JEIDA memory card

Before the advent of the JEIDA standard, laptops had proprietary cards that were not interoperable with other manufacturers laptops, other laptop lines, or even other models in the same line. The establishment of the JEIDA interface and cards across Japanese portables provoked a response from the US government, through SEMATECH,{{citation needed|date=September 2013|reason=According to my information backed up by RS, PCMCIA was founded on the initiative of Poqet's Ian Cullimore, who contacted Fujitsu and Intel in 1989.}} and thus PCMCIA was born. PCMCIA and JEIDA worked to solve this rift between the two competing standards, and merged into JEIDA 4.0 or PCMCIA 1.0 in 1990.

The JEIDA memory card was used in earlier ThinkPad models, where IBM branded them as IC DRAM Cards.{{Cite journal|last1=Martignano|first1=M.|last2=Harboe-Sorensen|first2=R.|date=December 1995|title=IBM Thinkpad radiation testing and recovery during EUROMIR missions|url=https://ieeexplore.ieee.org/document/489246|journal=IEEE Transactions on Nuclear Science|volume=42|issue=6|pages=2004–2009|doi=10.1109/23.489246|bibcode=1995ITNS...42.2004M |issn=0018-9499|url-access=subscription}}{{Cite web|title=IC DRAM Card - ThinkWiki|url=https://www.thinkwiki.org/wiki/IC_DRAM_Card|access-date=2021-05-12|website=Thinkwiki}}

The interface has also been used in SRAM cards.{{Cite web|url=https://www.simms.co.uk/wp-content/uploads/2015/09/PCMCIA-JEIDA-SRAM-Card-spec_V10_-2014_11_03.pdf|title=PCMCIA / JEIDA SRAM Card|access-date=2021-05-11|archive-date=2020-11-12|archive-url=https://web.archive.org/web/20201112021522/https://www.simms.co.uk/wp-content/uploads/2015/09/PCMCIA-JEIDA-SRAM-Card-spec_V10_-2014_11_03.pdf|url-status=dead}}

• Version 1.0 is an 88-pin{{Cite web|url=https://groups.csail.mit.edu/mac/ftpdir/thinkpad/old-archive/HTML/tp-1994/msg01270.html|title=Memory options from IBM|website=groups.csail.mit.edu}}{{Cite web|url=https://books.google.com/books?id=v9TVJ_G_sk8C&dq=ibm+thinkpad+jeida&pg=PA44|title=PC Mag|date=December 22, 1992|publisher=Ziff Davis, Inc.|via=Google Books}} memory card. It has 2 rows of pin holes which are shifted against each other by half the pin spacing. The card is 3.3mm thick. Released in 1986.https://www.cqpub.co.jp/hanbai/books/49/49971/49971_1syo.pdf {{Bare URL PDF|date=August 2024}}
• Version 2.0 is only mechanically compatible with the Version 1.0 card. Version 1.0 cards fail in devices designed for Version 2.0. Released in 1987.
• Version 3 is a 68-pin memory card. It is also used in the Neo Geo.{{citation needed|date=February 2024}} Released in 1989 and has variants with 20, 34, 40 and 68 pins.
• Version 4.0 corresponds with 68-pin PCMCIA 1.0 (1990).{{Cite book|url=https://books.google.com/books?id=cNnvbyOKioEC&dq=PCMCIA+september+1989&pg=PA14|title=PCMCIA System Architecture: 16-bit PC Cards|first1=Don|last1=Anderson|first2=MindShare|last2=Inc|date=January 25, 1995|publisher=Addison-Wesley Professional|isbn=978-0-201-40991-8 |via=Google Books}}
• Version 4.1 unified the PCMCIA and JEIDA standards as PCMCIA 2.0. v4.1 is the 16-bit PC Card standard that defines Type I, II, III, and IV card sizes.
• Version 4.2 is the PCMCIA 2.1 standard, and introduced CardBus' 32-bit interface in an almost physically identical casing.

• Japan Electronic Industries Development Association
• Japan Electronics and Information Technology Industries Association
• Personal Computer Memory Card International Association
• Compact Flash

{{Reflist}}

• [https://www.thinkwiki.org/wiki/IC_DRAM_Card IC DRAM Card - Thinkwiki.org]

{{Memory Cards}}

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Category:Computer buses

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Category:PCMCIA

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