Posts: 297
Threads: 25
Joined: Nov 2006
I assume that you mean the the MMU has been disabled. This will happen if the POR (power-on-reset) function on the CL board detects that the supply voltage has dropped below a certain value, even if transiently. The Time Module has a similar function built-in, although it operates off of a different supply. The one on the CL board itself monitors the 3.3V supply for the RAM and CPLD. I think that the only way that the POR(s) can be triggered is if the supply dips because of a surge in current drawn while the CL (and NoV-64) is powering up. Since it is affecting both the CL board and the Time module, this suggests to me that the problem is with the I/O block that connects the battery pack to the main board. If this current path is not able to carry the power-up current surge the voltages at the PORs might dip enough to trigger them. So I would check for corrosion/oxidation on the I/O block connections to the battery and the main board.
Monte
Posts: 556
Threads: 9
Joined: Jul 2007
I'm really wandering if there is anyone in this world to use the HP-41 for real work. I use it as a number cruncher because of nostalgia.
Posts: 774
Threads: 93
Joined: Aug 2005
Hi Geir, all,
Late as usual but I'd like to help.
Can you please, mail me with details so I can try to replicate the problem.
Thanks and best wishes.
Diego.