Nov-64 Module Associated With Keyboard Latency

[lcwright1964]

The subject line sums it up. Here is the story:

My 41CX has sat safely on the shelf largely unused for some months, with the Nov-64 in Port 1 and batteries in.

Recently I turned it on, and the keyboard seemed weirdly unresponsive and the display showed a weird display that made me suspect some sort of corruption. Turned off the calc and took out the modules and operation was normal.

I erased the Nov-64 and programmed it anew with just HEPAX. I plugged it back into the CX and turned it on.

This time no funny display. The keyboard does respond and calculator seems to function normally with one exception--there is a latency (delay) of around a second with the pressing of every key. That is, I press the back arrow, I need to hold it for a bit to erase the display. I press Enter, digit, function keys, ALPHA, PRGM, and even OFF, and I need to hold it down for what seems forever before the key does what it is supposed to do.

Apart from this the calculator seems to work fine, even though it takes ages to type anything in because of these delays. The HEPAX functions seem alright and I am able to explore the directories, block assignments, CATs, etc.

With the Nov-64 out of the calculator all behaves normally, including the keyboard.

This is definitely a Nov-64 thing, as when I put the module in my 41CV the behaviour is precisely the same.

I have fresh batteries and there was no problem erasing and reprogramming the module using the most recent Clonix software on a Windows 10 machine.

There was no battery leakage or damage I can see, and, like I said, both 41s behave normally as long as the Nov-64 isn't inserted. Moreover, the module behaves as expected during erasing and reprogramming outside the calc.

But I still wonder--did months of keeping the module and batteries in the unused CXinterfere with how the Nov-64 draws power, the the point that when it is an 41C calculator it interferes with normal keyboard function, but not with how the module is written or read?

I am positively baffled at this and hope I can get some answers and insight.

Many thanks in advance.

Les