41CV new owner questions

[Massimo Gnerucci]

(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.

[TASP]

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.

[TASP]

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 !!