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Apple at 1200 BPS [message #70709] Thu, 23 May 2013 23:18 Go to next message
wolenty is currently offline  wolenty
Messages: 7
Registered: May 2013
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Message-ID: <589@inuxd.UUCP>
Date: Wed, 25-Jul-84 14:25:35 EDT
Article-I.D.: inuxd.589
Posted: Wed Jul 25 14:25:35 1984
Date-Received: Fri, 27-Jul-84 04:56:53 EDT
Organization: AT&T Consumer Products Div., Indianapolis
Lines: 13



I have a problem using the Apple as a dumb terminal at 1200 bits per
second.  I am using a short assembly language program on an Apple
IIe that monitors the serial port and Apple keyboard port and
writes to the screen using the firmware routine at $FDED.  The
problem is during CR/LF sequences several characters are lost.
I want to know if there is a different subroutine I should be using
or do I have to write my own display driver. Suggestions or comments
are welcome.

				Ron Wolenty (AT&T Consumer Products)
				Indianapolis, IN
Re: Apple at 1200 BPS [message #70717 is a reply to message #70709] Thu, 23 May 2013 23:18 Go to previous message
gwyn is currently offline  gwyn
Messages: 27
Registered: May 2013
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Message-ID: <449@sri-arpa.UUCP>
Date: Thu, 26-Jul-84 12:33:30 EDT
Article-I.D.: sri-arpa.449
Posted: Thu Jul 26 12:33:30 1984
Date-Received: Sat, 28-Jul-84 10:28:17 EDT
Lines: 7

From:      Doug Gwyn (VLD/VMB) 

The code that scrolls the display is taking too long
to keep up with 1200 baud.  This is a standard problem,
especially with 80-column cards.  The solution is to
write your own display code (use modem interrupts or
poll the modem port frequently).
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