TTL computing

From: Ben Franchuk <>
Date: Fri Apr 12 09:39:28 2002

Richard Erlacher wrote:

> Using a PROM to implement a combinatorial path has always been the most costly
> way to do it. I don't think it was as common as you suggest. Such an
> application is likely to lead to very sparse ROM utilization. The ROM has a
> fixed Or and fixed AND array, hence has to have many more registers in it than
> a programmable logic device capable of the same logic, and, likewise, many
> more than the equivalent logic implemented discretely in SSI/MSI logic.

How ever the ROM does contain ALL the possible states compared to PAL's
or discrete logic.
BTW B.G micro does sell 74LS170's, and AM2901's.
Ben Franchuk - Dawn * 12/24 bit cpu *
Received on Fri Apr 12 2002 - 09:39:28 BST

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