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Article #2988

Simple Serial Port TSR needed

#2988
From: Tim Kuehn
Date: Tue, 13 Mar 1990 16:30
28 lines
2071 bytes
I have a CI-3500 printer with a serial interface that normally hooks up to 
a VAX that I'd like to hook up to a PC instead. Unfortunatly I don't have
the pinouts on the serial port (if someone has them - it's the model 10 
interface - I'd be grateful for a copy), but I do know that it supports
the xon-xoff protocol. My problem is that the version of DOS I have 
doesn't recognize the SW handshaking, only HW handshaking. If I tie the 
appropriate lines together on the PC's serial port, it transmits full
speed without stopping, and as a result there are places in the printout
that are missing large quantities of information. IF the lines aren't 
tied together, then I get a "Write fault error writing to device COM1:"

So what I need is a TSR I can run which will grab the serial port interrupt
vector, watch the port, and when it recieves a XON signal, return a 
"Busy" condition to BIOS, and when it get an XOFF signal, return a
"Ready"  condition to BIOS. Is there someone out there who's done
something similar and would be willing to send me a copy of their 
code, or enough of a code fragment that I can patch the rest together
myself?

Thanks for any and all help!

+-----------------------------------------------------------------------------+
|Timothy D. Kuehn	       			       timk@xenitec.on.ca     |
|TDK Consulting Services			       !watmath!xenitec!timk  |
|871 Victoria St. North, Suite 217A					      |
|Kitchener, Ontario, Canada N2B 3S4 		       (519)-741-3623 	      |
|DOS/Xenix - SW/HW. uC, uP, DBMS. 		       Quality SW Guaranteed  |
+-----------------------------------------------------------------------------+
Technical Details
Message-ID: <1990Mar13.163036.9932@xenitec.on.ca>
Path: arc1-ca.pugleaf.net!utzoo!utgpu!watserv1!watmath!maytag!xenitec!timk

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!watserv1!watmath!maytag!xenitec!timk
From: timk@xenitec.on.ca (Tim Kuehn)
Newsgroups: misc.wanted,comp.sys.ibm.pc.programmer
Subject: Simple Serial Port TSR needed
Message-ID: <1990Mar13.163036.9932@xenitec.on.ca>
Date: 13 Mar 90 16:30:36 GMT
Reply-To: timk@xenitec.UUCP (Tim Kuehn)
Distribution: na
Organization: TDK Consulting Services, Kitchener, ON, Canada
Lines: 28