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Casio fx-502P — I2C expansion possibilities
02-24-2022, 11:21 PM
Post: #1
Casio fx-502P — I2C expansion possibilities
https://hackaday.com/2022/02/21/i2c-brea...alculator/

Cambridge, UK
41CL/DM41X 12/15C/16C DM15/16 17B/II/II+ 28S 42S/DM42 32SII 48GX 50g 35s WP34S PrimeG2 WP43S/pilot
Casio, Rockwell 18R
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02-28-2022, 10:52 AM
Post: #2
RE: Casio fx-502P — I2C expansion possibilities
Nice find. Most of those hacks might work with the whole family - 501, 502, 601, 602. Those are very, very nice calculators, too.
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02-28-2022, 04:51 PM
Post: #3
RE: Casio fx-502P — I2C expansion possibilities
The board works with the 501 and 502. The 601/602 uses the same interface hardware but a slightly different command set. This is a bit odd as they both talk to the same peripherals. My 502s are more reliable than my 602s and so I developed the code on them. I'll probably have a go at getting a 602 working as well if i can keep one working long enough.

Andrew
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03-01-2022, 12:38 PM
Post: #4
RE: Casio fx-502P — I2C expansion possibilities
Well, i have inherited the 602 including printer and tape interface and such from my father. it should be about 40odd years old now and still works perfectly.
i also sold another 602 a while ago which did work fine, too.
my 502 and 501 both work equally well so i cannot tell of any failures in this family.
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