New subject: M865/M8650 (was Re: PDP8/A memory problems, what to do?)

26 Dec 2001

On Dec 26, 18:18, Ethan Dicks wrote:
...

 --- Pete Turnbull &lt;pete(a)dunnington.u-net.com&gt; 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
current-loop?

http://www.cs.uiowa.edu/~jones/pdp8/hard8e/

-- 
Pete						Peter Turnbull
						Network Manager
						University of York