Free memory on an HP-41CX...



#2

Most of you would have noticed my multiple posts about those 'nice' sellers on eBay recently. In any event, I purchased an HP-41CX that has a 'SIZE 100' set and shows '.END. REG 169' in 'PROGRAM' mode. My HP-41C with four memory modules shows 219 registers. I turn the CX on and off a few times and then it has 156 registers of program memory!!! What is going on here? Any insights?


#3

Andreas Terzis wrote:

> I turn the CX on and off a few times and then it has 156
> registers of program memory!!! What is going on here? Any
> insights?

bad memory

is it a fullnut or a half nut?

**vp


#4

It's a Halfnut. I reset it and after that it didn't do it again, after 20 times of turning it on and off. It has an Advantage module plugged in it as well as a 'Dbl Mem' module. Do you know of any diagnostics to try?


#5

Quote:
as well as a 'Dbl Mem' module

Is this extended memory or standard memory (which *must* not be installed in a CV or CX!)

Marcus


#6

Marcus,
That is extended memory. It shows 600 registers after an EMDIR. It is a custom module that contains 2 X-Memory modules.
I turned the machine on, switched to PRGM mode and then the machine turned off. When I turned it on, it had fewer program registers !?@&*
And since this is a new day and I haven't said it yet today, 'eBay sellers rock... I love it when they take us for a ride ...'
Andreas


#7

Hello, Andreas --

Quote:
And since this is a new day and I haven't said it yet today, 'eBay sellers rock... I love it when they take us for a ride ...' Andreas

I sympathize with your difficulties pertaining to your halfnut 41CX, but it should be noted that many eBay sellers don't really know much about the HP calculators they offer. They may not even be aware of problems they should divulge. A seller's expertise can usually be deduced reasonably well from the auction description. Failure or refusal to answer questions gives even more insight. Some sellers do know about their product, and are also very upstanding. You can expect to pay more to win their auctions, because other buyers recognize it.

My personal experience buying two fullnut 41's through eBay has worked out fairly well, all things considered.

  • The first was a cosmetically- and mechanically-excellent 1984 41CX that sometimes worked, but frequently malfunctioned after I received it via US airmail. Since the calc was described in the auction as fully functional, I offered the seller a choice of letting me keep it for for a substantial refund (I really didn't need or want a "parts machine"), or taking it back a nearly-full refund. The seller let me keep it at a very low price, but eight months went by before I discovered Randy's business at "www.fixthatcalc.com". Ultrasonic cleaning and some resoldering made it function perfectly, for a very reasonable price. I was so pleased with the outcome, I then sent supplemental payments to the eBay seller amounting to the $150 eBay auction selling price, less repair costs, in order to pay him what the CX proved to be worth.

  • The second was an 1980 41C that had seen heavy use in a lab -- very dusty in the auction pictures, and with velcro pads on the back for wall mounting. It sold for around $50, due to the poor cosmetics. It also malfunctioned upon arrival as the CX did, but had not been described as functionally perfect, so I did not complain. I sent it to Randy, and he performed the same cleaning/resoldering service, inside and out. Now, it's a virtually-perfect unit -- a fine example of the improved 2nd-year US-made HP-41, with no hard-to-read "tall keys" or bugs, a solid feel, and the most legible display.

The moral here is "caveat emptor" -- let the buyer beware (and assume some risk of additional expense if things aren't quite perfect).

Regards,

-- KS


Edited: 20 Mar 2006, 1:32 a.m.


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