On Mon, 13 Sep 2004, vrs wrote:
>
> ----- Original Message -----
> From: "Peter C. Wallace" <pcw_at_mesanet.com>
> To: "General Discussion: On-Topic and Off-Topic Posts"
> <cctalk_at_classiccmp.org>
> Sent: Monday, September 13, 2004 10:18 AM
> Subject: Re: Replicas - was Re: *** Ideas needed for developing interactive
>
>
> > On Sun, 12 Sep 2004, vrs wrote:
> >
> > > > An SMT transistorized machine would be an interesting project, but
> hell to
> > > > debug I would imagine.
> > >
> > > One could perhaps build it out of modules -- make SMT versions of Rxxx
> > > modules, etc., then use those to build up the CPU. Then one could debug
> at
> > > the module level before tackling the whole thing.
> > >
> > > Vince
> > >
> >
> > Thats something I could do as a feasability experiment
> >
> > Are the schematics of the (say dual FF that used for the registers) on
> line
> > anywhere? I could sneek that on my next mixed 4 layer panel
>
> Here is a nice collection of many the module schematics:
>
> http://bitsavers.org/pdf/dec/modules/KI10_moduleSchems_V2_Oct74.pdf
>
> and here the ones that are specific to the straight-8:
>
> http://bitsavers.org/pdf/dec/pdp8/F-87_PDP-8_MaintMan.pdf starting in
> chapter 10.
>
> I have been looking at the R210 module when thinking about feasibility,
> myself. It is double-height, so the original took up 0.5" by 5.375" of
> backplane space. (It is on page 10-15, or page 255 of the PDF.) I chose
> that one because it looked fairly hairy :-).
I'll take a look at that one, Maybe with right angle .050" or 2mm connector
so I could plug it onto a full size flip-chip adapter...
>
> I think it would be interesting to make one with an edge connector (so it
> could be tested in a real straight-8), then "smash" it into the area
> formerly taken by the socket. In principle, you could do that to the whole
> CPU, then decide if it was worth the trouble to re-arrange the components
> (or not) after you were fairly sure of the correctness of your
> implementation.
>
> Vince
>
Peter Wallace
Received on Mon Sep 13 2004 - 16:41:33 BST