PDP8/A memory problems, what to do?

From: Pete Turnbull <pete_at_dunnington.u-net.com>
Date: Thu Dec 27 05:36:31 2001

On Dec 26, 18:18, Ethan Dicks wrote:
> --- 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)

I don't deserve any credit for the tapes and docs online -- they're the
fruits of serveral other people's labours :-) pdp8.org is Aaron Nabil's
site, and David Gesswien provides the docs at www.pdp8.net

> 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
> loop.

You probably know you can use an M8650 in RS232 mode. If you don't have a
BC01V cable wired for RS232, Doug Jones' site has an excellent diagram, and
a useful document explaining how to set up the baud rate etc (BTW, the note
about changing the capacitor value for baud rates other than 110 only
applies to current-loop operation). How different is an M865? Is it only


Pete						Peter Turnbull
						Network Manager
						University of York
Received on Thu Dec 27 2001 - 05:36:31 GMT

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