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The FX-602p series
The CASIO FX-602p series
Find-it on ebay.com -
These series includes the oldest programmable pockets
Pocket computer from late 70's
First difference visible on the keyboard, the number of available brackets : 5 for the 501p, 10 for the 502p.
Then the [.] key has a second function  to give access to the ten memory registries.
The rest of the keyboard is identical on both calculators.
Third difference visible in mode 2 : 130 steps for the 501p, 255 for the 502p.
Programs on geocities.jp
With FA1 device for back up to tape.