PDP 8/L repair log - hopefully the LAST installment!

From: Ethan Dicks <erd_6502_at_yahoo.com>
Date: Thu Mar 27 20:52:01 2003

--- Charles <charlesmorris_at_direcway.com> wrote:
> The 8/L is finally fixed!

Congrats!

> Lastly, the TTY receiver card M706 would only work when on an
> extender card....

A) What rev M706 card do you have? (early rev M-series modules look
like they were done on a whole-board grid with signal lines taped
where needed; later boards have just as much copper as required,
with the chips as close to the backplane as routing allows)

B) Would you write up where you attached your pullups?

None of my M706 cards have behaved badly like that, but if I run across
a setting where I see that behavior, I'd like to benefit from your
efforts.

> I've just finished constructing my "DF32x4" disk simulator (PC
> boards in a 1U [1.75" high] rack chassis). I'm starting to debug
> now - so far I had a bad IDC connector and (of course) no spare. I
> will make Eagle .SCH and .BRD files available to anyone who wants
> them IF it ever works ;)

That sounds great! I'm interested. I have a few -8/Ls and an -8/I that
could use a disk device. I even have one BM08, giving me 12K on one
-8/L. I'd *love* to be able to show off OS/8 on it.

Are you using a microprocessor on your DF32x4? FPGAs? PALs? TTL?
How are you handling the cabling issue? Do you have a way to load
the emulated disk devices "out of band"? (i.e., can you get data into
it in any way other than the databreak interface to the -8?)

> [demime 1.01a removed an attachment of type image/jpeg which had a name
> of mvc-457e.jpg]

What's the picture of?

-ethan
Received on Thu Mar 27 2003 - 20:52:01 GMT