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'Calculator chip ? [OT['
1999\08\17@180411 by Darren Logan

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Hi,

Anyone got any ideas as to which type of processors are used in calculators ?

It makes me laugh because you can buy a calcultor with immense math power for
the price of a single PIC.. and yet a PIC is pretty poor in terms of it's
maths capability. Where's the logic in that ? (pardon the pun).

Cheers,
Darren

1999\08\17@182937 by Jose Souto

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face
HP for instance uses special BCD chips and the math involved
in functions like sin() takes several miliseconds to accomplish.
They have ROM for constants like pi() and many other. I have
an old HP jounal in which they state that and explain some
algorithms.
:-)
J Souto

Darren Logan wrote:

{Quote hidden}

1999\08\17@185645 by l.allen

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Darren Logan wrote:
>
> > Hi,
> >
> > Anyone got any ideas as to which type of processors are used in calculators
?
> >
> > It makes me laugh because you can buy a calcultor with immense math power fo
r
> > the price of a single PIC.. and yet a PIC is pretty poor in terms of it's
> > maths capability. Where's the logic in that ? (pardon the pun).
> >
> > Cheers,
> > Darren

Comparing a general controller to a specialized maths processor is
comparing apples with bananas. Calculators are slow and used stored
values for things like PI, but of course are very good at what they
are designed to do.
Comparing DSP chips with PIC's would make the PIC look fairly sick at
FFT work etc.
PICs (and the like) are low cost, fast controllers that run at
low power levels and are easy to programme.

P.S. There are serious safety issues concerning Hamburgers.
1. Hamburgers become unstable at high voltages
2. Hamburgers will not stop a high velocity bullet from 1000metres
3. Hamburgers will fail to restrain a crash victim at 120 km/hr
4. Hamburgers are inadequate as a ground proximity warning device in
   aircraft.
5. Hamburgers are known to have been eaten by %90 of fatal disease
   suffers.

The list goes on.......
_____________________________

Lance Allen
Technical Officer
Uni of Auckland
Psych Dept
New Zealand
_____________________________

1999\08\17@190259 by Dennis Plunkett

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At 19:26 17/08/99 -0300, you wrote:
>HP for instance uses special BCD chips and the math involved
>in functions like sin() takes several miliseconds to accomplish.
>They have ROM for constants like pi() and many other. I have
>an old HP jounal in which they state that and explain some
>algorithms.
>:-)
>J Souto
>

HP are changing tact on this one as the processors that they use are
special one offs and are quite expensive to manufacture. They now are
looking into actually using a real off the shelf processor! (Or one of
several depending on the task and putting all the maths into software)


Dennis



>Darren Logan wrote:
>
>> Hi,
>>
>> Anyone got any ideas as to which type of processors are used in
calculators ?
>>
>> It makes me laugh because you can buy a calcultor with immense math
power for
>> the price of a single PIC.. and yet a PIC is pretty poor in terms of it's
>> maths capability. Where's the logic in that ? (pardon the pun).
>>
>> Cheers,
>> Darren
>
>

1999\08\17@190505 by Bob Drzyzgula

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I don't think that the chips are particularly powerful;
Most of the TI graphing calculators, for example, use
Z80 chips, although the high-end models (e.g. the TI-92)
use MC68000s.  Some functions are undoubtedly impemented
as lookup tables, possibly with interpolation to fill
out gaps in the tables.  The apparant power that you
see in those calculators is in part a reflection of
how unbelievably powerful modern microprocessor chips
are. Even a lame little go-ped of a chip like the Z80
can do basic floating-point arithmetic at what seems
to a human operator -- who is concious only of wall
clock time -- to be blazing speed. A PIC could probably
be programmed to be a decent calculator, even handling
double-precision floating point and 3D graphics, and at
20MHz would probably not seem all that bad. Even if it
took 5000 clock cycles (at quarter the osc. frequency)
to multiply two floating point numbers, you could still do
such a calculation in a millisecond. The main problem one
would have trying to do something like a TI-83 with a PIC
would be memory capacity. PICs (at least mid-range PICs)
don't have support for the of memory expansion that one
gets with something like a Z80 or even an 8051.

--Bob

On Tue, Aug 17, 1999 at 06:01:29PM -0400, Darren Logan wrote:
{Quote hidden}

--
============================================================
Bob Drzyzgula                             It's not a problem
spam_OUTbobTakeThisOuTspamdrzyzgula.org                until something bad happens
============================================================

1999\08\17@191314 by Harold Hallikainen

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On Tue, 17 Aug 1999 18:01:29 EDT Darren Logan <.....DAZLOGANKILLspamspam@spam@AOL.COM> writes:
>Hi,
>
>Anyone got any ideas as to which type of processors are used in
>calculators ?
>
>It makes me laugh because you can buy a calcultor with immense math
>power for
>the price of a single PIC.. and yet a PIC is pretty poor in terms of
>it's
>maths capability. Where's the logic in that ? (pardon the pun).
>

       Of course, the "immense math power" in the calculator is all in
the software (or firmware), not in the chip.  I imagine you could make a
reasonable calculator with a PIC.

Harold



Harold Hallikainen
haroldspamKILLspamhallikainen.com
Hallikainen & Friends, Inc.
See the FCC Rules at http://hallikainen.com/FccRules and comments filed
in LPFM proceeding at http://hallikainen.com/lpfm


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1999\08\17@204008 by Wesley Moore (Yallara)

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I have a Texas Instruments TI-89 Graphing Calculator which has a Motorola
68k processor, however I don't think this is what you meant. The IC's in
basic calculators would be custom made for that particular purpose and
nothing else.

On Tue, 17 Aug 1999, Darren Logan wrote:

{Quote hidden}

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