Caple C871i Uživatelský manuál stáhnout pdf (Strana 486)

Apple II Computer Info

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Path: news.weeg.uiowa.edu!news.uiowa.edu!hobbes.physics.uiowa.edu!zaphod.mps.ohio-

state.edu!swrinde!news.dell.com!math.utexas.edu!ut-emx!ccwf.cc.utexas.edu

From: [email protected] (Michael Foegelle)

Newsgroups: comp.sys.apple2

Subject: Re: SSC - //e - High Speed Modem - ProTERM question

Message-ID: <[email protected]>

Date: 17 Sep 92 17:10:48 GMT

References: <[email protected]>

Sender: [email protected]

Organization: The University of Texas at Austin, Austin TX

Lines: 49

In article <[email protected]> [email protected] (Ron) writes:

>I've been having a little bit of trouble with my set up, and am wondering

>if anyone else is having the same problems. I've been in contact with the

>author of ProTERM v3.0 about this, and would like to comfirm that this

>isn't just my problem before persuing it further.

>I'm looking for people that are running a high speed modem ( >9600 ) and a

>Super Serial Card with ProTERM v3.0.

>What I'd like to know is if you are having trouble with Zmodem sends to a

>remote system at a transfer rate faster than 9600 bps. (Hardware flow

>control is needed for this operation)

>The problem I'm seeing is that I get errors in the transfer when the CTS

>light flashes.

>Greg Schaefer explains the problem as a 6551 problem. He says that when

>the CTS line goes low, the 6551 chip stops transmitting data, even if it's

>in the middle of a character!

There are two different types of the 6551 ACIA, a 6551 and a 6551A. The

difference is in the way they handle the CTS. The 6551 stops sending

immediately, even if in the middle of a character, while the 6551A sends the

whole data byte and then stops. (I believe the 6551 resends the aborted

character after CTS resumes.) A 6551A (or 65C51A) only runs about $6 or so

from most electronics dealers, so it's no big deal to go buy one and pull the

offending 6551 and replace it with a 6551A. I also discovered that some 6551's

tend to for some reason drop CTS internally when you drop RTS. That means if

your program is telling the modem not to send anything because it's too busy to

receive, then the program can't send anything OUT to the modem either! I'm

using a 65c51A from GE/Harris/RCA (all the same semiconductor company now)

which solves all these problems for me.

>Anyone else having trouble?

>--

>Ron | Lightning Systems, INC. | Apple // Forever!

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 486 of 572

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