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+--- Thread: 41CV new owner questions (/thread-3901.html)
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RE: 41CV new owner questions - Massimo Gnerucci - 05-26-2015 12:51 PM
(05-26-2015 11:26 AM)Dieter Wrote:(05-22-2015 03:59 AM)TASP Wrote: An XMEM or 2 will need an XFUN also. Just on principle I'd suggest a Rev. C, but a deal on a B or an unknown would be worth watching for. Also, a Rev. G card reader is suggested if you're serious about the XMEM, the VER bug is annoying, but not everyone VERs cards as much as I do.
In Cat 2 my X-Mem show up as "-EXT FCN 1C". Is this what you call "Rev. C"? What are the differences compared to Rev. B or others, so that C is the preferred version?
And what about the VER bug? My card reader is version 1E, I never had problems with the VER command (yes, I used it quite often). So why do you prefer version G, or in other words: what's wrong with my version 1E?
Dieter
Hi Dieter!
Here's an hint from an old thread.
RE: 41CV new owner questions - TASP - 05-26-2015 12:58 PM
The VER function will corrupt one data register in the XM. Can't recall offhand if it is the 'second' or 'third' block of XM. Rev. G (and higher if they made them) card readers have had the VER function modified to not bother the XM.
PPCJournal had a routine for allowing use of the VER function in rev. F and earlier card readers, but I'm not recalling what issue it was in.
RE: 41CV new owner questions - TASP - 05-26-2015 01:52 PM
Keith Jarret's book, HP-41 Extended Functions Made Easy, in the "Bugs" chapter (pages 3-5) notes the Rev. B XFun has a problem with SAVEP, PCLPS, and PURFL and gives a longer discussion of the problems on pages 12 and 13, and pages 19 thru 21.
Revision C fixes those bugs, or if you have a Rev B, Keith's book has solutions for that module.
The CX has a built in XFun with more features, and does not have the above bugs. A CX will experience the VER bug if it has additional XM and is used with a Rev F or earlier card reader.
THANX Keith !!