Casio 01 501 C
Casio 01 501 01
Casio 01 501 4

CASIO FX-501P / FX-502P
Type
Manufacturer	Casio
Introduced	1978
Calculator
Entry mode	Infix
Precision	12 digits mantissa, ±99 exponent
Display type
Display size	10 + 3 Digits
Programming
Programming language(s)	Keystroke(fully merged, Turing complete)
Memory register	11 (FX-501P), 22 (FX-502P)
Program steps	128 (FX-501P), 256 (FX-502P)
Interfaces
Ports	one vendor specific
Connects to	Compact Cassette via:
Other
Power supply	2×'G13' or 2×'LR44'
Power consumption	0.0008 W
Weight	141 g, 5 oz
Dimensions	15.24×7.6×1.2 cm, 6'×3'×½'

Casio Keyboard CTK-501 casioctk501.pdf: 1423 kB: 13: Casio: casio ctk501. 29/01/08: Realistic TRC-501 Voice Actuated FM Transceiver 21-401: 2441 kB: 690: Radio. With the FX-501P, Casio established itself as one of the few truly serious players in this highly competitive field. Casio watches’ most iconic collection for men is gaining immediate attention of every Tom, Dick, and Harry. With the precision put in the technology of the watch and the beguiling appearance it carries, Casio Edifice Watches are leading the race. Casio has always tried to create a world where time remains to be the most treasured possession. Manuals and User Guides for CASIO CTK-501. We have 3 CASIO CTK-501 manuals available for free PDF download: Service Manual, User Manual. Casio CTK-501 Service Manual (21 pages) Brand: Casio.

The FX-501P and FX-502P were programmable calculators, manufactured by Casio from 1978/1979.^{[citation needed]} 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 produced as up until 1979 (and the introduction of the HP-41C) no manufacturer had introduced such a device.

Arithmetic[edit]

The FX-502P series use the algebraic logic as was state of the art at the time.

Display[edit]

The FX-501P and FX-502P featured a single line 7-segment liquid crystal display with 10 digits as main display. An additional 3 digits 7-segment display used to display exponents and program steps when entering or debugging programs and 10 status indicators. The display was covered with a yellow filter, supposedly to prevent ultra-violet radiation damage to the unstable (at the time) Liquid Crystal compound.^{[citation needed]}

Programming[edit]

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. All operations fitted into one program step.^[1]

The FX-501P could store 128 steps, with 11 memory registers. The FX-502P had twice that capacity with 256 steps and 22 memory registers.

Conditional and unconditional jumps as well as subroutines were supported. The FX-502P 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-501P and FX-502P supported indirect addressing both for memory access and jumps and therefore the programming model could be considered Turing complete.

Since the FX-501P and FX-502P only employed a seven-segment display each program step was represented by a special 2-digit codes made up of the digits 0 .. 9 and the character C, E, F and P. The calculator came with a special overlay^[2] so the user did not need to memorize the mapping between code and actual command.

What differentiated the FX-501 / FX-502P from its competitors was that programming was retained in a battery-buffered memory when the calculator was turned off.

Programming example[edit]

Here is a sample program that computes the factorial of an integer number from 2 to 69. For 5!, the user would type 5P0 and get the result 120. The whole program is only 9 bytes long.

Key-code	Display-code	Comment
`P0`	P0	call the program with the P0 key
`Min0`	C6-00	stores the value in register 0
`1`	01	starts with 1
`LBL0`	F0-00	label for the loop
`*`	E1	multiply
`MR0`	C7-00	with M0
`INVDSZ`	FF-01	Decrements M0 and skips next command if M0=Zero
`GOTO0`	F1-00	Go to LBL0
`=`	E5	end of loop, the machine has calculated $1 \times n \times (n - 1) \times \dots \times 2 \times 1 = n! {displaystyle 1times ntimes (n-1)times cdots times 2times 1=n!}$

Interface[edit]

Casio *FA-1*
Connects to	FX-502P series and FX-602P series Compact Cassette via one of: Line-Out: 3.5 mm TRS connector Mic-In: 3.5 mm TRS connector
Manufacturer	Casio
Introduced	1979
Type	Compact Cassette Interface

The FX-501P and FX-502P used the FA-1 to store program and data to Compact Cassette using the Kansas City standard. The FA-1 also enabled the calculators to generate musical notes.^[2]

Casio 01 501 C

Casio 01 501 01

The FX-501P was used on the 1981 song Pocket Calculator by electronic music group Kraftwerk.^[3]

References[edit]

^FX-602P Token list - the FX-502P series only employed the standard plane.
^ ^a^bcasio fx-501p with programming overlay
^'Pocket Calculator by Kraftwerk'. Songfacts. Retrieved 1 May 2020.

External links[edit]

FX-501P and FX-502P on casio.ledudu.com maintained by ledudu.
FX-501P and FX-502P on RS-Key maintained by Viktor Toth.
Casio FX-501P and Casio FX-502P on Voidware

Casio 01 501 4

Retrieved from 'https://en.wikipedia.org/w/index.php?title=Casio_FX-502P_series&oldid=991912779'