HP-71b CMT-64E Eprom - Whats under the black goop ?

[Ken S]

(03-18-2020 05:48 AM)Dave Frederickson Wrote:  

(03-14-2020 08:56 AM)J-F Garnier Wrote:  A few years ago, Paul Berger and I attempted to document it and identify the pinout, see this document:
http://www.jeffcalc.hp41.eu/misc/files/hhp.pdf

On p.4 of the document is a picture of an HHP card reader port EPROM module. How was this module programmed?

Note: There is currently one of these modules on eBay.

Dave

I saw that and will bid on it. A while back I picked up one with the 32k ram and a half dozen burned eproms so could use those with this on one of my 71s.