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From: ekalenda@cup.portal.com (Edward John Kalenda)
Newsgroups: comp.os.msdos.programmer
Subject: Re: ISR writes to disk. Tips needed.
Message-ID: <42399@cup.portal.com>
Date: 16 May 91 20:10:45 GMT
References: <13073@monu1.cc.monash.oz> <42177@ucbvax.BERKELEY.EDU>
Organization: The Portal System (TM)
Lines: 16

(Lots of stuff about writing to disk from an ISR while DOS is doing other
stuff).

The Microsoft Encyclopedia has a nice example program called SNAP which
sits in the background and does aa print-screen type of operation to a
disk file. It can do it at any time, regardless of what is happening in
the foreground. By any time I mean that it will remember the request and
do it as soon as things are in a safe condition. Usually less under 1/20
of a second.

I wrote a TSR program for a client which monitors the serial port in this
way so the activity could be analyzed later. The trick is to have multiple
buffers to fill and write so you never lose any data.

Ed
ekalenda@cup.portal.com