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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. Synthetic programming was possible but not very common

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
Template:Keypress	You'll call the program with the P0 key
Template:KeypressTemplate:KeypressTemplate:Keypress	stores the value in register 0
Template:Keypress	starts with 1
Template:KeypressTemplate:Keypress	label for the loop
Template:Keypress	multiply
Template:KeypressTemplate:KeypressTemplate:Keypress	by n
Template:Keypress Template:KeypressTemplate:Keypress	décrements M00 and back to LBL0 until M00=0
Template:Keypress	end of loop, the machine has calculated $1\times n\times (n-1)\times \cdots \times 2\times 1=n!$

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 featured an additional printer port for the FP-10 Thermal printer.

References

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External links

• FX-602P home page with in depth information and home of the FX-602P Simulator.
• FX-602P Sim a simulator for the iPhone and iPod touch.
• The Casio FX-602P calculator on the pocket computer museum
• Casio FX-602P on Caz Pocket Computers Collection
• FX-601P and FX-602P on RS-Key maintained by Viktor Toth.
• casio fx-602p on Voidware