PDP8/A memory problems, what to do?

From: Ethan Dicks <erd_6502_at_yahoo.com>
Date: Wed Dec 26 20:18:39 2001

--- Pete Turnbull <pete_at_dunnington.u-net.com> wrote:
> On Dec 26, 14:20, Gunther Schadow wrote:
> > My first PDP-8 program is a memory test...
> Good idea. I meant to mention in my followup to Ethan, that the
> diagnostics are also available, at
> http://pdp-8.org/papertape/

Nice. Fortunately for me, I have several boxes of DEC diagnostic tapes
(nothing unusual, but I'll check my list against what you have) for
the -8/L and the -8/e. If anything interesting turns up in my collection,
I'll let you know. I do have a few DECUS tapes, including some FOCAL
> and the corresponding documentation is available at
> http://www.pdp8.net/query_docs/query_all.html

I've been there to print out the docs for the tapes I have. Many thanks!
(I do have the original sheets I got with the software, but it's been
filed and refiled so many times that I haven't seen it in years, but the
papertapes have stayed on the top layer).

If I didn't have a high-speed reader, I'd have already looked into down-
loading the tape images from a larger, net-connected computer. I may
have to do that when I start digging into the -8/e some more. It's on
the list below my -8/L and my Heath H-11 floppy controller (just got
some 8837 chips to perhaps fix the hang on the interrupt when the card
is installed in the grant chain).

At the moment, I think I have an M865 that works and an M8650 that may
or may not work. If I'm forced to use 20mA, I guess I'll have to dig
up a genuine IBM 8-bit serial card and mod it to switch it to current


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Received on Wed Dec 26 2001 - 20:18:39 GMT

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