Gigatron Hackers

Fyi, one VCFB visitor told me that: His Arduino Nano worked fine when he was still on ROMv3, but The Nano stopped working somewhere between ROMv3 and ROMv4 (he was following dev roms) While his Arduino Uno is still operating fine I don't know what to make of that yet. I suspect either a timing thing...

I gave a Gigatron talk at VCF Berlin. The slides are here on HaD: https://cdn.hackaday.io/files/207818890 ... ronTTL.pdf

The whole thing is still a bit shaky, but now this significant part already works: we have floating point (just in time for VCF Berlin)!

While solving GitHub issue #41 , and in figuring out where in RAM to put the SDC/MMC file loader, we got interested to learn where existing GT1 files tend to load. Answering this is not too hard when combining gt1dump.py, awk and gnuplot. The result is the heatmap attached. We can see nobody loads i...

That ROM v3y hasn't changed. The programmed refresh rate is for 31.25 kHz at 12.5 MHz. So at that speed, shrink the displayed pixels... Last week I tested it again on my 15 MHz system after soldering the last color resistors (I had ran out of 820 Ohms). But then I found the game controller doesn't r...

Where can I find such talks? They're all over the place by now :-). There's an early one on the Gigatron site's front page , and there's a recent one from Moscow in this subforum. So if that is just a line of pixels, then I could find a way to get them from memory and output them? Personally I have...

Next stage of testing v6502 has to be Micro-Soft BASIC with floating point. We're not quite there yet as it goes awry after the memory check. But by reorganising the video indirection table we can squeeze in the entire 8.3 KB BASIC binary and don't have to compromise too much on screen space. We sho...

Encoding is the binary form. It's code that bursts 160 pixels, and then turns to black. Walter's Gigatron talks explain practically everything about the native instruction set and video generation. I'm not familiar with Atari architectures (other than the 2600 ).

I have not built a Gigatron yet. It seems very interesting. What I'd like to see is a way to get the video out of software and have dedicated circuitry for it. Now, generating sync pulses is the easiest. But I can't figure out where the pixels come from. The pixel burst is this snippet in ROM: addr...

I believe we're ready for VCF Berlin next weekend