Re: Price !!!! Message #13 Posted by Mike Morrow on 23 Nov 2006, 3:25 p.m., in response to message #7 by Thomas Okken
For the maximum amount of memory in the HP-41 system, you'd need the HP-41CX which has 126 registers of extended memory, plus two X-Memory modules adding 238 registers each.
Since each register is seven bytes long, each X-Memory module adds a whopping 1666 bytes of memory! The HP42S with its 8 kbytes of RAM is huge in comparison with the maximum memory of the HP-41CX with two X-Memory modules.
So this auction will cost someone more than $100 for 1666 bytes!
I dug out my old HP-41CX which I haven't used for many years. In addition to the internal TIME and EXTENDED FUNCTIONS modules, I had long ago installed an X-Memory module, a MATH/STAT module, a THERMAL module, and one of my favorites, the IR PRINTER module.
I found the N-cells to be deader than a hammer, so I assumed that I'd lost all the programming I had put in place long ago. I removed the dead N-cells, but it was several days before I got new cells. Guess what? When I powered up the HP-41CX, the ONLY things I'd lost were the date, time, and associated format settings. It was still in USER mode with all the key assignments still intact, and my 400-step Runge-Kutta program for numerical solution of O.D.E.s worked perfectly. Apparently some stuff is preserved much longer than the "short time" promised in the manual when power is removed.
There's still a lot to like about the HP-41CX.
Mike / Alabama
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