Not to be confused with National MAPS (MM570X Series).

MM57XX Series

The National MM5700 or National MM57XX series a family of 4-bit calculator chips designed by National Semiconductor. The chips were made using pMOS technology, most designed for 9V battery, had an a very limited set of math operations - some only as few as addition, subtraction, multiplication, and division. These chips were made as part of National attempt to enter the ultra-low-end calculator market.

Family Members
Part	Description
MM5734	8-function accumulator calculator
MM5737	8-digit, 4-function floating point calculator
MM5758	Scientific Calculator
MM5760	Slide Rule Calculator
MM5762	Financial Calculator
MM5763	Statistical Calculator
MM5764	Conversion Calculator
MM5765	Calculator Programmer
MM5766	Calculator Programmer
MM5767	Slide Rule Calculator
MM5777	6-digit, 4-function, floating point calculator
MM5780	Educational toy calculator
MM5791	8-function accumulator calculator
MM5794	8-function accumulator VFD calculator
MM5795	8-function accumulator VFD calculator
MM57103	Scientific Calculator Circuit
MM57104	Scientific Calculator Circuit
MM57123	Scientific Calculator ROM
MM57136	RPN Scientific calculator control ROM

MM570X Series

The National MAPS (Microprogrammable Arithmetic Processor System) or National MM570X was a bit-serial 4-bit microcontroller system made of 5 discrete chips designed by National Semiconductor. The chipset was marketed as a general purpose serieal data microcomputer system. The chipset was introduced in late 1971. The MM570X is correlating to the Intel 4004, which also was developped as processor for an electronic desktop calculators.

Family Members
Part	Description
MM5700	ALU
MM5701	Register unit
MM5702	Clock and Control unit
MM5703	Control ROM (extension)
MM5704	Keyboard interface unit