combining hp41 modules into one cartridge

[Mark Hardman]

(02-13-2018 02:19 AM)twdeckard Wrote:  Greetings. Can someone point me to any documentation on shoehorning two ROM circuits into one cartridge? I recall a French article that described how careful soldering and perhaps a little sandpaper could put two 4K ROMs in one package.

Also, for someone expert in this manuever can you put an Extended Memory together w a 8K ROM because the address spaces don’t overlap?

Thanks
Todd
https://github.com/twdeckard/HP41CX-SLANTR?files=1
https://github.com/twdeckard/HP41CX-PLAN...PLAN41.rpn (doomed to
remain incomplete and undebugged)

This thread in the old forums section would be a good place to start:

Double Extended memory module HP41cx..

PeterP references specific issues of PPC:

PPC V11N1 p28 - Procedure for Module Doubling/Tripling
PPC V13N7 p21 - Procedure for Module Doubling/Tripling

If you don't already have a copy of the PPC DVD, it can be purchased for a modest amount from Jake Schwartz at http://www.pahhc.org/ppccdrom.htm.