combining hp41 modules into one cartridge

combining hp41 modules into one cartridge - Printable Version

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combining hp41 modules into one cartridge - twdeckard - 02-13-2018 02:19 AM

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-PLAN41/blob/master/PLAN41.rpn (doomed to
remain incomplete and undebugged)

RE: combining hp41 modules into one cartridge - Mark Hardman - 02-13-2018 02:32 AM

(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-PLAN41/blob/master/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.

RE: combining hp41 modules into one cartridge - Craig Bladow - 02-13-2018 02:48 AM

I plan to do this with two extended memory modules, but I’m going to combine two single density memory modules first, so I have a better chance of success with the extended memory modules.

RE: combining hp41 modules into one cartridge - Nate Martin - 02-13-2018 03:47 AM

try this:

http://www.hpmuseum.org/guest/klug/dblxmem.pdf

RE: combining hp41 modules into one cartridge - damaltor - 02-13-2018 07:49 AM

if you succeed, i would be interested in the empty module shell and connector. Smile

Good luck on your project. the pdf linked by Nate Martin is probably the best starting point.

RE: combining hp41 modules into one cartridge - Nate Martin - 02-13-2018 09:22 PM

(02-13-2018 07:49 AM)damaltor Wrote: if you succeed, i would be interested in the empty module shell and connector.

3D printed Module shells can be found at:
https://www.shapeways.com/product/LSV44RV2W/41-module-3pc?optionId=64552214&li=shop-inventory

RE: combining hp41 modules into one cartridge - twdeckard - 02-14-2018 02:15 AM

Thanks!

RE: combining hp41 modules into one cartridge - damaltor - 02-14-2018 09:09 AM

(02-13-2018 09:22 PM)Nate Martin Wrote:
(02-13-2018 07:49 AM)damaltor Wrote: if you succeed, i would be interested in the empty module shell and connector.

3D printed Module shells can be found at:
https://www.shapeways.com/product/LSV44RV2W/41-module-3pc?optionId=64552214&li=shop-inventory

Thanks, i have seen that. Still the original shells are nicer, and the connector is hard to build from scratch Smile