4-bit computing: Difference between revisions

Revision as of 17:45, 3 April 2023

Revision as of 17:48, 3 April 2023

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== History ==

[[File:Alps remote control BHR970001B - NEC D63GS-7525.jpg|thumb|20-pin PSOP| - NEC D63GS: a 4-bit microcontroller for [[infrared remote control]] transmission]]

[[File:Intel C4004 greytraces CPU.jpg|thumb|left|16-pin DIP| - Intel C4004]]

[[File:Olympia CD700 Desktop Calculator. 1971.Microprogrammable Arithmetic Processor System Devices (MAPS).jpg|thumb|Olympia CD700 Desktop Calculator using the National Semiconductor MAPS MM570X [[bit-serial]] 4-bit microcontroller]]

[[File:Alps remote control BHR970001B-7517.jpg|thumb|left|Infrared remote control PCB| - an [[infrared remote control]] transmitter controlled by a NEC D63GS 4-bit microcontroller]]

Some of the first [[microprocessor]]s had a 4-bit word length and were developed around 1970. The first commercial microprocessor was the [[binary-coded decimal]] (BCD-based) [[Intel 4004]],<ref name="Mack_2005" /><ref name="Hofstra_History" /> developed for calculator applications in 1971; it had a 4-bit word length, but had 8-bit instructions and 12-bit addresses. It was succeeded by the [[Intel 4040]].