====== National Semiconductor ======

  * [[https://de.wikipedia.org/wiki/National_Semiconductor]]


===== MAPS (MM570x) - National Semiconductor =====

//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.//

  * [[https://en.wikichip.org/wiki/national_semiconductor/maps|MAPS (MM570x) - National Semiconductor]]
  * [[http://www.bitsavers.org/components/national/_dataBooks/1972_National_MOS_Integrated_Circuits.pdf]]


==== Das Rechenwerk "Olympia CD700 M71" ====

  * [[https://youtu.be/8LnCGahnhb4|Einzigartiges Rechenwerk: Olympia CD700 | Vintage Rechenmaschine]]
    * national semiconductors **MAPS** (Microprogrammable Arythmetic Processor System)
    * besteht aus
      * MM5700 - ALU (max. 750 kHz)
      * MM5701 - register 
      * MM5702 - timing and control unit
      * MM5703 - control ROM (extension)
      * MM5704 - keyboard interface unit
      * MM5705 - control ROM
      * MM5706 - static Data Monitor