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From: "Duane C. Johnson"
Subject: Re: Calculator math processor (like the MM57109)
Date: Thu, 12 Dec 2002 06:28:57 -0600
Organization: Red Rock Energy http://www.redrok.com
X-Mailer: Mozilla 4.77 [en] (Win95; U)
Yes, I have looked at Microchips Ap note 660 on the
floating point and trig functions. Unfortunately for
me this level of programing is quite beyond my
capabilities. Besides they don't show all the functions
and none of the inverses.
A kind gentleman, Edward Buckley ,
suggested I look at:
A bit steep at $33 but if it works well it sounds
worth the cost.
This peripheral co processor does everything that I
wanted in a similar manner to the MM57109. OK, it
can't run on its own but I need a controlling micro
It communicates through an SPI type interface and
appears to be quite fast.
It looks to be a hard coded PIC micro.
I just ordered 2 to try out.
I will report on my progress here.
Are there any other similar products to the PAK-IV?
"Duane C. Johnson" wrote:
> I have an application that is math intensive but doesn't
> need to operate quickly. The math involves astronomical
> calculations so will use trig functions. Cost and low power
> are important.
> Many years ago I used a neat chip from National Semiconductor
> called an MM57109. This chip was a full scientific calculator
> with a digital interface instead of a more common keyboard
> interface. I had a CD1802 development computer from Netronics
> that used it to make a pretty good Basic program.
> I have 5 of these chips but they are now antiques.
> Two are in a calculator made by National Semiconductor.
> I understand the Intel 8231 and AMD 9511 worked in a similar
> way. I have not used these though.
> Anyway I'm looking for a modern version.
> I'm having a difficult time finding any companies that sell
> just the calculator chips. I could possibly fashion an
> interface that looks like a keyboard and LCD.
> I'm investigating in this method so I can use relatively
> simple PIC micros with limited memory capabilities.
> OK, wouldn't it be neat to find one with an I2C interface!
> Thanks, Duane
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