I was surprised to find a Commodore RPN calcualtor - the SR4921 RPN.
Look for it in this museum:
http://www.calculators.de/
Commodore SR4921 RPN
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05-10-2003, 05:46 PM
05-10-2003, 06:00 PM
Do you know the Commodore 'Minuteman *6', Raymond
05-10-2003, 06:59 PM
I'm working on an online calculator catalog for users and the first user to upload a calculator, uploaded a 4921. I'm hoping to have a version up this weekend that will have the look and feel of the demo shots. It will eventually be fully searchable with thumbnails for quick loading. Stay tuned!
05-10-2003, 07:28 PM
I actually have this calculator. I was fortunate to win the auction on eBay. Not a bad looking calculator and it does use a 9 Volt battery, so I had it fired up and working pretty quickly.
05-11-2003, 09:57 AM
I remember receiving the newspaper clipping of an ad for a Corvus calculator with RPN. This must have been around 1974-75, and the newspaper was from Los Angeles, CA. Does anyone remember it? If I remember well, it was about equivalent to the HP-45. -Ernie
05-11-2003, 10:42 AM
An interesting coincidence!
05-11-2003, 02:03 PM
I have one of these and remember how much they used t advertise against the TI SR-51A slide rule calculator. It has trig, logs, couple of conversions. I searched long and hard for one of these. Like to have never found it. http://www.datamath.org/Related/Corvus/Corvus_500.htm The thing I remember most is that they used to have a chart comparing features with the SR-51A and it was about the most misleading thing you could imagine. There was a footnote at the bottom that indicated all the TI specs were taken from the SR-51A manual. Well, only if read by someone with their eyes closed! :-)
05-11-2003, 07:04 PM
Gene: >The thing I remember most is that they used to have a chart comparing features with the SR-51A and it was about the most misleading thing you could imagine. I agree. The Corvus 500 may be comparable to the HP-45, but not to the SR-51A. Thanks for sharing the link. I'm glad I ended up having a 51A and then an HP-25. -Ernie
05-12-2003, 06:08 PM
How does the register stack compare to HP's - number of levels, automatic lift, does rolldown rotate the registers etc. I see it is a "red dot" - makes it more valuable?!
05-12-2003, 06:58 PM
Hi Mike, did you get the manual with it?
05-12-2003, 10:30 PM
The SR4921RPN has a four level stack: X, Y, Z and W (instead of T). It operates similar to the standard HP stack, except the W register does not copy into Z upon an X and Y combo function (like addition, etc). The roll down is the same as HP. Mine has a red dot, my guess is that they all do....
05-14-2003, 05:36 AM
What ends up in Z after a 2 argument operation? Does it "repeat" like T on HP calculators? Then you could still do the constant operations by filling the stack. Although it's different, I kind of like the idea of an independent stack register, as W seems to be. |
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