HP-41CX w/ XF-Module - just curious

[Sylvain Cote]

(07-25-2019 05:11 PM)rprosperi Wrote:  When I inserted an XFM into a CX with multiple files stored, CAT-4 showed the first file (in the CX XMEM) and then jibberish characters, apparently confused by the bus contention Sylvain mentions. Though I wonder why the first file was intact. Upon removing the XFM module, the file chain in the CX XMEM was still intact, and I restored a file to verify the contents were also intact.

In a system that is not build to handle bus-contention, when a bus-contention event append, it either create a bus/system lock-up or cause the system to be unpredictable.
I have not made extensive tests with the extended memory content when a X-F/M in inserted in a 41CX, so my basic result could not be taken as a reference, it could be that I was just lucky.