Casio has released three models: 64 kbytes, 128 kbytes & 256 kbytes.
Depending on model they have some of these features with color displays:
sketch functions, memo, telephone, to-do, reminder, calendar/schedule,
calculator, expense manager, multi-lingual (5) & home/world time . They are
color screens
(no pen w/64k or 128 k) with a displays from 16 x 4 to 21 x 8 (characters by
lines) with a
cable to connect between devices only. The 256k uses a pen touch screen.
model numbers:
CSF-4650/CSF-4950 64 K NO PEN SCREEN 16 X 4
CSF-7950 128 K NO PEN SCREEN 16 X 8
NX-6000 256 K PEN TOUCH SCREEN 21 X 8