Unibus disk controller with modern storage
dab at froghouse.org
Thu Oct 20 15:55:33 CDT 2016
> Oh that blinkenlights panel is excellent! All emulators should have
> one! :-)
Yeah, isn't that fun? Once I got it running, I just sat and watched it
for about fifteen minutes while it ran our disk exercising program. And
then I noticed a bug. It apparently wasn't causing a problem but the
address line 00 was lighting up each time it did a DMA. That didn't
seem right. I looked through the Verilog and figured out what was going
on. It probably wouldn't have caused a problem, maybe, but I got to fix
it anyway. See? 'Dem blinkenlights are useful!
> I'm not really into Qbus much but would probably buy a
> production example anyway. I'd certainly fork out for several Unibus
> devices if you make them!
Our plan was to do a Unibus version of the same thing as a follow-on.
It ought to be reasonably straightforward.
> One tip from someone with same issue in a parallel endeavor (IBM
> System/360 panel): they look much better and more authentic with 'warm
> white' LEDs. These are the ones I'm using:
Yeah. You can see in this picture that the LEDs I picked have this
yellow lens. I was hoping that would warm up the output but obviously
it didn't. I looked through the list of 1206 and 0805 LEDs on DigiKey
and didn't find any that were obviously what I wanted. I'll take
suggestions from anyone. Or, I suppose, I could re-spin the board for
through-hole LEDs. I've actually come to prefer surface-mount though
and I'm hoping that one of these days I'll have my own pick and place
machine (or I'll talk our soon to exist MakerSpace into getting one).
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