QBus framebuffers, was Re: Terak 8510 system on eBay
ethan.dicks at usap.gov
Fri Aug 15 02:50:00 CDT 2008
On Fri, Aug 15, 2008 at 08:20:47AM +0100, Gordon JC Pearce wrote:
> Well just to cover this reply and the couple of off-list emails I've
> had, I'm looking for *some sort* of framebuffer that I can fit to my
> PDP-11/73. Ideally it should be able to do a couple of greyscales (But
> 1-bit would be fine) or colour, and if it can spit out RS-170ish video
> that would be lovely.
I worked with one c. 1988 that fits the bill, but I can't even remember
the vendor now. Pertek, maybe? It was RGB, but did SOG, and we used it
as a 512x512 16-shades-of-grey on a mono security monitor. The only thing
odd about it was the tiny coax connectors for video out (my boss just
soldered a BNC pigtail to the bottom of the board at the "Green" connector).
> I've got loads of quad-height slots free.
This was dual-height, and, IIRC, easy to talk to from MACRO-11 programs
(i.e. - no driver).
> Now, I've been offered a VCB02 set, which I believe is from a MicroVAX.
> Will these work in a PDP11? Would I need to make any mods? Bear in
> mind that I'm most likely going to write the software from scratch.
That I don't know, but I would _suspect_ it should work, especially if
you are willing to roll your own code. I don't think it did needed
anything from the Qbus that a PDP-11 couldn't do. You could always check
an existing VAX driver for code examples - dunno if any of the BSDs
support it, but VMS and Ultrix should have both supported it.
Ethan Dicks, A-333-S Current South Pole Weather at 15-Aug-2008 at 07:40 Z
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Ethan.Dicks at usap.gov http://penguincentral.com/penguincentral.html
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