HP-41CV Card reader essential?

[RPNerd]

Another thing you might be interested in trying once you get used to your 41CV, and provided your one is what's known as a "fullnut" (as opposed to "halfnut"), is a 41CL CPU board by Monte Dalrymple.

https://systemyde.com/hp41/index.html

It's not cheap by any standards, but provides amazing value for money. In a "nut" shell, what you get with the 41CL if you also go for the optional Time Clone module is:

* a 41CX functional equivalent that can run at up to 50x the speed and already has a full complement (600 registers) of X-Mem
* hundreds of modules ready in flash memory to be "plugged" into the system virtually and used straight away
* The ability to back up the calculator's entire memory space to a page in flash memory so that it survives power loss
* (optionally) a serial port interface allowing you to update the modules in flash and to back up the calculator's contents to a PC/Mac (a lot of work was put into the software to do this by Sylvain Côté if memory serves).