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

From: Eric Smith <eric_at_brouhaha.com>
Date: Fri Feb 4 02:24:44 2005

Jay wrote:
> 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.

The microcode is 24 bits wide, and no common PROMs are more than 8 bits
wide, so you'd need at least three PROMs in any case. But with big
PROMs, you could store more microcode options in the three PROMs.
Received on Fri Feb 04 2005 - 02:24:44 GMT