HP Forum Archive 12

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Commodore SR4921 RPN Message #1 Posted by Gordon Dyer on 10 May 2003, 5:46 p.m. I was surprised to find a Commodore RPN calcualtor - the SR4921 RPN. Look for it in this museum: http://www.calculators.de/

Other RPN-like calcs from CBM Message #2 Posted by Raymond Del Tondo (Germany) on 10 May 2003, 6:00 p.m., in response to message #1 by Gordon Dyer Do you know the Commodore 'Minuteman *6', and the 'Minuteman *6X' ? The latter has even an ENTER key. Raymond

Corvus? Message #3 Posted by Ernie Malaga on 11 May 2003, 9:57 a.m., in response to message #2 by Raymond Del Tondo (Germany) 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

The Corvus 500 Message #4 Posted by Gene on 11 May 2003, 2:03 p.m., in response to message #3 by Ernie Malaga 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! :-)

Re: The Corvus 500 Message #5 Posted by Ernie Malaga on 11 May 2003, 7:04 p.m., in response to message #4 by Gene 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

Interesting! Message #6 Posted by Mike on 10 May 2003, 6:59 p.m., in response to message #1 by Gordon Dyer I'm working on an online calculator catalog for users and the first user to upload a calculator, uploaded a 4921. Commodore 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!

Re: Interesting! Message #7 Posted by Gordon Dyer on 11 May 2003, 10:42 a.m., in response to message #6 by Mike An interesting coincidence! I would like to find one to buy as I have several other Commodores.

Re: Commodore SR4921 RPN Message #8 Posted by Mike Hicks on 10 May 2003, 7:28 p.m., in response to message #1 by Gordon Dyer 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.

Re: Commodore SR4921 RPN Message #9 Posted by Ellis Easley on 12 May 2003, 6:08 p.m., in response to message #8 by Mike Hicks 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?!

Re: Commodore SR4921 RPN Message #10 Posted by Mike Hicks on 12 May 2003, 10:30 p.m., in response to message #9 by Ellis Easley 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....

Re: Commodore SR4921 RPN Message #11 Posted by Ellis Easley on 14 May 2003, 5:36 a.m., in response to message #10 by Mike Hicks 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.

Re: Commodore SR4921 RPN Message #12 Posted by Gordon Dyer on 12 May 2003, 6:58 p.m., in response to message #8 by Mike Hicks Hi Mike, did you get the manual with it? Would you consider sending me a scan (300dpi colour) of the calculator and manual if you have it? Thanks

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