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HP41CL Secondary MMU Lockup - Howard Owen - 08-27-2021 05:56 PM I dusted off my old 41CL yesterday and was playing around with the secondary MMU settings. I accidentally swapped in an undefined configuration and the calculator locked up. Removing the batteries for a time got me a MEMORY LOST. After that, executing "MMUDIS MMUCLR "YFNZ" PLUG1L MMUEN locks up the calculator again. Have I bricked my expensive tech toy? P.S. This is v5 hardware. The YFNZ version is 4G RE: HP41CL Secondary MMU Lockup - Sylvain Cote - 08-27-2021 06:09 PM I have tried very hard to brick my 41CL and I was not able to do so permanently. Do another Memory Lost and redo your commands, it should works. If not, remove the batteries, {wait for ... see period below}, insert the batteries and redo your commands, it should works, if not, use a longer wait period. Wait period: 1 minute, 1 hours, 1 day, 1 week Sylvain PS: On a standard 41C/CV/CX I use a paper clip to short the first and last battery connector in the 41 case, but I do not remember if the trick works on the 41CL. RE: HP41CL Secondary MMU Lockup - Howard Owen - 08-27-2021 06:23 PM Thanks for your quick reply! (08-27-2021 06:09 PM)Sylvain Cote Wrote: Do another Memory Lost and redo your commands, it should works.Repeating the steps results in the same outcome. I've tried four or five repetitions, varying the configuration slightly. (08-27-2021 06:09 PM)Sylvain Cote Wrote: If not, remove the batteries, {wait for ... see period below}, insert the batteries and redo your commands, it should works, if not, use a longer wait period. One minute suffices to get me back to MEMORY LOST. I'm currently in the first one hour wait period to see if that improves things. RE: HP41CL Secondary MMU Lockup - Sylvain Cote - 08-27-2021 07:12 PM Howard, I am assuming that no physical modules is plugged at the back. Have you tried "YFNX" instead of "YFNZ" ? Sylvain RE: HP41CL Secondary MMU Lockup - Sylvain Cote - 08-27-2021 07:41 PM Howard, Maybe your problem is with the 41CL system RAM at page 0x804. You can brute force a complete clear of the 41CL with the following: Code: MMUDIS // disable MMU Sylvain RE: HP41CL Secondary MMU Lockup - Howard Owen - 08-27-2021 08:23 PM (08-27-2021 07:12 PM)Sylvain Cote Wrote: Howard, Oddly enough, loading YFNX seems to have fixed the problem. RE: HP41CL Secondary MMU Lockup - Geoff Quickfall - 09-05-2021 05:28 AM And Sylvain strikes again! Good one. |