I follow your tips for a complete overview of HP calculators (i already have a 35, 75, 41, 38G, 30S) and find a HP-11C in hummm... "marché au puces" :-). I put new batt and cleaned it well. It works good but looks bad; is it possible to "sand" the silver around the display, it have a lot of small scratch.

Is it possible to have more than one program in the memory like the 41 (that i just began learning too...) or i need to put programs in the same big one with number labels?

It's just a feeling but i think i prefer the 41; excuse me if i "offense" someone :-) but the 11C seems to have less possibility than the older 41 no? Is the 15C "better" than the 41 so? ha i still have the problem : which one should i learn deeply!?



I believe that "flea market" is something world-wide., comme le marché aux puces, n'est pas?

Maybe the HP11C does not fit your needs, but some few advantages must be emphasized.

[] all available resources are printed in the keyboard; you do not need to search for a particular command spelling in any catalog. You look at the keyboard and see what you need (except for a few shortcuts I'll post below)

[] you have gamma function (x!) in the HP11C instead of factorial (FACT, or n!) in the HP41; you do not need to program these;

[] all hyperbolic and their inverse are ready to use in the HP11C; they are not available in the HP41 as standard catalog 1 functions (you need to program)
[] probability -Py,x- and combination -Cy,x- in the HP11C (same as above)
[] longer battery life
[] (subject note:) the HP11C is easier to learn to use, mostly because it has less resources, although the 41's equivalents are as powerful as the ones in the HP11C)

[] they are one of the most reliable series of calculators HP has ever offered to the users (except for some well known vintage bulldozers)

Some disadvantages are: (against the HP41, not absolute disadvantages)

[] program listings are keycode based, the same way you'd find in some vintage calculators (HP25, TI57/58/59, HP67/97, and many others); it is not a bad thing, it's only time consuming and a bit awkward for users not used to this sort of coding

[] no I/O facilities

[] no ALPHA resources in the HP11C's display, except for a few error messages

[] the HP11C has only 210 bytes of memory available, about half the HP41C's standard memory (1/8 the CV)

I have all Voyager models BUT the HP10C, also the three different HP41 (C, CV, CX), and there are moments I prefer one of the Voyagers (brief calculus, brief SW development, advanced HP15C and 16C ready-to-use functions) instead of one of the HP41. Just a matter of what to do with.

Wouldn't you like to try the 11C a bit more?

Would someone else add other advantages/disadvantages?

Cheers. (I'd never feel offended when someone express his own preferences... Mostly when it's done rationally, as you have surely done)



sometimes I read my own posts and realize I promise to do something and simply forget it.. Senior moments?

Both HP11C and 15C have some "hidden" shortcuts, and some are not emphasized in their manuals.

The ones most known are related to the USER mode. The primary functions of the first five keys (left-to-right) of the first row are traded with their shifted functions [A] to [E]. When USER mode is active, pressing any of these keys mean [GSB]A to [GSB]E, run or program mode.

The sequence [RCL][SIGMA], where SIGMA is the summation symbol used in Statistics function, retrieves the contents of both [SIGMA]Y and [SIGMA]X respectively to the Y- and X-registers. I believe this is the only keystroke sequence that places two values in two different stack registers in one single operation.

Suppressing [SHIFT] key in many situations is rational and valid. As an example, [I] is printed over [TAN] key, and [RCL][I] is a valid sequence. If one use [RCL][SHIFT][I] in a program, the recorded keycode is 45 25, instead of 45 42 25, meaning [RCL][SHIFT][I] is shortened to [RCL][I]

In the 11C only, if you press [SHIFT][I] or [SHIFT][(i)] you are performing [RCL][I] and [RCL][(i)]; this does not work with the HP15C, because [SHIFT][(i)] is not programmable (review imaginary part contents) and [SHIFT][I] is indeed a valid sequence, meaning create a complex number

If I missed some, please folks, complete my post.

Best regards.


i like the 41 better than any other calc i know of, but:
the voyagers are very robust and likely to be working even if you find one at the "mercado de pulgas". they were designed and built very well. a dozen years on a set of batteries is normal. you might get some "scotch brite" and carefully polish the bezil (always paralel with the existing polish-horizontally) after taping off the plastic parts and "11c" button to hide the scratches. the silver is just aluminum and is solid-not plated.

btw; an 11 was my first hp back in 81. i gave it to an old girlfriend when i got my first 41cx in 83. god, i miss that 11c.

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