4-bit computing (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "4-bit computing" in English language version.

Last modified: 13:58:22, 20 September 2026 (UTC)

Ref.Un. Ref.Website

Global rank English rank

152bitsavers.org

3,844^th place

1,960^th place

1211web.archive.org

1^st place

54renesas.com

low place

33emmicroelectronic.com

low place

33atmel.com

low place

32righto.com

low place

22computerhistory.org

2,702^nd place

1,789^th place

11clemson.edu

6,422^nd place

3,771^st place

11hofstra.edu

low place

7,622^nd place

11kevtris.org

low place

11antiquetech.com

low place

11ultratechnology.com

low place

11rcsri.org

low place

11hpmuseum.org

low place

11grack.com

low place

11hpcalc.org

low place

11vintagecalculators.com

low place

11cateye.com

low place

11oakland.edu

low place

11cryptomuseum.com

low place

11seanriddle.com

low place

11datamath.org

low place

11newbrainemu.eu

low place

11visual6502.org

low place

11necel.com

low place

11embeddedinsights.com

low place

11emmarin.com

low place

11cpushack.com

low place

antiquetech.com (Global: low place; English: low place)

"Rockwell PPS-4".

atmel.com (Global: low place; English: low place)

"MARC4 4-bit Microcontrollers – Programmer's Guide" (PDF). Atmel. Archived from the original (PDF) on 2014-12-15. Retrieved 2014-01-14.
"MARC4 4-Bit Architecture". Atmel. Archived from the original on 2009-05-31.
"Product End-of-Life (EOL) Notification" (PDF). Atmel. 2014-03-07. Archived from the original (PDF) on 2016-08-07.

bitsavers.org (Global: 3,844^th place; English: 1,960^th place)

"1983 Components Catalog" (PDF). Western Digital. p. 621. Retrieved 2021-12-24.
Sharp Microcomputers Data Book (PDF). September 1990. Retrieved 2018-01-05.

cateye.com (Global: low place; English: low place)

"Cateye Commuter Manual" (PDF). Retrieved 2014-02-11.

clemson.edu (Global: 6,422^nd place; English: 3,771^st place)

Mack, Pamela E. (2005-11-30). "The Microcomputer Revolution". Retrieved 2009-12-23.

computerhistory.org (Global: 2,702^nd place; English: 1,789^th place)

archive.computerhistory.org

Shima, Masatoshi; Faggin, Federico; Ungermann, Ralph; Slater, Michael (2007-04-27). "Zilog Oral History Panel on the Founding of the Company and the Development of the Z80 Microprocessor" (PDF).
Hendrie, Gardner (2002-11-22). "Oral History of Edson (Ed) D. de Castro" (PDF) (Interview). p. 44.

cpushack.com (Global: low place; English: low place)

Culver, John (2014-09-27). "National Semiconductor: The COP before the COPS". www.cpushack.com. Retrieved 2020-05-28.

cryptomuseum.com (Global: low place; English: low place)

Paul Reuvers and Marc Simons. Crypto Museum. "Barbie Typewriter", 2015

datamath.org (Global: low place; English: low place)

Woerner, Joerg. "Texas Instruments My Little Computer". Datamath Calculator Museum. Retrieved 2024-06-19.

embeddedinsights.com (Global: low place; English: low place)

Cravotta, Robert. "Embedded Processing Directory".

emmarin.com (Global: low place; English: low place)

"EM6580". Archived from the original on 2013-12-19. Retrieved 2013-05-12.

emmicroelectronic.com (Global: low place; English: low place)

"Products". EM Microelectronic. Retrieved 2026-05-17.
"EM6580".
"EM6682".

grack.com (Global: low place; English: low place)

"Guide to the Saturn Processor". Retrieved 2014-01-14.

hofstra.edu (Global: low place; English: 7,622^nd place)

"History in the Computing Curriculum" (PDF). Archived from the original (PDF) on 2011-07-19. Retrieved 2017-06-22.

hpcalc.org (Global: low place; English: low place)

"Introduction to Saturn Assembly Language". Retrieved 2014-01-14.

hpmuseum.org (Global: low place; English: low place)

"The Saturn Processor". Retrieved 2015-12-23.

kevtris.org (Global: low place; English: low place)

blog.kevtris.org

TMS 1000 Series Data Manual (PDF). Texas Instruments. December 1976. Retrieved 2013-07-20.

necel.com (Global: low place; English: low place)

"Mask ROM/ROMless Products 4/8bit Remote Control". Archived from the original on 2008-10-28.

newbrainemu.eu (Global: low place; English: low place)

"COP420 4-Bit Processor - Newbrain". Retrieved 2021-12-30.

oakland.edu (Global: low place; English: low place)

cse.secs.oakland.edu

Haskell, Richard. "Introduction to Digital Logic and Microprocessors (Lecture 12.2)". Archived from the original on 2014-02-22. Retrieved 2014-02-11.

rcsri.org (Global: low place; English: low place)

