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From: johng@iscuva.ISCS.COM (John Gardner)
Newsgroups: comp.sys.atari.st
Subject: Re: How can you send a BREAK?
Message-ID: <553@iscuva.ISCS.COM>
Date: Tue, 23-Jun-87 23:20:17 EDT
Article-I.D.: iscuva.553
Posted: Tue Jun 23 23:20:17 1987
Date-Received: Thu, 25-Jun-87 05:35:29 EDT
References: <8706230308.AA26681@ucbvax.Berkeley.EDU>
Reply-To: johng@iscuva.UUCP (John Gardner)
Distribution: world
Organization: ISC Systems Corporation, Spokane, WA
Lines: 20

In article <8706230308.AA26681@ucbvax.Berkeley.EDU> SYSTEM@UVPHYS.BITNET (NAME NIK ZAPANTIS) writes:
>  I would like to be able to send a BREAK to my RS-232 port from my program,
>just like UNITERM does with the ALT L or ALT B key.
>
>Thank you in advance,
>
>Nik Zapantis


To send the break signal, you need to program the 68901's tsr register. If
you put in a hex 0x89 the RS232 port will now send the break signal. Write 
tsr with a hex 0x81 to turn it off.

The Atari developer's kit includes a function called Rsconf and basically
if you do something like Rsconf(-1, -1, -1, -1, 0x89, -1); you turn on
break. The -1's tell this function not to change the parameter at that 
location. The parameters appear like this,
  Rsconf(speed, flowctl, ucr, rsr, tsr, scr);

Later, JAG