Path: utzoo!attcan!uunet!aplcen!uakari.primate.wisc.edu!zaphod.mps.ohio-state.edu!wuarchive!decwrl!
From: lamb@soadc.enet.dec.com (brad lamb 13-feb-1990 0819)
Newsgroups: comp.sys.apple
Subject: Problem using serial port firmware
Message-ID: <9002131320.AA06440@decwrl.dec.com>
Date: 13 Feb 90 13:21:01 GMT
Organization: Digital Equipment Corporation
Lines: 17

I need a little help with this problem.  I am writting an application in which
I need to send and receive from the serial port during a heartbeat interrupt.
The interrupt part is working fine (I think) but I am having a problem with the
serial port.  Since this is in an interrupt, I can't count on using any GSOS
calls.  That brings me to the serial port firmware, as described in chapter 5
of Apple IIgs Frimware Reference.  Unfortunately, no examples were given on how
to use the Pascal protocol and I am not enough of an assembler to figure it out.

First, could someone provide some samples of code using the Pascal firmware 
protocol, or a poiner to some samples?

Second, is there an alternative way (better) way of working with the serial 
port while in an interrupt?


Brad Lamb
Digital Equipment Corporation