Newsgroups: comp.windows.ms.programmer
Path: utzoo!news-server.csri.toronto.edu!utgpu!watserv1!sunee!gpsteffl
From: gpsteffl@sunee.waterloo.edu (Glenn Patrick Steffler)
Subject: Re: com port problem and MSW
Message-ID: <1991Mar18.005505.10222@sunee.waterloo.edu>
Organization: Gold Disk Inc.
References: <4460@se-sd.SanDiego.NCR.COM>
Date: Mon, 18 Mar 1991 00:55:05 GMT
Lines: 49

In article <4460@se-sd.SanDiego.NCR.COM> curtis@se-sd.SanDiego.NCR.COM (Curtis Johnson) writes:
>
>
>I'm debugging a problem that occurs in an RS232 communications
>manager that runs under MSW3.0.  This product provides a user
>interface to a mini-computer via MS Windows.
>
>The symptom that we're concerned with is that serial data
>apparently gets lost somewhere between the serial port and
>MS Windows.
>
>and 512 for both) with the same results.  The symptoms occur at
>19200, 9600, 4800, 2400 and 1200 baud with a 7 bit data size,
>one stop bit and even parity.  The symptoms occur when the PC
>is connected directly to the serial port of the other computer
>and when connected through a modem.
If you are in standard mode use
[kernel]
int28filter=0
in system.ini to stop int 28 (TSR multiprocess interrupt) from
happening.  This may help improve comm throughput.

Why not try an XON/XOFF protocol?  This is handled at the driver
level, and is thus impervious (I would hope) to system slowdowns
and such.

ASSIDE:
All ps/2 machines have their comm port on one large logic component
on the CPU card.  The comm driver also must have special code to map
to some of the BIOS locations on ps/2's that hold certain values
relevant to comm operations.

However, because the comm driver already accounts for this, I an
still somewhat cloudy on the relationship you have implied between
ps/2's and the comm problems.  Please substantiate your claim with
more info.

>
>Any ideas?  Sure could use some help on this one.  Thanks.
>
>--
>curtis@se-sd.sandiego.ncr.com
>(619) 693-5685

-- 
Co-Op Scum                            "Bo doesn't know software" - George Brett

"The galaxial hearth steams the sea as the sky blood red embrasses darkness"
-John Constantine (HellBlazer)                          Glenn Steffler