Ring counter (English Wikipedia)

Lyon, Richard F. (August 1981), The Optical Mouse, and an Architectural Methodology for Smart Digital Sensors (PDF) (Report), Palo Alto Research Center, Palo Alto, California, USA: Xerox Corporation, VLSI 81-1, archived (PDF) from the original on 2020-05-23, retrieved 2020-05-23, The counters needed for X and Y simply count through four states, in either direction (up or down), changing only one bit at a time (i.e., 00, 01, 11, 10). This is a simple case of either a Gray-code counter or a Johnson counter (Moebius counter). (41 pages)

books.google.com

Pedroni, Volnei A. (2013). Finite State Machines in Hardware: Theory and Design. MIT Press. p. 50. ISBN 978-0-26201966-8.
Mengibar, Luis; Entrena, Luis; Lorenz, Michael G.; Sánchez-Reillo, Raúl (2003). "State Encoding for Low-Power FSMs in FPGA". Integrated Circuit and System Design. Power and Timing Modeling, Optimization and Simulation: Proceedings of the 13th International Workshop, PATMOS 2003, Torino, Italy, 10–12 September 2003. Vol. 13. Springer Science & Business Media. p. 35. ISBN 9783540200741.
Holdsworth, Brian; Woods, Clive (2002). Digital Logic Design (4 ed.). Newnes Books / Elsevier Science. pp. 191–192. ISBN 0-7506-4588-2. Retrieved 2020-04-19.{{cite book}}: CS1 maint: ignored ISBN errors (link) (519 pages) [1]
Lewis, Wilfrid Bennett (1942). Electrical Counting: With Special Reference to Counting Alpha and Beta Particles. Cambridge University Press. p. 90. ISBN 9781316611760.
Electrical Technology - A Suggested 2-Year Post High School Curriculum. Technical Education Program Series. United States, Division of Vocational and Technical Education. 1960. p. 52.
Randall, Brian (2014). "The Origins of Digital Computers: Supplementary Bibliography". In Metropolis, Nicholas (ed.). History of Computing in the Twentieth Century. Elsevier. pp. 651–652. ISBN 9781483296685.
Langholz, Gideon; Kandel, Abraham; Mott, Joe L. (1998). Foundations of Digital Logic Design. World Scientific. pp. 525–526. ISBN 978-9-81023110-1.
Dokter, Folkert; Steinhauer, Jürgen (1973-06-18). Digital Electronics. Philips Technical Library (PTL) / Macmillan Education (Reprint of 1st English ed.). Eindhoven, Netherlands: The Macmillan Press Ltd. / N. V. Philips' Gloeilampenfabrieken. p. 43. doi:10.1007/978-1-349-01417-0. ISBN 978-1-349-01419-4. SBN 333-13360-9. Retrieved 2020-05-11. (270 pages)

cranfield.ac.uk

dspace.lib.cranfield.ac.uk

Powell, E. Alexander (June 1968). "Codes particularly useful for analogue to digital conversions". A short note on useful codes for Fluidic Control Circuits (PDF). Cranfield, UK: The College of Aeronautics, Department of Production Engineering. p. 10. S2CID 215864694. CoA Memo 156. Archived (PDF) from the original on 2020-12-15. Retrieved 2020-12-15. (18 pages) (NB. The paper names the Glixon code modified Gray code and misspells Richard W. Hamming's name.)

daytoncodebreakers.org

Dayton Codebreakers: 1942 Research Report, mentioning "A new high speed counter by Mr. Overbeck, January 8, 1942"

doi.org

Libaw, William H.; Craig, Leonard J. (October 1953) [September 1953]. "A Photoelectric Decimal-Coded Shaft Digitizer". Transactions of the I.R.E. Professional Group on Electronic Computers. EC-2 (3): 1–4. doi:10.1109/IREPGELC.1953.5407731. eISSN 2168-1759. ISSN 2168-1740. Retrieved 2020-05-26. (4 pages)
Dokter, Folkert; Steinhauer, Jürgen (1973-06-18). Digital Electronics. Philips Technical Library (PTL) / Macmillan Education (Reprint of 1st English ed.). Eindhoven, Netherlands: The Macmillan Press Ltd. / N. V. Philips' Gloeilampenfabrieken. p. 43. doi:10.1007/978-1-349-01417-0. ISBN 978-1-349-01419-4. SBN 333-13360-9. Retrieved 2020-05-11. (270 pages)

ed-thelen.org

RAMAC 305 - IBM Customer Engineering Manual of Instruction (PDF). IBM. 1959. […] The Overbeck ring is used to supply timed pulses within computer circuits much as cam operated circuit breakers supply timed pulses on mechanical machines. It consists of a set of triggers with a common input from the ring drive line which carries pulses supplied by the process drum. […] Initially the triggers are reset OFF with the exception of the home trigger, which is ON. Each negative input pulse will turn OFF the trigger that is ON. The fall of the voltage at pin 10 of the trigger being turned OFF will grid flip the next trigger ON. This continues through a closed ring […]

