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Re: SAM replacement - nearly there
Posted: Fri Nov 24, 2023 5:34 pm
by sixxie
Still not managed to figure out the glitch glitch, but I figured I'd test it with Phill's diag cart.
At first it completely failed! But once I removed the special-casing of $FF3x:
- diag.jpg (105.78 KiB) Viewed 69588 times
Re: SAM replacement - nearly there
Posted: Sun Nov 26, 2023 10:00 pm
by sixxie
After a note from Stewart, the refresh tester output seems to be fixed (and along with it the transition from slow to actually-fast mode).
- reftest.jpg (115.19 KiB) Viewed 69562 times
Re: SAM replacement - nearly there
Posted: Wed Nov 29, 2023 4:56 pm
by sixxie
http://www.6809.org.uk/tmp/samx4-wip/silky.mp4
I'm not especially keen on what I had to do to make that work (delay video mode register setting by two full cycles!), but work it does.
So bar it turning out that it's screwed something else up by doing that, I'll try and prep the source etc. by the weekend.
Re: SAM replacement - nearly there
Posted: Wed Nov 29, 2023 5:42 pm
by sixxie
I'll just add that without a testbench that Stewart whipped up, fixing that would have taken a _lot_ longer, so thanks a lot, Stew!
Re: SAM replacement - nearly there
Posted: Wed Nov 29, 2023 7:57 pm
by robcfg
Looking great!
Have you considered implementing a full Dragon on something like the Tang Nano 20K or similar?
Re: SAM replacement - nearly there
Posted: Wed Nov 29, 2023 9:29 pm
by sixxie
robcfg wrote: ↑Wed Nov 29, 2023 7:57 pm
Have you considered implementing a full Dragon on something like the Tang Nano 20K or similar?
Well, no time soon I imagine. Aren't there already "mister" setups for coco/dragon?
Re: SAM replacement - nearly there
Posted: Fri Dec 01, 2023 2:15 pm
by sixxie
Right. This works for everything odd I can find to throw at it. So at the risk of triggering a really obvious realisation, here's the current state of play, with downloads and what-not:
http://www.6809.org.uk/dragon/samx4/