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HP-41CX Bug?
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Post: #10
06-05-2009, 05:55 PM
 Hi All, Using my HP-41CX, I happened to execute CAT IND followed by the decimal and a stack register name (such as X or Y), expecting the command to use the value in the references stack register. Instead the calculator behaved like I entered CAT 0. Is this a know bug? Is it a bug at all? Am I missing something? Namir ▼
Post: #11
06-05-2009, 06:17 PM
My HP-41CX exhibits the identical behaviour, V41 too. If I put 2 into register 00 for example, CAT IND 00 performs CAT 2. If I put 2 into a stack register (any of them), CAT IND ST X (or Y or Z or T) performs CAT 0. Strange.
Another interesting thing: i41CX+ does not allow CAT IND. When CAT is pressed, it comes out as CAT' and SHIFT key is ignored after that. Edited: 5 June 2009, 6:22 p.m. ▼
Post: #12
06-06-2009, 10:30 AM
Regarding the I41CX and CAT ' , you probably have CCD installed. Without CCD, it does allow you to enter CAT IND etc. Nigel
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Post: #13
06-06-2009, 04:54 PM
Nigel, I believe that you are wrong. I have an HP-41C (early, all bugs version), an HP-41CV 'fullnut', an HP-41CX 'fullnut' and an HP-41CX 'halfnut'. All four instruments allow me to execute a CAT IND X, with no modules of any kind installed. The result is the same for all of them, regardless of what resides in the X register. The HP-41 executes a CAT 3. Dan
Post: #14
06-05-2009, 08:22 PM
Got any modules installed? ZenROM, CCD, and maybe other ROMs affect the way "partial key sequence" entry works. ▼
Post: #16
06-06-2009, 06:04 PM
You're right. After I removed CCD, Advantage, Math, and PPC modules, I now can execute CAT IND. However, as stated in a post below, the bug appears to be identical to the one on V41 and real HP-41.
Post: #17
06-06-2009, 10:29 AM
If memory serves me correctly, this 'bug' has been documented in at least one of the popular '3rd party' HP-41 books (Extend your HP-41?) It exists in all the HP-41 versions. It was omitted from almost all 'bug lists' because it was inconsequential. There was no real application for CAT IND (X-T), (CAT is not programmable) so the design and engineering effort was never expended by HP to 'fix' it. Dan |
