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

[rprosperi]

(03-19-2020 01:22 AM)mfleming Wrote:  

(03-18-2020 06:10 PM)Ken S Wrote:  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.

Everyone here who doesn't have this on their watch list raise their hand so I know who the other 14 of you are. Kidding aside, how difficult would it be to reproduce such a module? Though there is surely some custom logic involved, microprocessors and FPGAs have become quite small, if somewhat allergic to 5V.

The chip carrier and logic are probably not too bad, the board looks pretty simple, but isn't the set of sockets to accept the 11 pins in the Card Reader port somewhat unusual, and presumably hard to find?