The FX-601P and FX-602P were

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 ...

s, 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 1981. It was the successor model to the

Casio FX-502P series The FX-501P and FX-502P were programmable calculators, manufactured by Casio from 1978/1979. They were the predecessors of the '' FX-601P'' and '' FX-602P''. It is likely that the FX-501P/502P were the first LCD programmable calculators to be pro ...

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 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 ...

. 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.

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 The FX-702P is a Pocket Computer, manufactured by Casio from 1981 to 1984. Display The FX-702P features a single line dot matrix liquid crystal display with 20 characters. A 10-digit mantissa is displayed (including minus sign) however internal ...

. Both interfaces featured 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. The FA-2 Interface was used the FX-602P series of

and the FX-702P

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 ...

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 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. It w ...

printer.The Casio FA-2 Tape interface
The pocket computer museum

Display

Programming

Programming example

Interface

References

External links