Hello PHIL!

Thursday, January 16 1997, PHIL PATTENGALE wrote to JEFFREY HABETS:

 ->> I would like to monitor all incoming and/or outgoing data on the
 ->> serial port. Now, that wouldn't be to difficult if my program was

 PP> Well, if you don't wanna re-invent the wheel,

I want to.. :)

 PP> I'd suggest you look at Ray Gwinn's PMLM (Poor Man's Line Monitor) which
 PP> is included with his SIO package.  This displays all the chars going in
 PP> and out of a port, as well as tracking line signals being raised &
 PP> lowered.  Handy program.

I know the PMLM does (among other things) what I want, and I think it uses
some undocumented hooks in SIO..

The problem is that I want to put some features like measuring cps-rate and
catching the dialed telephonenumber into a program I'm working on. Thus
third party software is out of the question.

Tracking the line signals is easy.. The big problem is 'peeking' at
incoming and outgoing data.
I could do things from an IOPL segment and read directly from the port, but
than I _must_ pol the port at least 3500 times/second if I want to be able
to count the cps for a 28k8 connection. I'll then probably need to use
TIMER0.SYS for the timing-issue. Quite a hassle.

I just wonder how DosRead() manages to block on a read from a port. Seems
to me it must be able to receive interrupts somehow.

 PP> Course, if you wanna write your own, I can't help there.

To bad.. But thanks anyway.

Greetz from Maastricht/The Netherlands,
Jeffrey  >

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