On a related note, what kind of documentation is out there for the
various oddball QBus to Unibus converters? I have at least two of the
Plessy models that came from the USPS project in the 80's (they used
pdp11/23 cpus in a Q bus backplane next to a Unibus backplane that had
all the X.25 comm cards) but I haven't had a need to use them. I think
they were at least 18 bit cards.
What else was there?
On 2/12/2020 12:28 PM, Noel Chiappa via cctalk wrote:
> From: Jay Jaeger
> Yeah, info does seem to be scarce. Not even in my LEVAX fiche set.
My fiche set has the Technical Manual, and also (in the wirelist
section) the wirelist.
Not sure how to get it to you, though. I stuck it in my industrial-grade
scanner at its highest resolution; no go. I suppose I could take photos
of it displayed on my fiche reader?
Or is there some device I can buy which is less than a zillion dollars which
can scan fiche? There are a number of things in my set (e.g. the BA11-N Tech
Manual) which aren't online, and would be useful to have.
> That fourth card (M7268) is apparently a connector card for the Q-Bus
> and drive bus.
Yes, but actually there are 6 cards: the M7269 is a dual card which goes
into the QBUS backplane, and the M993-YA which goes into the first RK05,
to convert from the two flat cables which come from the M7268.
> From: Al Kossow
> Also, it is only 18 bits.
Actually, only 16-bit DMA addresses, I'm pretty sure.
Noel
