The FX-603P was a

programmable calculator Programmable calculators are calculators that can automatically carry out a sequence of operations under control of a stored program. Most are Turing complete, and, as such, are theoretically general-purpose computers. However, their user inter ...

, manufactured by

Casio is a Japanese multinational electronics manufacturing corporation headquartered in Shibuya, Tokyo, Japan. Its products include calculators, mobile phones, digital cameras, electronic musical instruments, and analogue and digital watches. I ...

from 1990. It was the successor model to the

Casio FX-602P 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 l ...

. Since it was only released in a limited number of countries in small quantities, it is now an excessively rare item which commands high prices when sold.

Display

The FX-603P featured a two line dot matrix display with 16 characters each as main display. An additional 4 digits 7-segment display used to display the program step when entering or debugging programs and 20 status indicators.

Programming

The programming model employed was 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. There were only a very few operations which needed two bytes. The FX-603P could store 6,144 steps. Data could be stored in 110 memory register. The FX-603P series supported 20 labels for programs and subroutines called P0 .. P19 - twice the amount of the predecessor models. Each program or subroutine could have up to 10 local labels called LBL0 .. LBL9 for jumps and branches. The FX-603P supported indirect addressing both for memory access and jumps and therefore programming model could be considered

Turing complete Alan Mathison Turing (; 23 June 1912 – 7 June 1954) was an English mathematician, computer scientist, logician, cryptanalyst, philosopher, and theoretical biologist. Turing was highly influential in the development of theoretical co ...

. The FX-603P was backward-compatible with the FX-602P could load FX-602P programs from Compact Cassette.

Programming example

Here is a sample program that computes the factorial of an integer number from 2 to 69. For 5!, you'll type 5 P0 and get the result, 120. With the additional alpha output the program is 14 byte long.

Interface

The FX-603P used the same FA-6 interface as used by the Casio FX-840P, Casio FX-841P,

Casio FX-850P The Casio FX-850P is a scientific calculator introduced in 1987 and sold until 1999. Specifications * 2 lines with 32 5×7 characters LCD ** (some indicators and a 5 digit 7-segment display) * 8 KB RAM (FX-860P: 24 KB, FX-880P: 32 KB) * CPU: V ...

, Casio FX-860P, Casio FX-860Pvc, Casio FX-870P, Casio FX-880P, Casio FX-890P, Casio VX-1, Casio VX-2, Casio VX-3, Casio VX-4, Casio Z-1 and Casio Z-1GR

and

pocket computer A pocket computer was a 1980s-era user programmable calculator-sized computer that had fewer screen lines, Some had only one line and often fewer characters per line, than the Pocket-sized computers introduced beginning in 1989. Manufacturers i ...

s. This interface features a

Kansas City standard The Kansas City standard (KCS), or ''Byte'' standard, is a data storage protocol for standard cassette tapes at . It originated in a symposium sponsored by ''Byte'' magazine in November 1975 in Kansas City, Missouri to develop a standard for th ...

Compact Cassette interface, a Centronics printer port and a

RS-232 In telecommunications, RS-232 or Recommended Standard 232 is a standard originally introduced in 1960 for serial communication transmission of data. It formally defines signals connecting between a ''DTE'' (''data terminal equipment'') such ...

interface.

Display

Programming

Programming example

Interface

References

External links