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Who made the first handheld graphing calculator?



#2

Does anyone know who sold the first graphing calculator? Was it Sharp, HP, Casio, Or TI? I think TIs earliest graphing calculator was the TI 81 made in 1990. I think HPs earliest is the HP 28C in 1987. is there an earlier graphing calculator?

ARUID


#3

Casio made the first graphing calculator, the fx-7000G. See US Patent 4794553 (note that the foreign priority date of May 24, 1985, is 1 1/2 years before introduction of the HP-28C).

#4

I think it was Casio, then followed by the Hp28C by a few months later. I am thinking either a Casio fx-6000 series or the Casio fx-7000.


#5

I used to made crude graphs in the HP41C. One kind divides the function values in three ranges, and graphs more or less as:

- - _ - _ - ' ' ' -

The other uses "black" density of a character to suggest value (often called Schmoo Polts in the 1980s), a typical display would be:

- - + - * * - +

The HP41 also was able to PLOT when connected to the 82143 printer...


#6

And of course the HP41 could drive the HP7470 (Opt 003 -- HPIL) plotter. There's even a 'Plotter ROM' for the HP41 which includes a program to plot a function on the plotter.
But the 7470 plotter is hardly a handheld device...

#7

It depends on how one defines 'graphing calculator'. If you
mean a large graphical screen with medium to large resolution, you are probably right.

But if it is defined to mean a handheld calculator with
an LCD dot-matrix display where the dots are individually addressable, you could consider the HP-71B, which has
a one-line, 132x8 display, and the Sharp PC-1500 (aka TRS 80
PC-2) which has a 156x7 display, though the Sharp PC-1350,
a later model (though still vintage) qualifies better as it has a much larger
150x32 graphical display while being smaller and much
lighter than either the HP-71B or the Sharp PC-1500.

#8

You have to go way back -- I strongly recommend "The Pencil -- A History of Design and Circumstance" (or something like that) by Henry Petroski . . .

Ohhh! You asked about graphing calculators . . .

#9

The HP42S (c.1987) can graph on its two line display. HP even included a program in the user's manual to do it.


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