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

From: Peter C. Wallace <>
Date: Sun Sep 12 11:21:09 2004

On Sat, 11 Sep 2004, Ben Franchuk wrote:

> Peter C. Wallace wrote:
> > This gives me a crazy idea of building an all transistor replica of a simple
> > CPU (with maybe a serial ALU) on a large single surface mount card (suitable
> > for framing). Maybe even with SMT LEDs on most of the collector loads - lots
> > of blinkenlights!
> So what about memory? Transistor too?
> A PDP-8/S would be a good model to pick from. Note you need a lot of SMT diodes
> resistors too.
> >
> > Peter Wallace

Memory is a problem, one thing is to have only a little (say 16X12) with
transistors or core. The other thing would be to cheat and black box it with a
memory chip

SMT transistors can be had for around $.01 each, diodes about the same,
resistors around $.005, LEDs are still about $.03.
(Assembly costs would be more than component costs)

Peter Wallace
Received on Sun Sep 12 2004 - 11:21:09 BST

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