Read-mostly memory

Read-mostly memory (RMM) is a type of memory that can be read fast, but written to only slowly.

Historically, the term was used to refer to different types of memory over time:

In 1970, it was used by Intel and Energy Conversion Devices to refer to a new type of amorphous and crystalline nonvolatile and reprogrammable semiconductor memory (phase-change memory aka PCM/PRAM). However, it was also used to refer to reprogrammable memory (REPROM) and magnetic-core memory.

The term has mostly fallen into disuse, but is sometimes used referring to electrically erasable programmable read-only (EEPROM) or flash memory today.

References

{{Reflist|refs=

{{cite book |title=Digitale Rechenautomaten – Eine Einführung in die Struktur von Computerhardware |language=de |trans-title=Digital Computers – An Introduction into the structure of computer hardware |chapter=Tabelle 6.2 Beispiele mikroprogrammierter Rechner |trans-chapter=Table 6.2 Examples of micro-programmed computers |author-first=Rainer |author-last=Klar |publisher=Walter de Gruyter & Co. |location=Berlin, Germany |series=Sammlung Göschen |volume=2050 |date=1989 |orig-year=1988-10-01 |isbn=3-11011700-2 |page=223 |edition=4th reworked |quote=[…] Honeywell H4200 […] 1966 […] Kernspeicher […] 2 Kerne/Bit […] RMM: Read-mostly-Memory, d.h. Speicher mit langsame[m] Schreiben, aber schnellem Lesen […]}} (320 pages)

{{cite book |title=Rechnerarchitektur: Grundlagen und Verfahren |language=de |author-first1=Arndt |author-last1=Bode |author-link1=:de:Arndt Bode |author-first2=Wolfgang |author-last2=Händler |author-link2=Wolfgang Händler |publisher=Springer-Verlag |publication-place=Berlin / Heidelberg, Germany; New York, USA |location=Erlangen, Germany |date=1980 |edition=1 |isbn=3-540-09656-6 |page=102 |url=https://books.google.com/books?id=22igBgAAQBAJ&pg=PA102 |access-date=2020-07-01 |quote=[…] RMM (Read mostly memory) oder REPROM (Reprogrammable memory): Semifestspeicher, bei denen das Schreiben möglich, jedoch wesentlich aufwendiger als das Lesen ist (meist um einige Zehnerpotenzen). […]}} (xii+278+2 pages)

{{cite magazine |title=Nonvolatile and reprogrammable, the read-mostly memory is here |author-first1=Ronald "Ron" G. |author-last1=Neale |author-first2=D. L. |author-last2=Nelson |author-first3=Gordon Earle |author-last3=Moore |author-link3=Gordon Earle Moore |date=1970-09-28 |magazine=Electronics |publisher=McGraw-Hill |s2cid=137556114 |pages=56–60 |url=https://objective-analysis.com/uploads/Electronics%201970%20Neale%20Nelson%20Moore.pdf |access-date=2020-07-01 |archive-date=2022-07-07 |archive-url=https://web.archive.org/web/20220707201607/https://objective-analysis.com/uploads/Electronics%201970%20Neale%20Nelson%20Moore.pdf |url-status=dead }}

{{cite web |title=Original PCM Article from 1970 |author-first=Jim |author-last=Handy |date=2018-01-17 |work=The Memory Guy, Objective Analysis, Semiconductor Market Research |url=https://thememoryguy.com/original-pcm-article-from-1970/#more-1658 |access-date=2020-07-01 |url-status=live |archive-url=https://web.archive.org/web/20200701183007/https://thememoryguy.com/original-pcm-article-from-1970/ |archive-date=2020-07-01}}

{{cite web |title=Read Mostly Memory |author-first=Dave |author-last=Astels |date=2020-07-01 |orig-year=2018-05-02 |work=adafruit |url=https://learn.adafruit.com/digital-circuits-5-memories/read-mostly-memory |access-date=2020-07-01 |url-status=live |archive-url=https://web.archive.org/web/20200701182146/https://learn.adafruit.com/digital-circuits-5-memories/read-mostly-memory |archive-date=2020-07-01}}

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Read-mostly memory

See also

References

Further reading