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© Sealevel Systems, Inc.
3612 Manual | SL9115 9/2021
Introduction
Overview
In the last few years, the portable and notebook market has grown by leaps and bounds. Most early laptops
and notebooks handled I/O expansion through proprietary expansion slots. These slots provided limited
expansion for specific peripherals such as modems and FAX peripherals. Mass storage peripherals were
factory installed and could not be easily changed. Interconnectivity through local area networks offered
limited performance through slow parallel port network interfaces.
During this time period two standards organizations, JEIDA, and PCMCIA, were working on the
standardization of memory IC cards. These cards were designed as strictly non-volatile silicon storage.
JEIDA was the first to propose the 68-pin connector standard for memory cards. In 1989, PCMCIA adopted
the JEIDA 68 pin standard and worked with JEIDA on further developments.
As the notebook market grew, the need for a standard I/O bus was seen. The PCMCIA groups saw an
opportunity to meet this need with an expanded version of the 68-pin interface. Further development
occurred and within one year, release 2.0 of the standard was completed. Release 2.0 was a major update
to Release 1.0 and included full hardware support for I/O devices. Release 2.0 coincided with JEIDA’s 4.1
release and is identical.
The
PC-ACB.MP
adapter provides your portable PC with a single channel multi-protocol serial interface
utilizing the Zilog Z85233 (ESCC™), which is suitable for the most popular communication protocols
including HDLC/SDLC, X.25, Bi-Sync, Mono-Sync, and asynchronous.
The
PC-ACB.MP
utilizes the Sipex-505 multi-protocol electrical interface chip that allows the
PC-ACB.MP
to be compliant with EIA/TIA-530/530A, EIA/TIA-232E, EIA/TIA-485, and ITU V.35.
