The JEIDA memory card standard is a popular memory card standard at the beginning of memory cards appearing on portable computers. JEIDA 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, through

SEMATECH SEMATECH (from Semiconductor Manufacturing Technology) was a not-for-profit consortium that performed research and development to advance chip manufacturing. SEMATECH involved collaboration between various sectors of the R&D community, includin ...

, and thus

PCMCIA The Personal Computer Memory Card International Association (PCMCIA) was an industry consortium of computer hardware manufacturers from 1989 to 2009. Starting with the PCMCIA card in 1990 (the name later simplified to ''PC Card''), it created v ...

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.

Usage

The JEIDA memory card was used in earlier

ThinkPad ThinkPad is a line of business-oriented laptop and Tablet computer, tablet computers produced since 1992. It was originally designed, created and manufactured by the American IBM, International Business Machines (IBM) Corporation. IBM Acquisit ...

models, where

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branded them as IC DRAM Cards. The interface has also been used in 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. Released in 1986.https://www.cqpub.co.jp/hanbai/books/49/49971/49971_1syo.pdf *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 The , stylized as NEO•GEO, is a video game platform released in 1990 by Japanese game company SNK Corporation. It was initially released in two ROM cartridge-based formats: an arcade system board (Multi Video System; MVS) and a home video gam ...

. Released in 1989 and has variants with 20, 34, 40 and 68 pins. *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 PC Card is a technical standard specifying an expansion card interface for laptops and personal digital assistants, PDAs. The PCMCIA originally introduced the 16-bit Industry Standard Architecture, ISA-based PCMCIA Card in 1990, but renamed it to ...

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.

References

External links

IC DRAM Card - Thinkwiki.org
Computer buses Motherboard PCMCIA {{Compu-hardware-stub

History

Usage

Versions

See also

References

External links