[rescue] VAX CPU Board on ebay

Jeffrey J.Nonken jeff_work at nonken.net
Thu Jan 30 11:44:35 CST 2003

On Sun, 26 Jan 2003 17:54:54 -0500, Dave McGuire <mcguire at neurotica.com>

> On Sunday, January 26, 2003, at 05:58 AM, Michael Schiller wrote:
> > I have (or possibly it's had by now) an issue of S-100 Microcomputing
> > that had an article about the soon to be released IBM-PC, and one of
> > the predictions in that article were that the machine would fail
> > miserably in the marketplace specifically because the CPU was on the
> > motherboard, and therefore not easily upgradable! Back then on the
> > S-100 buss machines the mobo was what might now be called a
> > daughterboard, it simply had a connection for the power supply, and a
> > bunch of S-100 card slots on it. You want an 8080 CPU, you get an
> > S-100 card with one. You want a 6800 CPU, you get a card with that CPU
> > on it, etc. etc.

Yeah, I have that same computer, except mine says "IMSAI" on the front. :)

>    The motherboards was what would now (and is commonly) called a
> backplane, you mean.  There's nothing "daughter" about it.

Backplane, yes.

Too bad S-100 was such a crappy bus, layout-wise. Ah well, mistakes are what
you learn from.

It is not lack of love but lack of friendship that makes unhappy marriages.
-Friedrich Nietzche

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