Commodore SR4921 RPN



#13

I was surprised to find a Commodore RPN calcualtor - the SR4921 RPN.

Look for it in this museum:

http://www.calculators.de/


#14

Do you know the Commodore 'Minuteman *6',
and the 'Minuteman *6X' ?
The latter has even an ENTER key.

Raymond


#15

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


#16

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! :-)


#17

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

#18

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!


#19

An interesting coincidence!

I would like to find one to buy as I have several other Commodores.

#20

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.


#21

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?!


#22

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....


#23

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.

#24

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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