Gigatron Hackers

Personally I would stick to one mode and avoid the component increase. Another tack is simply to move the clock speed up to 8 MHz with help of some 74F logic and/or different pull-ups as Ken has done. We can then burst 213x120 pixels: a 9X reduction of the standard 1920x1080 resolution for 16:9 LCD ...

You can use one of the 4 high XOUT bits as a control bit. They were intended as general purpose output (the LEDs are just an indicator).

One thing to address is the 8 color palette. I believe it looks bad, like Teletext. Compare these two: rrggbb-Baboon-160x120.png rgb-Baboon-320x120.png Ugh, the image looks much worse! Maybe it is possible to avoid fully saturated colors by some clever recombination of the available bits. The 16-col...

It shouldn't be too hard to make a custom ROM that sends out more pixels per line. If not from RAM, they could be black, giving only half a screen. Maybe even squeeze some vCPU time in there. I can look into this during the Easter weekend. This would bring back the horizontal pulse frequency into a...

I don't understand the problem...

Indeed, tWP is shorter than the total write cycle time. On the breadboard prototype we had a symmetrical clock, because it was just a 25.175 MHz oscillator that got divided by a counter. That was before we switched to a more authentic oscillating circuit.

Yes, just follow the markings on the PCB.


See also the instruction video: https://youtu.be/pXCHROQ-lS4

Please e-mail us at support@gigatron.io and we get it arranged

yes that is the case....i mispoke...when i said first i meant to say d8 or one closest to power ok led thanks Ok. Note that just reversal of R8 doesn't explain the computer isn't running yet. It only explains the differences in brightness for the blinkenklights (and that is harmless by itself). So ...

It's all in the manual and in the Troubleshooting page: Screenshot 2019-04-17 at 21.32.53.png Screenshot 2019-04-17 at 21.29.24.png From the Troubleshooting page: If the “Power OK” LED is lit and stable, double-check that all components are placed in the correct orientation: the ICs, resistor arrays...