loc.gov

lccn.loc.gov

Steinbuch, Karl W., ed. (1962). Written at Karlsruhe, Germany. Taschenbuch der Nachrichtenverarbeitung (in German) (1 ed.). Berlin / Göttingen / New York: Springer-Verlag OHG. pp. 71–72, 74. LCCN 62-14511.
Steinbuch, Karl W.; Wagner, Siegfried W., eds. (1967) [1962]. Taschenbuch der Nachrichtenverarbeitung (in German) (2 ed.). Berlin, Germany: Springer-Verlag OHG. LCCN 67-21079. Title No. 1036.
Steinbuch, Karl W.; Weber, Wolfgang; Heinemann, Traute, eds. (1974) [1967]. Taschenbuch der Informatik – Band II – Struktur und Programmierung von EDV-Systemen (in German). Vol. 2 (3 ed.). Berlin, Germany: Springer Verlag. ISBN 3-540-06241-6. LCCN 73-80607. {{cite book}}: |work= ignored (help)

patents.google.com

"Electronic accumulation", Robert E. Mumma's US Patent No. 2405096, filed in 1941
"Electronic switching device", Wilcox P. Overbeck's US Patent No. 2427533, filed in 1943
William Alfred Higinbotham, "Fast impulse circuits", US Patent No. 2536808, filed in 1949
Robert Royce Johnson, "Electronic counter", US Patent No. 3030581, filed in 1953

researchgate.net

Libaw, William H.; Craig, Leonard J. (October 1953) [September 1953]. "A Photoelectric Decimal-Coded Shaft Digitizer". Transactions of the I.R.E. Professional Group on Electronic Computers. EC-2 (3): 1–4. doi:10.1109/IREPGELC.1953.5407731. eISSN 2168-1759. ISSN 2168-1740. Retrieved 2020-05-26. (4 pages)

semanticscholar.org

api.semanticscholar.org

Powell, E. Alexander (June 1968). "Codes particularly useful for analogue to digital conversions". A short note on useful codes for Fluidic Control Circuits (PDF). Cranfield, UK: The College of Aeronautics, Department of Production Engineering. p. 10. S2CID 215864694. CoA Memo 156. Archived (PDF) from the original on 2020-12-15. Retrieved 2020-12-15. (18 pages) (NB. The paper names the Glixon code modified Gray code and misspells Richard W. Hamming's name.)

tinaja.com

Don Lancaster. "TV Typewriter Cookbook". (TV Typewriter). 1976. p. 180-181.

web.archive.org

Holdsworth, Brian; Woods, Clive (2002). Digital Logic Design (4 ed.). Newnes Books / Elsevier Science. pp. 191–192. ISBN 0-7506-4588-2. Retrieved 2020-04-19.{{cite book}}: CS1 maint: ignored ISBN errors (link) (519 pages) [1]
van Holten, Cornelius (August 1982). Written at Delft Technical University, Delft, Netherlands. "Digital dividers with symmetrical outputs - The author uses Johnson counters with controlled feedback to give symmetrical even and odd-numbered divisions of a clock pulse" (PDF). Wireless World. Vol. 88, no. 1559. Sutton, Surrey, UK: IPC Business Press Ltd. pp. 43–46. ISSN 0043-6062. Archived (PDF) from the original on 2021-02-21. Retrieved 2021-02-20. [2] [3] (4 pages)
Lyon, Richard F. (August 1981), The Optical Mouse, and an Architectural Methodology for Smart Digital Sensors (PDF) (Report), Palo Alto Research Center, Palo Alto, California, USA: Xerox Corporation, VLSI 81-1, archived (PDF) from the original on 2020-05-23, retrieved 2020-05-23, The counters needed for X and Y simply count through four states, in either direction (up or down), changing only one bit at a time (i.e., 00, 01, 11, 10). This is a simple case of either a Gray-code counter or a Johnson counter (Moebius counter). (41 pages)
Powell, E. Alexander (June 1968). "Codes particularly useful for analogue to digital conversions". A short note on useful codes for Fluidic Control Circuits (PDF). Cranfield, UK: The College of Aeronautics, Department of Production Engineering. p. 10. S2CID 215864694. CoA Memo 156. Archived (PDF) from the original on 2020-12-15. Retrieved 2020-12-15. (18 pages) (NB. The paper names the Glixon code modified Gray code and misspells Richard W. Hamming's name.)

worldcat.org

search.worldcat.org

van Holten, Cornelius (August 1982). Written at Delft Technical University, Delft, Netherlands. "Digital dividers with symmetrical outputs - The author uses Johnson counters with controlled feedback to give symmetrical even and odd-numbered divisions of a clock pulse" (PDF). Wireless World. Vol. 88, no. 1559. Sutton, Surrey, UK: IPC Business Press Ltd. pp. 43–46. ISSN 0043-6062. Archived (PDF) from the original on 2021-02-21. Retrieved 2021-02-20. [2] [3] (4 pages)
Libaw, William H.; Craig, Leonard J. (October 1953) [September 1953]. "A Photoelectric Decimal-Coded Shaft Digitizer". Transactions of the I.R.E. Professional Group on Electronic Computers. EC-2 (3): 1–4. doi:10.1109/IREPGELC.1953.5407731. eISSN 2168-1759. ISSN 2168-1740. Retrieved 2020-05-26. (4 pages)

worldradiohistory.com

van Holten, Cornelius (August 1982). Written at Delft Technical University, Delft, Netherlands. "Digital dividers with symmetrical outputs - The author uses Johnson counters with controlled feedback to give symmetrical even and odd-numbered divisions of a clock pulse" (PDF). Wireless World. Vol. 88, no. 1559. Sutton, Surrey, UK: IPC Business Press Ltd. pp. 43–46. ISSN 0043-6062. Archived (PDF) from the original on 2021-02-21. Retrieved 2021-02-20. [2] [3] (4 pages)