Video Bringup: Part 2
Video works! Er, sort of. After fixing the HYSNC problem, I experimented with the palette chip, just to prove it was working. With a few bytes’ worth of changes, I was able to turn everything red. The monitor was still…
Category BMOW 1
The original BMOW: a custom-designed, hand-built 8-bit CPU and computer.
Video Bringup: Part 1
After an eternity of procrastination and wire-wrapping, I finally finished BMOW’s video subsystem. Well, not quite finished really: the character generator is still missing, but the all the hardware is there to support the pure graphics modes. It’s about time!…
Video Update
I’ve been distracted by some other projects, and haven’t made as much progress on BMOW as I’d like. They were interesting distractions, at least: I worked on a crystal radio project with my daughter, and did some brainstorming about a…
Video System Design
The BMOW video system design is done! Save for that one question about the correct current source setup that I mentioned previously, everything is nailed down to the last detail. I tried to cram in the maximum amount of flexibility…
Current Source Confusion
I’m about ready to call the BMOW video system design officially complete, and hopefully I’ll be posting specs soon. I’ve run into one last snag, however. The UM70C171 palette chip requires a reference current to calibrate the DAC output. The…
Decisions, Decisions
I honestly cannot make up my find about whether to use this salvaged UM70C171 VGA palette chip as part of my video system design. I’ve changed my mind four times already in the past couple of days. I think I’m…
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