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From: dillon@PAVEPAWS.BERKELEY.EDU (Matt Dillon)
Newsgroups: net.micro.amiga
Subject: Serial Port speeds
Message-ID: <8605311901.AA02278@pavepaws>
Date: Sat, 31-May-86 15:01:00 EDT
Article-I.D.: pavepaws.8605311901.AA02278
Posted: Sat May 31 15:01:00 1986
Date-Received: Mon, 2-Jun-86 15:53:34 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: University of California at Berkeley
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	I wrote a little test program for the serial port... it writes
128 bytes (0-127), and reads them back.... I wanted to see how fast the
serial port would go without loosing characters (had RAD_BOOGIE set as 
well).  No protocols, NO 7-wire.

	Well, I set the thing to 292000 baud, and it worked! (8-bit,
no parity, 1 stop) = 10 bit transmission = 29200 bytes/sec, or one byte
every 34.2 uS.

	Did I make a mistake, or can the serial port *really* receive that
fast without loosing characters.  The 128-byte packets were mere blips on
the RD and SD L.E.D.'s for my modem (in local echo mode).
Even with a loaded system there didn't seem to be any problem.

	Whether I'm right or wrong, I would like to complement the 
designers of the Amiga for the excellent serial port!

	Here's a technical question (please don't answer unless you really
know the answer... no answer is better than the wrong answer):  What is
the overhead for interrupt service routines (say, the first service routine
in a given chain)?

					-Matt