Replicas - was Re: *** Ideas needed for developing interactive

From: William Donzelli <>
Date: Sun Sep 12 21:31:39 2004

> Turn the problem around - the PDP-8/S has a backplane that is approximately
> 16" x 30" with over 100 Flip Chips. If you were to attempt to turn that
> particular design into a single planar board of the same size, the contents
> of each Flip Chip would have to fit into the same square area as one back-
> plane slot (about 0.5" x 3.5").

The PDP-8/s seems dense, but it is mostly air! While DEC made some nice
architectures, their mechanical people were a little behind the times. The
integration density of those old Flip Chips is pretty horrible, compared
with most other computer manufacturers. Think of the precentage of those
100+ Flip Chips that is blank board.

I am sure you could get a PDP-8/s come onto a 12 by 12 board, but I bet
that would be one expensive assembly!

William Donzelli
Received on Sun Sep 12 2004 - 21:31:39 BST

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