I purchased a used 41-CV on eBay. I was fairly satisfied, but I think it is actually an HP-41C that someone mated to an HP-41CV upper half/keyboard. Or the main circuit board is from an HP-41C.
Unless I am really rusty, I should be able to execute
SIZE 070 since the CV should have 319 registers. I can only allocate 63 registers (00-62). If this is the case, I will return the calculator. The CV does not have a SIZE? command/instruction like the CX.
The serial number is 2326S40643, but I guess that doesn't mean very much.
Any advice? Am I missing something? It's been a few years since I used my other HP-41CX.