The MAPS (Microprogrammable Arithmetic Processor System)
or National MM570X was a system made of 5 discrete chips designed by National Semiconductor that can be programmed to operate in binary or BCD up to a 76 bit one cycle data word.
The chipset was marketed as a general purpose serial data microcomputer system and was introduced in late 1971.
MM5700CA/D
MM5703CC/D
MM5704CB/D
MM5703CB/D
MM5703CA/D
MM5702CA/D
MM5701CB/D
MM5701
Various old ex-USSR chips
K5ЯП 011001
K5ИЛ 011
K5ЖЛ 012
K5TK011
The set of 4 Rockwell LSI circuits used in
Sharp EL-8 The First Portable Electronic Calculator
NRD2256
DC2266
AU2271
AC2261
The set of 4 SANYO LSI circuits used in Sanyo ICC-0081 "Mini Calculator"
This was one of the first hand-held calculators, being launched in Japan in spring 1970
The set of 3 TEXAS INSTRUMENTS LSI circuits used in
Canon Pocketronic calculator, the first "handheld" battery-powered printing electronic calculator.
The Pocketronic was also one of the earliest calculators to use Large Scale Integrated (LSI) Circuits.
No display, printout on thermal paper tape. A total of three LSI circuits made by Texas Instruments was necessary to do the four basic calculations with numbers of 6 to 12 digits.
Back