Scientific calculators that have formula/equation memory

[pier4r]

@massimo. Only 144mm ? That's is a golden god!

@grsbanks: good point! Has the dm15 still around ~400 bytes of memory for programs (and therefore formulas)?


Recap:
Hp35s. ~ 30K of ram
Casio fx5800P (the dimensions should be there, although it seems a graphing model). ~ 25K of ram.
swissmicro DM42 (with a bit more effort to use programs as formulas).
swissmicro DM15 with registers and program memory (program as formulas) ~1500 bytes program memory, see below.
Many sharp models have 9 memories and 4 formula memories.


hp35s : 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 .
6.22 or 6.4 is still like a big phone.
DM42: 144mm*77mm
DM15: 88mm*59mm
Sharp models: round about 160mm*80mm

Any other suggestion is welcomed.