PsION

The fx-602p released around 1982 is thought by many as the finest calculator Casio ever made. An evolution of the fx-502p with more memory and an alpha-numeric display. it was the last of the Casio step programmables and alpha was added to compete with the hp41c.  hereafter, Casio moved onto basic programmable pocket computers like the fx-700p, although for a time, this model was concurrent with the fx-702p which wasn't sure whether it was a pocket computer or a calculator.

the 10+2 display also accommodates 11 alpha characters consisting of upper and lower case letters together with many useful symbols. the display is clear for a dot matrix type. there is no external contrast control, but the display contrast could be adjusted with a potentiometer after opening the unit.

The unit is programmable with constant memory, totaling of 512 steps and 22 memories (M00-M19 plus MF and M1F). this number can be partitioned, trading in steps for more memories. between 22 and 80 memories are allowed corresponding to between 512 and 32 steps. the base memories cannot be converted into more steps than 512. When you altered the memory partition to gain more memory registers (at the cost of 8 program steps for each memory register), you always got an extra F Register for every 10 Memory registers. If you had M20-M29, you also got M2F as a bonus. Where this extra memory space came from, I don't know.

Programmability is the same as the fx-502p with a comprehensive set of instructions including  4 tests, isz & dsz (increment/decrement and jump if zero) for compact loops, labels, subroutines and indirect addressing. The original F Register (located at the EXP key) was used for number comparisons. There were 4 kinds of comparison: x=0, x?0, x=F and x?F. Although the F register played an important role, there was nothing special about the other F Registers.

Our FX-602P was kindly donated by John D'Arcy of Birmingham

Manufacturer: Casio
Date: 1982

Other Systems Related To PsION:

Item Manufacturer Date
Casio HR-110T Casio Unknown
Casio AL-2000 Programmable Calculator Casio 1970
Casio 121-U Calculator Casio 1973
Casio Personal-I (H802) Casio 1976
Casio AL-10 Electronic Calculator Casio 1976
Casio FX-110 Scientific Calculator Casio 1977
Casio AQ-1000 Calculator Casio 1978
Casio fx-180P Casio 1980
Casio fx-310 Casio 1980
Casio FX-720P Casio 1982
Casio MG-777 Casio 1982
Casio PB-110 Casio 1983
Casio FX-910 Casio 1984
Casio Mini-Card MC-34 Casio 1985
Casio FX-750P Casio 1985
Casio FX-7000G graphing calculator Casio October 1985
Casio FX-730P Casio 1986
Casio FX-570 Casio 1986
Casio FX-850P Casio 1987
Casio Digital Diary SF-4000 Casio November 1988
Casio FT-21 Fortune Telling Calculator Casio November 1988
Casio FX-82L Fraction Casio 1989
Casio FX-8500G calculator & FA-80 Interface Casio 1989
Casio BOSS - Buisness Organising Scheduling System Casio 1989
Casio fx-82SX Casio 1996
Casio CFX-9850GC Plus Calculator Casio 1996
Casio Digital Diary SF-4300A Casio 1997
Casio fx-83MS Casio 2000
Casio OH-300ES Casio 2012

This exhibit has a reference ID of CH6311. Please quote this reference ID in any communication with the Centre for Computing History.

 

PsION


Click on the Image(s) For Detail


Help support the museum by buying from the museum shop

View all items

Founding Sponsors
redgate Google ARM Real VNC Microsoft Research
Heritage Lottery Funded
Heritage Lottery Fund
Accredited Museum