Casio FX-602P series

CASIO FX-602P series

A 28-year-old FX-602P in working condition
Type Programmable Scientific
Manufacturer Casio
Introduced 1981
Discontinued 1989
Calculator
Entry mode Infix
Precision 12 digits mantissa, ±99 exponent
Display type LCD Dot-matrix
Display size 11 Characters + 3 digits
Programming
Programming language(s) Keystroke (fully merged, Turing complete)
Memory register 11 (FX-601P) 22 .. 88 (FX-602P)
Program steps 128 (FX-601P) 32 .. 512 (FX-602P)
Interfaces
Ports one vendor specific
Connects to

Compact Cassette via one of:

FP-10 Thermal printer via one of:

Other
Power supply 2×"CR-2032" Lithium
Weight 141g, 5 oz
Dimensions 15.24x7,6x1.2 cm, 6"×3"×½"

The FX-601P and FX-602P were programmable calculators, manufactured by CASIO from 1981. It was the successor model to the Casio FX-502P series and was itself succeeded in 1990 by the Casio FX-603P.

Display

The FX-601P series featured a single line dot matrix display with 11 characters as main display. An additional 3 digits 7-segment display used to display exponents as well as program steps when entering or debugging programs. There were 11 status indicators.

Programming

The programming model employed key stroke programming by which each key pressed was recorded and later played back. On record, multiple key presses were merged into a single programming step. Only a few operations needed two bytes.[1] Synthetic programming was possible but not very common[2]

The FX-601P could store 128 fully merged steps and data could be stored in 11 memory register. The memory of the FX-602P could be partitioned between from 32 to 512 fully merged steps and data could be stored in 22 to 88 memory register. The default set-up was 22 register and 512 steps. From there one could trade 8 steps for one additional register or 80 steps for 11 register with the 11th register begin a so-called "F" register.

Like its predecessor the FX-602P series supported 10 labels for programs and subroutines called P0 .. P9. Each program or subroutine could have up to 10 local labels called LBL0 .. LBL9 for jumps and branches.

The FX-601P and FX-602P supported indirect addressing both for memory access and jumps and therefore programming model could be considered Turing complete.

Both the FX-601P and FX-602P could load and execute programs from the predecessors.

Programming example

This program computes the factorial of an integer number from 2 to 69. For 5!, the user enters 5 P0 to produce the result, 120. The program occupies 9 bytes of memory.

Key-code Comment
P0 You'll call the program with the P0 key
Min00 stores the value in register 0
1 starts with 1
LBL0 label for the loop
* multiply
MR00 by n
DSZ GOTO0 décrements M00 and back to LBL0 until M00=0
= end of loop, the machine has calculated

Interface

Casio FA-2
Connects to

FX-602P series and FX-702P Compact Cassette via one of:

Manufacturer Casio
Introduced 1981
Type Compact Cassette Interface

The FX-601P and FX-602P used the same FA-1 interface as used by the FX-502P line of calculators or alternatively the newer FA-2 interface which was also used by Casio FX-702P. Both interfaces featured a Kansas City standard Compact Cassette interface.

The FA-2 Interface was used the FX-602P series of programmable calculator and the FX-702P Pocket Computer to store programs and data register to Compact Cassette. When compared with its predecessor the Casio FA-1 the FA-2 featured an additional tape control output and connector for the Casio FP-10 printer.[3]

References

  1. ↑ Martin Krischik FX-602P Token list Martin Krischik Software Development.
  2. ↑ Dr. K. Miyahara, (2008) Synthetic Programming on the FX-602P.
  3. ↑ http://pocket.free.fr/html/casio/fa-2_e.html
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