Adaptec APA-358 Installation Guide download pdf (Page 3)

APA-358 Installation Guide

Part Number: 510604-00, Rev. A

Print Spec Number: 492717-00

Current Date: 5/19/94 ECN Date: 5/31/94

■ APA-358 MiniSCSI EPP Installation Guide

■ Software User Guide

■ Product Registration card

■ Microsoft

MSCDEX Registration card

If anything is missing, please contact your dealer.

What is EPP?

This section gives you a brief overview of the

Enhanced Parallel Port (EPP) design and how the

adapter functions to incorporate the increased per-

formance of EPP.

EPP is a major breakthrough in enhancing parallel

port performance. Current parallel ports achieve

data transfer rates of between 50 and 260 KBytes/

sec, but the EPP reaches up to 1 MBytes/sec.

How is this achieved? Current device drivers for

parallel port peripherals require several instructions

to be executed for each byte of data transferred. With

EPP, each byte requires a single I/O instruction, sub-

stantially reducing overhead per byte. These fea-

tures, plus improved hardware design, significantly

improve the performance of parallel-connected

peripherals.

There is no need to specify whether an EPP device is

being connected—faster EPP transmission rates are

automatic. When not running in EPP mode, the port

operates at standard parallel rates, providing com-

patibility between EPP and non-EPP parallel ports

and peripherals.

With the new MiniSCSI EPP, you can take advantage

of this new EPP technology and achieve the best per-

formance for your peripherals. The adapter pro-

vides easy connection of peripherals and is roughly

as fast as a conventional 8-bit ISA-bus SCSI adapter.

The MiniSCSI EPP is also backward compatible

with non-EPP unidirectional and bidirectional paral-

lel ports. Simply connect the adapter to your parallel

port, and it detects which port you have.

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Adaptec APA-358 Installation Guide Page 3