Old EPROM questions again, EPROM Programmer

From: ben franchuk <bfranchuk_at_jetnet.ab.ca>
Date: Thu Jul 29 21:59:20 2004

Tony Duell wrote:

>>Real He-men ( and women ) use logic gates. :)
> Care to explain the difference between a (microcode) ROM and an AND tree
> with the outputs ORed together :-)

Lots of tiny diodes to solder. :)
> -tony

All the cpu designs I have been doing have been random logic for the simple
fact I don't have regular instruction set and no PROM burner.
The minor problem of changing the design every few months does not help
the matter.
Also about 125 LS TTL chips for the Front Panel and CPU cards have left me
stumped on the best way to design it. I would like to create several PCB's
rather than wire wrap but I have yet to find good information on PCB
layout guide lines
and good **inexpensive** CAD software as well as small software tools.
You know like 8192 *words* of memory on your basic machine.

Ben.
Received on Thu Jul 29 2004 - 21:59:20 BST