Edit: I see that Gordon beat me to snake

All the best to you, BDD. I look forward to many more updates on your POC

Here in the UK, in schools, the focus is on Scratch, a visual "language" followed by Python (in secondary/high school).

Ah, this brings back memories of my son trying to learn Scratch for his CS class in high school… he wasn't overly fond of it (and neither was I when he asked for help; we both ...

Have you considered Logo? It was built specifically for this reason (and, as I recall, there was a version for the Apple ][, so you might even be lucky enough to find some source code!).

It might be helpful if you could tell us a bit more about what you're trying to do.

One possible solution is to use a trampoline written in a separate assembler file, where you can specify the origin, that simply jumps to the address of your C function; that way, you can just rely on the the linker ...

I have a few spares that I bought from China a while back (they were suspiciously inexpensive, but they seem to perform to spec, at least to the extent that my 'scope can validate).

I don't know if I just got lucky, but I'm happy to drop one in the mail if you pm me your address.

I think you means 3 loops on one wire, not three wires wrapped on. Right?
Sorry for the confusion—I did mean 3 wires; it's really tight, though. Two is a much more comfortable fit.

I found these on ebay: https://www.ebay.ca/itm/171907473800?hash=item28067be188:g:XxUAAOSwv0tVE23W

This would ...

I can get three “good” wraps (where some of the insulation wraps around the pin) around a single pin. Never having worked with the real thing, I don't know if that's good or bad, but it works for me!