"Nova 1200"

renesas.com (Global: low place; English: low place)

documentation.renesas.com

"μPD67, 67A, 68, 68A, 69 4-bit single-chip microcontroller for infrared remote control transmission" (PDF). documentation.renesas.com. Archived from the original (PDF) on 2016-01-06.
"μPD6P9 4-bit single-chip microcontroller for infrared remote control transmission" (PDF). documentation.renesas.com. Archived from the original (PDF) on 2016-03-27.
"μPD17240, 17241, 17242, 17243, 17244, 17245, 17246 4-bit single-chip microcontrollers for small general-purpose infrared remote control transmitters" (PDF). documentation.renesas.com. Archived from the original (PDF) on 2016-03-27.
"Microcontrollers for Remote Controllers" (PDF). documentation.renesas.com. Archived from the original (PDF) on 2013-12-19.

righto.com (Global: low place; English: low place)

Ken Shirriff. "Reverse engineering RAM storage in early Texas Instruments calculator chips".
Shirriff, Ken. "The Z-80 has a 4-bit ALU".

seanriddle.com (Global: low place; English: low place)

"National Semiconductor COP400". Sean Riddle. Retrieved 2021-12-24.

ultratechnology.com (Global: low place; English: low place)

"Forth Chips". www.ultratechnology.com.

vintagecalculators.com (Global: low place; English: low place)

"Desk Electronic Calculators: Casio AL-1000"

visual6502.org (Global: low place; English: low place)

"Apple Lisa 341-0064A (COP421)". Visual6502. Retrieved 2021-12-24.

web.archive.org (Global: 1^st place; English: 1^st place)

"History in the Computing Curriculum" (PDF). Archived from the original (PDF) on 2011-07-19. Retrieved 2017-06-22.
"μPD67, 67A, 68, 68A, 69 4-bit single-chip microcontroller for infrared remote control transmission" (PDF). documentation.renesas.com. Archived from the original (PDF) on 2016-01-06.
Haskell, Richard. "Introduction to Digital Logic and Microprocessors (Lecture 12.2)". Archived from the original on 2014-02-22. Retrieved 2014-02-11.
"MARC4 4-bit Microcontrollers – Programmer's Guide" (PDF). Atmel. Archived from the original (PDF) on 2014-12-15. Retrieved 2014-01-14.
"MARC4 4-Bit Architecture". Atmel. Archived from the original on 2009-05-31.
"Product End-of-Life (EOL) Notification" (PDF). Atmel. 2014-03-07. Archived from the original (PDF) on 2016-08-07.
"μPD6P9 4-bit single-chip microcontroller for infrared remote control transmission" (PDF). documentation.renesas.com. Archived from the original (PDF) on 2016-03-27.
"μPD17240, 17241, 17242, 17243, 17244, 17245, 17246 4-bit single-chip microcontrollers for small general-purpose infrared remote control transmitters" (PDF). documentation.renesas.com. Archived from the original (PDF) on 2016-03-27.
"Microcontrollers for Remote Controllers" (PDF). documentation.renesas.com. Archived from the original (PDF) on 2013-12-19.
"Mask ROM/ROMless Products 4/8bit Remote Control". Archived from the original on 2008-10-28.
"EM6580". Archived from the original on 2013-12-19. Retrieved 2013-05-12.

4-bit computing (English Wikipedia)

antiquetech.com (Global: low place; English: low place)

atmel.com (Global: low place; English: low place)

bitsavers.org (Global: 3,844th place; English: 1,960th place)

cateye.com (Global: low place; English: low place)

clemson.edu (Global: 6,422nd place; English: 3,771st place)

computerhistory.org (Global: 2,702nd place; English: 1,789th place)

archive.computerhistory.org

cpushack.com (Global: low place; English: low place)

cryptomuseum.com (Global: low place; English: low place)

datamath.org (Global: low place; English: low place)

embeddedinsights.com (Global: low place; English: low place)

emmarin.com (Global: low place; English: low place)

emmicroelectronic.com (Global: low place; English: low place)

grack.com (Global: low place; English: low place)

hofstra.edu (Global: low place; English: 7,622nd place)

hpcalc.org (Global: low place; English: low place)

hpmuseum.org (Global: low place; English: low place)

kevtris.org (Global: low place; English: low place)

blog.kevtris.org

necel.com (Global: low place; English: low place)

newbrainemu.eu (Global: low place; English: low place)

oakland.edu (Global: low place; English: low place)

cse.secs.oakland.edu

rcsri.org (Global: low place; English: low place)

renesas.com (Global: low place; English: low place)

documentation.renesas.com

righto.com (Global: low place; English: low place)

seanriddle.com (Global: low place; English: low place)

ultratechnology.com (Global: low place; English: low place)

vintagecalculators.com (Global: low place; English: low place)

visual6502.org (Global: low place; English: low place)

web.archive.org (Global: 1st place; English: 1st place)

bitsavers.org (Global: 3,844^th place; English: 1,960^th place)

clemson.edu (Global: 6,422^nd place; English: 3,771^st place)

computerhistory.org (Global: 2,702^nd place; English: 1,789^th place)

hofstra.edu (Global: low place; English: 7,622^nd place)

web.archive.org (Global: 1^st place; English: 1^st place)