HP calculator is back

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to

Check this out

I think it is because they give you the INV check box in conjunction with the X^2 button to do the square root. I don't think it is a fair trade.

John

I use something called RPN on a Palm Zire 21 PDA. It works very well and the Zire 21 isn't any bigger than a calculator.

Leon

Probably an HP-41C. I still use the one I purchased at about that time. I think it has gone throug 4 sets of size N batteries since then. I don't use the mag card reader any more, though. I did buy the navigation pack at one time to solve celestial navigation problems. GPS has rendered that navigation solution moot.

I started with a KIM-1 board based on the 6502 processor. Similar I/O facilities.

I was already programming the KIM-1, a SWTPC 6800 system and Apple II computers by the time I got the HP-41C. My first programming experience with a calculator came with a WANG desktop about the size of a portable typewriter. That was in about 1975.

Nostalgic is fine. You're no older than your last delivered project!

Mark Borgerson

The 41C came out that year, and it was $600 or so...if they were lending it out, it was probably an HP67.

Cheers,

Phil Hobbs

Hello Leon,

Yeah but it requires using a stylus and you won't get 15 years out of that Li-Ion battery. Plus it needs to be recharged a lot while the old HP11C doesn't. Anyway, if someone want to look at a review:

Hello Budgie,

is

to

AFAIR it needs three thick coin cells. Can be bought at Long's and other places, regular stuff. It's been a long time since I had to buy set #2.

You see the size of this thing!

I wish they would bring back the HP32Sii. That is a fine calculator. Unfortunately, the going e-bay price for the HP32Sii is frequently in the $150 to $250 range for a $50 calculator.

Amazing! Looks just like my TI-83, which I don't use ;-)

My preferred calculator is an old TI-60X

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

?! sqrt(x) = x^(1/2)

Cheers Terry

thats what I paid for my 28S in 1986, NZ dollars :)

Cheers Terry

Exactly. Rather than raising to the power of 2, you raise to the power of the reciprocal of 2, i.e. 1/2.

Or did I misunderstand your "?!"?

Steve

I really liked calculators etc. back in the 80's (encompassing the 11C,

1. I can do it on the back of a napkin (or more likely in my head!)
2. It takes a supercomputer.

RPN with swap comes the closest to having the "gozinta" button. As in "3.14 gozinta 180 how many times?".

Tim.

I use google, no need for a mouse and it understands hex and binary even mixed

-Lasse

Hello Tim,

Hmm. When I want to figure out a resonant frequency of an LC circuit I could do it on a napkin but these things tear too easily and then I have to clean ink off the table. Or worse, my wife sees that blue stain on the table linen and goes ballistic. So I don't.

Can't do that in my head, at least not without a brewsky.

Still, this doesn't need a super computer. Only a slide rule calculator or the 11C ;-)

The best is the back arrow button. Kind of a step reset. The ARRL handbook had the most concise description for such functions: It is the "I-didn't-mean-to-press-that-button" button.

I just wondered how you can do that with the "X^2" button.

Cheers Terry

By qualifying it with the INV key, i.e. perform the inverse/reciprocal operation.

Steve

On my TI60X it's NUM1 y^x NUM2 x^-1 =

...Jim Thompson