Sharp plotting calculator - Forgot the model number,
it's in the archives
somewhere. A battery operated desktop calculator with 4-color pen plotter!
This is the only calculator I've seen with a built-in plotter.
Not built-in, but the Sharp PC1500 pocket computer could take an add-on
battery-opperated plotter. The plotter was a craddle that the computer
slotted into, and it was _just_ possible to use it handheld. This used
the well-known Alps 4-pen mechanism (the narrow version of the one used
in the Radio Shack CGP115, Commodore 1520, etc).
And of course HP sold a full-size mains-operated plotter (7470 opt 003)
for the HP41 calculator (it worked with other HPIL controllers too, but
there's a ROM module for the HP41 to drive it). It's not common (yes, I
do have both the plotter and the ROM).
-tony