website/content/museum/casio-fx-702p.md

title, categories, types, origins, years, cpus, params

title	categories	types	origins	years	cpus	params
Casio FX-702P	Computers	Pocket	Japan	1981	4 bit CMOS LSI	name image company company_name specs tabs forum_thread photos adverts hardware links related oc_id source FX-702P /media/museum/photos/casio_fx702p_system_s1.jpg /companies/casio Casio label value NAME FX-702P label value MANUFACTURER Casio label value TYPE Pocket label value ORIGIN Japan label value YEAR 1981 label value END OF PRODUCTION Unknown label value BUILT IN LANGUAGE Basic interpreter label value KEYBOARD 65 keys, calculator type with alphanumeric keys (non-QWERTY) label value CPU 4 bit CMOS LSI, 4 x NEC D444G label value SPEED Unknown label value RAM 1680 bytes for BASIC plus 26 memories label value ROM Unknown label value TEXT MODES 1 line x 20 chars plus a 4 digit seven segment display part label value GRAPHIC MODES None label value COLORS Monochrome label value SOUND None label value SIZE / WEIGHT 165 (W) x 82 (D) x 17 (H) mm / 176 g (with batteries) label value I/O PORTS 7-pin expansion port for printer and cassette interface, 11-pin slot for memory module label value POWER SUPPLY 2 x CR-2032 lithium batteries label value PERIPHERALS FA-2 cassette interface\ FP-10 mini electro printer: electrostatic printer for 35 mm metallised paper label value PRICE 250 photos adverts hardware links 961 title subtitle text image FRONT VIEW Roman Von Wartburg /media/museum/photos/casio_fx702p_keyboard_s1.jpg title subtitle text image KEYBOARD CLOSE-UP /media/museum/photos/casio_fx702p_keybcloseup_s1.jpg title subtitle text image BOTTOM SIDE **(1)** Batteries housing\ **(2)** RAM module connector\ **(3)** Expansion port /media/museum/photos/casio_fx702p_bottomside_s1.jpg title subtitle text image INSIDE **(1)** Display driver chips\ **(2)** Four NEC CMOS LSI chips in charge of CPU functions, ROM and RAM memory and I/O ports\ **(3)** Expansion connector\ **(4)** LCD contrast knob /media/museum/photos/casio_fx702p_inside_s1.jpg title subtitle text image MANUALS The FX-702P vas delivered with a user manual and a very useful program library gathering more than 70 programs and complex calculations /media/museum/photos/casio_fx702p_manuals_s1.jpg title subtitle text image THE BOX Both sides of the FX-702 box. /media/museum/photos/casio_fx702p_box_s1.jpg title subtitle text image FRENCH ADVERT (MAY 1982) "Computing pret-a-porter" "Casio FX-702P : pocket Basic" "Casio, it counts" /media/museum/pubs/casio_fx702p_pub_3.jpg title subtitle text image FRENCH ADVERT (DEC. 1983) "Basic, It is magic" /media/museum/pubs/casio_fx702p_pub_1.jpg title subtitle text image FRENCH ADVERT (DEC. 1982) "Christmas accounts" "Casio, it counts" /media/museum/pubs/casio_fx702p_pub_2.jpg title subtitle text image FA-2 INTERFACE FA-2 tape recorder interface /media/museum/hardware/casio_fx702p_fa2interface_s1.jpg title subtitle text image FP-10 PRINTER The FP-10 Mini Electro Printer can be connected to the FX-601P/602P and FX-702P computers. It uses metalized paper rolls and prints 20 characters per line. /media/museum/hardware/casio_fx702p_fp10printer_s1.jpg title url text Silrun Systems http://www.silrun.info/ Documentations to download for Casio pockets ! Useful. title url text The Pocket Computer Museum http://pocket.free.fr/ The site to visit for pockets computers ! /museum/casio-fx-700p /museum/casio-pb-100 /museum/casio-pb-300 987 url date https://web.archive.org/web/20230605041544/http://www.old-computers.com/museum/computer.asp?c=987 2023-06-05

The FX-702P was Casio's answer to Sharp's PC-121x series. In certain ways, this machine marks the transition from keystroke programmables such as the FX-601P/602P to "real" pocket computers. On the one hand, Casio labeled the FX-702P only as "Programmable Calculator", and its non-QWERTY layout of the alphanumerical keys differentiate it from most later pocket computers. On the other hand, the FX-702P had a viable BASIC interpreter which allows for more flexible programming.

The hardware mainly consists of four CMOS LSI chips incorporating logical functions and memory, and four display driver chips. The display provides 20 characters in 5x7 pixel matrix, plus a separate 7-segment display part indicating the remaining program memory.

Comparable to the Sharp PC-1211 and 1212, the FX-702P had about 2 KB of RAM, divided into 1680 BASIC steps and 26 memories; more memory for variables could be partitioned out at the expense of BASIC memory. A memory expansion slot was built-in, but a suitable RAM module never came out.

With this model, Casio introduced their method of dividing program memory into 10 autonomous areas - P0 to P9 - which continued to be implemented in all following Casio models for many years.
The nonstandard keyboard makes it most cumbersome to use for anybody familiar with the QWERTY standard; on the other hand, triple assignments of most keys makes programming somewhat more efficient.

The built-in interpreter supports a variant of the BASIC language, with some keywords spelled in a different way than the later quasi-standard, e.g. PRT instead of PRINT, or GSB and RET for GOSUB and RETURN. Compared to Sharp's PC-121x models, it has substantially more mathematical and statistical functions, string manipulation functions and a more flexible variable handling scheme.

Two peripheral devices were available:
• The FA-2 Cassette Interface, which, as a side note, could also play musical notes when used with the FX-501P/FX-502P or FX-601P/602P calculators, but not with the FX-702P,
• The FP-10 Mini Electro Printer, a non-impact, electrostatic printer, which used special metalized paper.

Thanks to Roman von Wartburg and his site for this information.