Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site unc.UUCP Path: utzoo!watmath!clyde!burl!ulysses!allegra!bellcore!decvax!mcnc!unc!colbert From: colbert@unc.UUCP (Darylene Colbert) Newsgroups: net.micro.pc Subject: 3270 PC Communications Problem Message-ID: <57@unc.UUCP> Date: Tue, 15-Jan-85 15:16:54 EST Article-I.D.: unc.57 Posted: Tue Jan 15 15:16:54 1985 Date-Received: Fri, 18-Jan-85 01:51:41 EST Organization: CS Dept., U. of N. Carolina at Chapel Hill Lines: 15 <> For some reason the 3270 PC loses incoming data from the RS232 port when a BIOS call is made to change the displa to medium resolution graphics mode (I have the APA card). I have tested my interrupt-driven program on 3 different 3270 PC's and all share the problem. The same program works fine on a PC/XT. It appears that approximately 40ms worth of data is lost when the call is made. Does anyone have a clue to what is going on and what I can do to get around it? Thanks. Edmund Burnette :wq