Multitech ISI552PC Manual do Proprietário descarregar pdf (Página 4)

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1 . 1 Introduction

The introduction of high speed, data compression

modems, such as Multi-Tech's MultiModem

II TM

Series, has shown that many PC serial ports are

unable to keep up, essentially becoming a bottleneck

for the entire system. The ISI552PC card is a dual

port serial expansion card and provides processing

power to reliably transmit data up to 115.2K bps per

port. Each port can be independently configured for

asynchronous full duplex communications. Using

an ISI enables your system's processor to perform

more efficiently. This is because the ISI handles all

of the byte-by-byte interrupts generated by the

asynchronous terminals and stores the data in

buffers. The ISI then generates one interrupt for an

entire block of information and transfers the block to

the system's microprocessor.

This manual provides the hardware installation

procedures for the ISI552PC card. The operation of

the card provides the basis for its name ISI (Intelligent

Serial Interface), 552 indicating the processing power

of a 16550A UART and dual port support, and PC

indicating that it is an ISA bus card (8 bit), which is

able to operate in any 286, 386, or 486 ISA or EISA

compatible bus personal computer. The ISI552PC

serial ports can be accessed by any software written

to the 16550A specification.

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