HP-29C Neutral Operations

[dmh]

My 29C (never opened/repaired while I've had it but unknown background) does the same as the emulator (ie X=4, Y=1, Z=1, T=0) after Tony's test above.

Serial number starts with 1806S.

(02-12-2024 03:44 AM)rprosperi Wrote:  

(02-12-2024 12:25 AM)brouhaha Wrote:  Bob, do you know the 1820-nnnn part numbers of your 29C's original ACT and the replacement? I agree that this shouldn't have anything to do with the calculator behavior deviating from the documentation, but I'm interested in data points on both the original factory usage of the various ACT part numbers, and what is known to work.

I don't know, but I suppose it's printed on the chip? I admit to not really wanting to open a perfectly operating 29C... maybe I'll get courageous...

[Background] I had a 29c with a fried ACT and sent it (long ago) to Bernhard along with an HP-21 to replace a '21 ACT he had on hand, used for the transplant. Bernhard was initially assuming it would not work as it was a relatively early 21, but to his surprise it worked flawlessly in all ways. I've used it for years and found it totally compatible, at least AFAICT.

If no one else checks and reports on behavior with another 29C/19C, by mid-week I can locate one of my 19Cs and give it a quick test.