RAMCAL design options

Thu Feb 25 11:46:09 GMT 1999

Option# 3 looks good.

Mike

Ludis Langens wrote:

> Several of you expressed interest in a MEMCAL with ECM writeable RAM.
> I'm calling this a RAMCAL.  See a previous message for an architectural
> overview of how custom software in the ECM could write to RAM without a
> ~WE signal.  Below are notes for three different implementations of a
> RAMCAL.  They work in ECMs using MEMCALs with 27128, 27256, or 27512
> type EPROMs.  The ROM mentioned in the designs refers to the EPROM in
> the MEMCAL (which is plugged into the RAMCAL's back and used to boot the
> ECM.)  All three designs are intended to use a 128Kbyte SRAM.  A 64KByte
> RAM would suffice, but the larger RAMs are cheaper and more common.
>
> So, Yea or Nay?
>
> --
> Ludis Langens                               ludis (at) cruzers (dot) com
> Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/