Strange 15C behavior



#24

hello,

A question for you who know everything...

on the 15C, when you do an operation that results in an overflow (like 999 Y^x 999), the screen displays 9999999 99 and blinks...

but the strange thing is that how do you turn the blink OFF after that? it seems to just stay on blink until you do a OFF ON cycle...

regards, cyrille


#25

Hello Cyrille,

please clear flag 9. A simple <- (i.e. delete, left arrow) will do as well d8)

Ceterum censeo: HP, launch a 43S.

Walter

Edited: 31 July 2009, 4:16 p.m.


#26

A wild guess: Cyrille is working on something. ;)


#27

Surprise! d;)

Expecting a state-of-the-art display at least -- wanting to read commands instead of key codes in programs. And IIRC there were some more items on the wishlist.

#28

... and he don't asked about "Error" or "OF".

I would welcome questions about "Global Span"!


#29

15C+ here we come!

I know that the following idea is pie-in-the-sky but I would really like to see the 11C get reissued as well. So many aspects of the 11C are so spot-on that I consider it one of the most elegant machines HP ever came up with. It might seem rather primitive compared to the all-singing, all-dancing machines of today but I like to believe there is still demand for the simpler and more immediately intuitive calculator which the 11C typifies.

Mark


#30

Mark,

I like the 11C as well for the same reasons that you mention. However, if you ignore the features on the 15C that the 11C does not have (matrix operations, complex math, etc.) the only usability differences are that most of the tests (x<0, etc.) on the 15C have to be looked up on the back of the calculator. All of the un-shifted and most of the shifted functions are assigned to the same keys on both calculators. I'll be happy with the 15C+ even though I like the 11C for it's simplicity.

-Katie


#31

Katie - yes, very valid points you raise and there isn't much I can add! I just have a soft spot for the 11C for reasons already stated but I would also be very happy with a new 15C+.

Mark

#32

If I had gotten a 15c rather than an 11c way back in 82, I wonder if I would have become much more interested in using Matrices to solve equations, and if that might have led to even more proficiency, which might have led to a degree in mathematics, which might have....

too many what ifs.

But I like the 11c, too. It was my first love :-)

#33

Quote:
However, if you ignore the features on the 15C that the 11C does not have (matrix operations, complex math, etc.) the only usability differences are that most of the tests (x<0, etc.) on the 15C have to be looked up on the back of the calculator. All of the un-shifted and most of the shifted functions are assigned to the same keys on both calculators.

Hi, Katie --

Yes, that's exactly right. H-P actually managed to slightly improve the arrangment of functions on the keyboard of the HP-15C over the HP-11C, even as four major elements of functionality were added using the same keyboard. Great thinking and engineering!

The broad set of functions on the on the HP-15C required intelligent use of two-byte operation codes where necessary. (The HP-11C and HP-34C used only one-byte keycodes, which explains why some reasonable functions were curiously missing from each.)

A thread from 2006 with many contributors:

HP-34C/11C instruction codes (corrected)

Essentially, when the HP-15C was introduced, the fine HP-11C was eclipsed, superseded, and supplanted, except maybe to occupy a price niche.

Here's a detailed discussion from three years ago:

HP-15C functionality and keyboard layout

-- KS

Edited: 2 Aug 2009, 3:42 a.m.

#34

Uh oh... and here come dozens of responses jumping to wild conclusions based on one tiny little question!! Poor Cyrille! ;-)

Ah well, it doesn't hurt anything to hope and dream!


#35

Maybe so ... or maybe he is asking about the HP15C to throw us off ... cause he might be working on a resurrected HP41C??? After all, this is the 30th anniversary of that machine.

Namir


#36

I would be happy if someone found some time to "fix up" the 35s. It's got potential.


Regards,


John


#37

Quote:
I would be happy if someone found some time to "fix up" the 35s. It's got potential.

Regards,

John


Yes, thank you for this message.

The 32SII was a popular machine for good reasons, and here we have a worthy successor - if it weren't for those bugs. I bought one but dislike using it, since I have to keep too many problems with it in mind. I'd buy an updated version that includes a R<>P conversion.


#38

Quote:
I'd buy an updated version that includes a R<>P conversion
I wouldn't. Not before they fix the keyboard and add connectivity at least.
I miss to see the point of reissuing the 15c without the above plus mnemonic commands and more memory
Regards

#39

Still no keyboard problems on my side (except for what I consider a firmware bug), but I'd welcome a micro SD card slot and would prefer that much over USB :-).

#40

Quote:
miss to see the point of reissuing the 15c without the above plus mnemonic commands and more memory

These would be nice to have for sure. But the 15C+ seems like it will be 150 times faster than the original 15C which will allow for programs that were impractical before. Slow running solve, integrate or matrix functions will be instantaneous.

I really appreciate the speed improvements on the 12C+ over the original 12C. It's really nice to not have to wait for an answer on a TVM calculation.


#41

Quote:
But the 15C+ seems like it will be 150 times faster than the original 15C which will allow for programs that were impractical before. Slow running solve, integrate or matrix functions will be instantaneous.

Well, I don't know about "instantaneous", but I do have a program to solve for eigenvalues using matrix operations and the root solver, which takes about 5 minutes on average to execute. I guess it would run in about 2 seconds, which is pretty awesome.


Edited: 1 Aug 2009, 4:25 p.m.

#42

Well at least he gets a good laugh out of us from time to time:-)


#43

Actually, we don't actually work on anything. Rather, we sit around and talk about what we can do to completely misdirect everyone for giggles.

TW

#44

HP's selling those on the app store, must be a problem with them.

Speaking of iPhone emulators...

I'm playing with a very fun TI-59 emulator running on the iPHone.

Hilarious putting in the LBL A + 1 = RST program and having it count to over 1,000,000 in a minute. :-)


#45

Quote:
HP's selling those on the app store, must be a problem with them.

Dang! Party Pooper :)

Regards,
Howard

#46

Gene:

You wrote:

Quote:
I'm playing with a very fun TI-59 emulator running on the iPHone.

Hilarious putting in the LBL A + 1 = RST program and having it count to over 1,000,000 in a minute. :-)


It should count substantially faster if you shorten the program to + 1 RST and press RST R/S to start the program. With a real TI-59 the count for a minute increases from 507 to 658 for a minute.

Palmer


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