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!
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
(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
(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
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