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combining hp41 modules into one cartridge
02-13-2018, 02:19 AM
Post: #1
combining hp41 modules into one cartridge
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)
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02-13-2018, 02:32 AM (This post was last modified: 02-13-2018 02:36 AM by Mark Hardman.)
Post: #2
RE: combining hp41 modules into one cartridge
(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.

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02-13-2018, 02:48 AM
Post: #3
RE: combining hp41 modules into one cartridge
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.

Check out NQ41!
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02-13-2018, 03:47 AM
Post: #4
RE: combining hp41 modules into one cartridge
try this:

http://www.hpmuseum.org/guest/klug/dblxmem.pdf
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02-13-2018, 07:49 AM
Post: #5
RE: combining hp41 modules into one cartridge
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.
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02-13-2018, 09:22 PM
Post: #6
RE: combining hp41 modules into one cartridge
(02-13-2018 07:49 AM)damaltor Wrote:  if you succeed, i would be interested in the empty module shell and connector. Smile

3D printed Module shells can be found at:
https://www.shapeways.com/product/LSV44R...-inventory
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02-14-2018, 02:15 AM
Post: #7
RE: combining hp41 modules into one cartridge
Thanks!
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02-14-2018, 09:09 AM
Post: #8
RE: combining hp41 modules into one cartridge
(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. Smile

3D printed Module shells can be found at:
https://www.shapeways.com/product/LSV44R...-inventory

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