Scientific calculators that have formula/equation memory

[pier4r]

Recap after surfing on the major producers (TI, HP, Casio, Sharp), given the limits stated above.

Hp35s. ~ 30K of ram
Casio fx5800P (the dimensions should be there, although it seems a graphing model). ~ 25K of ram.
Many sharp models have 9 memories and 4 formula memories.
DM42 (with a bit more effort to use programs as formulas).

Note that the hp35s has the two largest dimensions being: 6.22' x 3.23' in freedom units or in real units: 15.80 cm x 8.2 cm
Casio fx5800P: 6.4 x 3.2 .
Ti graphing (or HP and others), overblown with 7+ inches. One inch seems not much, but not in this case.
6.22 or 6.4 is still like a big phone.
DM42: can someone measure it?

Any other suggestion is welcomed.