30 Jul
2004
30 Jul
'04
12:57 p.m.
From: vrs <vrs(a)msn.com>
Hi
I did some searching on the web but never found any
27c256's faster than 70ns. I did find 27c512's and 27c010's
at 45ns a couple of places.
Dwight
OK. I was thinking about the microcode ROMs in an
HP9810 (somethign that
_I_ am working on, and those are most certainly 'hit' as soon as INIT is
deaseserted and the microocde program counter starts to change. I prefer
to think of general-purpose solutions (i.e. somethign that will replace
every 256*4 ROM), rather than soemthing that works only in specific
machines under specific circumstances.
I must not be getting it, somehow.
Why can't you just use a 45ns or 55ns 27c256 or 27c512 and swizzle the
pinout? These are around $3 per chip, and seem to meet the requirements.
Vince