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The JEIDA memory card standard is a popular memory card standard at the beginning of memory cards appearing on portable computers.
IC DRAM Card - Thinkwiki.org
Computer buses Motherboard {{Compu-hardware-stub
The JEIDA memory card standard is a popular memory card standard at the beginning of memory cards appearing on portable computers. JEIDA
The (Formerly ) was an industry research, development, and standards body for electronics in Japan. It was merged with EIAJ to form JEITA on November 1, 2000.
JEIDA was similar to SEMATECH of the US, ECMA of Europe.
JEIDA developed a number o ...
cards could be used to expand system memory or as a solid-state storage drive.
History
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, throughSEMATECH
SEMATECH (from Semiconductor Manufacturing Technology) is a not-for-profit consortium that performs research and development to advance chip manufacturing. SEMATECH has broad engagement with various sectors of the R&D community, including chipma ...
, and thus PCMCIA
The Personal Computer Memory Card International Association (PCMCIA) was a group of computer hardware manufacturers, operating under that name from 1989 to 2009. Starting with the PCMCIA card in 1990 (the name later simplified to ''PC Card''), i ...
was born. PCMCIA and JEIDA worked to solve this rift between the two competing standards, and merged into JEIDA 4.1 or PCMCIA 2.0 in 1991.
Usage
The JEIDA memory card was used in earlierThinkPad
ThinkPad is a line of business-oriented laptop computers and tablet computers, tablets designed, developed and marketed by Lenovo, and formerly by IBM until 2005, when IBM's Personal computer, PC business was acquired by Lenovo. ThinkPads have ...
models, where IBM branded them as IC DRAM Cards.
The interface has also been used for SRAM cards.
Versions
*Version 1.0 is an 88-pin 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. *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. *Version 3 is a 68-pin memory card. It is also used in theNeo Geo
Neo Geo is a family of video game hardware developed by SNK. On the market from 1990 to 2004, the brand originated with the release of an arcade system, the Neo Geo MVS and its home console counterpart, the Neo Geo AES.
The Neo Geo MVS was su ...
.
*Version 4.0 corresponds with 68-pin PCMCIA 1.0 (1990).
*Version 4.1 unified the PCMCIA and JEIDA standards as PCMCIA 2.0. v4.1 is the 16-bit PC Card
In computing, PC Card is a configuration for computer parallel communication peripheral interface, designed for laptop computers. Originally introduced as PCMCIA, the PC Card standard as well as its successors like CardBus were defined and devel ...
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.
See also
*Japan Electronic Industries Development Association
The (Formerly ) was an industry research, development, and standards body for electronics in Japan. It was merged with EIAJ to form JEITA on November 1, 2000.
JEIDA was similar to SEMATECH of the US, ECMA of Europe.
JEIDA developed a number o ...
* Japan Electronics and Information Technology Industries Association
The is a Japanese trade organization for the electronics and IT industries. It was formed in 2000 from two earlier organizations, the Electronic Industries Association of Japan and the Japan Electronic Industries Development Association.
Histor ...
* Personal Computer Memory Card International Association
The Personal Computer Memory Card International Association (PCMCIA) was a group of computer hardware manufacturers, operating under that name from 1989 to 2009. Starting with the PCMCIA card in 1990 (the name later simplified to ''PC Card''), i ...
* Compact Flash
CompactFlash (CF) is a flash memory mass storage device used mainly in portable electronic devices. The format was specified and the devices were first manufactured by SanDisk in 1994.
CompactFlash became one of the most successful of the ea ...
References
External links
IC DRAM Card - Thinkwiki.org
Computer buses Motherboard {{Compu-hardware-stub