More Info (was Re: HP 2100S microcode blanks?) MMI 63S140

From: Philip Freidin <>
Date: Thu Feb 3 23:42:47 2005

On Thu, 3 Feb 2005 19:29:33 -0600, you wrote:
>So it thus appears the same chip (or compatibles after programming) can be
>used for all of the following:
>HP 2100S microcode
>HP 21MX-M/E/F loader roms
>HP 21MX-M/E/F 1K microcode (but not 4K or 8K microcode chips of course)
>Even finding 82S129's at 5 bucks a pop, still makes it painful for me to buy
>about 40 of them *sigh* I wonder if it's possible to move six 1K 82S129's
>into an 8K chip (I think 82S181) without the processor knowing it. Might
>make those Access IOP microcode chips more cost-effective.

Are the MMI 63S140 (open collector rather than Tri-State) PROMs of any use
for this or other date-challenged equipment?

Received on Thu Feb 03 2005 - 23:42:47 GMT

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