1702A EPROM Programming

From: Dave McGuire <mcguire_at_neurotica.com>
Date: Fri Apr 13 13:42:54 2001

On April 13, Glenn Roberts wrote:
> I've been working with someone who has an old 8080-based single board
> computer he's trying to get to work. We're investigating several
> possible problems but it's starting to look like there's a problem with
> the EPROM. I have the ROM code he needs and will be checking out the
> EPROMS, but we may be faced with a need to reprogram one or both of
> these. They're the old 256 byte 1702A Intel chips (ceramic). I've only
> programmed the 27xx series but have read that the 1702's are "really
> difficult" to program. Was wondering if folks in this group could
> comment on how to proceed if/when we decide we need to reprogram one of
> these. Are there more modern plug compatible alternatives? We may also
> need to replace one or both - any sources known other than eBay?
> thanks.

  Wow...the 1702A required a -47V programming pulse, as I recall.
Eeeek!

   -Dave McGuire
Received on Fri Apr 13 2001 - 13:42:54 BST