Caple C871i Manual de usuario descargar pdf (Pagina 517)

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101

Apple II Computer Info

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Path: news.uiowa.edu!news.physics.uiowa.edu!math.ohio-

state.edu!howland.erols.net!newsfeed.internetmci.com!newshub.csu.net!cello.gina.ca

lstate.edu!cello.gina.calstate.edu!not-for-mail

From: [email protected] (Steve Jensen)

Newsgroups: comp.sys.apple2

Subject: Re: Please Reprint

Date: 12 Sep 1996 19:06:30 -0700

Organization: GINA and CORE+ Services of The California State University

Lines: 89

Message-ID: <[email protected]>

References: <[email protected]>

NNTP-Posting-Host: cello.gina.calstate.edu

[email protected] (Robert Rait) writes:

> Someone posted a great artical about Modems for the //e,

> with information that showed that a //e with a super serial

> card could handle upto 14400. Could you please repost that.

> Thanks

Here 'tiz:

Lightning Systems Product Information Sheet

Lightning Systems offers two (2) products for the Apple // line of computers.

6551-ACIA

---------

This is a replacement chip for the 6551 ACIA (Asynchronous Communications

Interface Adapter) that is standard on most Serial Interface cards for the

Apple //.

Why do you need a replacement chip? Simple, the 6551 chip that is on most

Serial Interface cards has a design flaw in it that causes it to lose a

character every time the CTS line is switched.

In most cases, this is not a problem. However, with modem speeds

continuing to

rise, people have started using Hardware Handshaking cables to connect their

computers to their modems to achieve even higher speeds. This is where the

problem lies.

In typical Hardware Handshaking installations, the computer is sending and

receiving data faster than the modem can receive and transmit data. This

means

that the computer and the modem need a way to communicate between

themselves to

tell each other when it's ok to send or receive data. When the modem's buffer

fills up, the modem switches the CTS (Clear To Send) line to notify the

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 517 of 572

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Caple C871i Manual de usuario Pagina 517

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Caple C871i Manual de usuario Pagina 517

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