a classiccmp electronics project?

From: Dwight K. Elvey <dwight.elvey_at_amd.com>
Date: Fri Jul 30 19:57:56 2004

>From: vrs <vrs_at_msn.com>
>
>> 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
>
>

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
Received on Fri Jul 30 2004 - 19:57:56 BST