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+--- Thread: HP-41CX CPU broad install to HP-41C (/thread-19552.html)
HP-41CX CPU broad install to HP-41C - zixingcheche - 02-13-2023 04:42 AM
Hi all
Same as title, can I change the 41C’s CPU broad with 41CX’s CPU broad?
I have working 41c & 41cx, but enter key of 41cx has some issue.
I want to install the 41CX’s cpu into 41c.
Any issues? Risk?
Thanks!
Thanks!
RE: HP-41CX CPU broad install to HP-41C - ThomasF - 02-13-2023 07:49 AM
Hi,
No, that is not possible, since the 41CX has a totally different internal design.
See e.g. the pictures here of the internals of the 41C and 41CX: HP41C Museum
The C and CV had a separate board for the CPU and memory, but CX used both components on the keyboard PCB and a totally different board.
Switching between C and CV is normally no problem, but the CX is a different beast ...
Cheers,
Thomas
RE: HP-41CX CPU broad install to HP-41C - Harald - 02-13-2023 09:15 AM
(02-13-2023 07:49 AM)ThomasF Wrote: The C and CV had a separate board for the CPU and memory, but CX used both components on the keyboard PCB and a totally different board.
That depends. If the CX is a Halfnut, that is true, but if it is a Fullnut, then the boards can be interchanged. There might be a display driver incompatibility in some cases, but I can't remember. Maybe someone with more knowlage on the 41 can enlighten us.
You can tell if the CX is a Fullnut or a Halfnut by looking at the display. The Halfnut has rounded display corners.
Cheers,
Harald
RE: HP-41CX CPU broad install to HP-41C - ThomasF - 02-13-2023 09:39 AM
(02-13-2023 09:15 AM)Harald Wrote:(02-13-2023 07:49 AM)ThomasF Wrote: The C and CV had a separate board for the CPU and memory, but CX used both components on the keyboard PCB and a totally different board.
That depends. If the CX is a Halfnut, that is true, but if it is a Fullnut, then the boards can be interchanged.
Thanks Harald!
Yes, that it true - I was just thinking of the Halfnut CX, but there also exists Fullnut CX, and then it might work!
Have swapped a lot of C and CV boards, but never had a CX board to swap ...
Cheers,
Thomas
RE: HP-41CX CPU broad install to HP-41C - zixingcheche - 02-13-2023 01:34 PM
Hi Thomas, Harald,
Thank you for your reply!
My 41cx is halfnut, and 41c is fullnut.
So, the cpu broad can not be exchanged.
Understand, thanks!
BR,
Bai