Re: Value of HP25? Message #3 Posted by Hal Bitton on 6 Feb 2007, 2:33 a.m., in response to message #1 by John Polhemus
Hi John,
Your HP25 is certainly worth a respectable amount, especially if it still has the manuals and accessories. I would imagine such a set would easily bring $200+ on e-bay.
One caution I would pass on to you if I may, and if you are already aware of this please forgive me: If you use the calculator while the AC adapter is connected, and the battery pack loses contact, or even develops a bad contact, you can damage or ruin the calculator (the battery pack acts as the voltage regulator, and if it drops out of the circuit, overvoltage is applied to the calculator). It's best to charge your battery pack externally and not even connect the adapter to the calculator, but if you have no other way to charge it, I think you're safe if you don't turn the machine on while the adapter is connected. This wouldn't apply if it's a continous memory model, in which case the CMOS circuitry is always connected and remains vulnerable (any other posters please feel free to correct me if I'm wrong on this point).
Just a week or two ago I recall reading (with horror) an auction for an HP25 where the seller said the battery pack was missing and when he tried the machine with just the AC adapter, it displayed ramdom segments and was unresponsive...I wanted to yell "noooooo..." into my computer screen, as I mourned the death of yet another precious Woodstock machine.
Best regards, Hal
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