Editing 4-bit computing (section)

== Uses ==
[[File:National_Semiconductor_COP410L_NGS_top_metal.jpg|thumb|National Semiconductor COP410L, a low-end 4-bit microcontroller. 512 bytes of ROM in upper left corner, 128 bits of RAM in upper right corner. Click to zoom.]]
One bicycle computer specifies that it uses a "4 bit, 1-chip microcomputer".<ref name="Cateye" /> Other typical uses include [[coffeemaker|coffee makers]], [[remote control|infrared remote controls]],<ref name="RenesasPD67" /> and [[security alarm]]s.<ref name="Haskell_MC" /><!-- "4-bit" or "4 bit" isn't actually in the source, 8-bit PIC is, and "Includes coffee makers, burglar alarms, TV remote controls, simple robots, etc." -->

The processor in Barbie typewriters that can encrypt is a 4-bit microcontroller.<ref>[https://www.cryptomuseum.com/crypto/mehano/barbie/ Paul Reuvers and Marc Simons. Crypto Museum. "Barbie Typewriter", 2015]</ref>

Several manufacturers used 4-bit microcontrollers in their early electronic games:<ref>{{cite web |title=National Semiconductor COP400 |url=http://seanriddle.com/cop400.html |publisher=Sean Riddle |access-date=24 December 2021}}</ref>
* [[Mattel|Mattel's]] Funtronics Jacks, Red Light Green Light, Tag, Plus One and Dalla$.
* [[Milton Bradley Company|Milton Bradley]] Lightfight and Electronic Battleship 1982. 
* [[Coleco]] Head to Head Basketball.
* National Semiconductor Quiz Kid Racer.
* [[Entex Industries|Entex]] Space Invader.
* [[Texas Instruments]] My Little Computer.<ref>{{cite web |last1=Woerner |first1=Joerg |title=Texas Instruments My Little Computer |url=http://www.datamath.org/Edu/MyLittleComputer.htm |website=Datamath Calculator Museum |access-date=19 June 2024}}</ref>
Western Digital used a 4-bit microcontroller as the basis for their WD2412 time-of-day clock.<ref>{{cite web |title=1983 Components Catalog |url=http://www.bitsavers.org/components/westernDigital/_dataBooks/1983_Western_Digital_Components_Catalog.pdf |page=621 |publisher=Western Digital |access-date=24 December 2021}}</ref>

The [[Grundy Newbrain]] computer uses a 4-bit microcontroller to manage its keyboard, tape I/O, and its built-in 16 character [[Vacuum fluorescent display|VF]] alphanumeric display.<ref>{{cite web |title=COP420 4-Bit Processor - Newbrain |url=https://www.newbrainemu.eu/el/specifications/newbrain/cop420-4-bit-processor.html |access-date=30 December 2021}}</ref>