PCMCIA

PCMCIA stands for Personal Computer Memory Card International Association. This industry association was founded in 1989 to develop a standard for credit card sized removable personal computer adapters known as PC Cards.

PCMCIA Specifications

The association has released the following PCMCIA specifications:

PCMCIA 1.0

Release in 1990, the first PCMCIA specification established the basic PC Card standards, namely the 68-pin Interface Type I and [[#Type II|Type II] and the Card Information Structure (CIS) Metaformat. It supported memory cards only.

PCMCIA 2.0

The 2.0 specification enhanced the memory card specifications and introduced support for I/O cards. It also added definitions of Card Environmental Requirements and standard test methods.

PCMCIA 2.01

Version 2.01 focussed on mass storage and digital image support by intrucing the Type III form factor along with the PC Card ATA and other specifications. It also introduced the Card Services API.

PCMCIA 2.1

PCMCIA 2.1 enhanced the Card and Socket Services specifications as well as the Card Information Structure.

PCMCIA 5.0

Version 5.0, released in 1995, brought major enhancements to the PC Card definitions, most importantly in introduced the 32-bit CardBus Bus Mastering Interface, added support for Low Voltage-only Operation (3.3V), DMA, APM and multi-function cards.

PCMCIA 5.01 to PCMCIA 5.04

The most important improvements of the following minor releases were the introduced support for the Flash Translation Layer (FTL) as well as Custom Interfaces with the Zoomed Video (ZV Port) Custom Interface being the first one.

PCMCIA 6.0 to PCMCIA 7.2

Versions 6.0 to 7.2 of the specification added support for ISDN, Security and Instrumentation Cards as well as a couple of features and enhancements.

PCMCIA 8.0

In April 2001 version 8.0 introduced the CardBay specification that combines the USB and IEEE 1394 standards into the PC Card format.

PC Card Types

The PCMCIA specifications define three physical sizes of PC Cards, known as Type I to III. Taken aside cards with extended form factors (used to enable devices that need to have parts outside the slot like wireless antennas, CD-ROM drives etc.) all three types measure the same width and length and they all use the same 68-pin connector. They only differ from each other in their thickness. Of course a thinner card can be used in a thicker slot, but not the other way around.

Type I

• 3.3mm thick
• typically used for memory devices such as RAM, Flash, OTP, and SRAM cards

Type II

• 5.0mm thick
• typically used for I/O devices such as data/fax modems, LANs, and mass storage devices

Type III

• 10.5mm thick
• typically used for thicker devices, such as rotating mass storage devices