Article View: comp.os.msdos.programmer
Article #2106Re: Accessing VGA memory inside INT 0x33 FUNC 0x0c
From: Walter Bright
Date: Fri, 07 Sep 1990 18:45
Date: Fri, 07 Sep 1990 18:45
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In article <15188@shlump.nac.dec.com> heintze@grane.enet.dec.com (Siegfried Heintze) writes: < Hurray, hurray - I have, after many late nights and much tribulation, < found the problem: ZORTECH's sleep function (V2.1 or later, V2.0x seems < fine) causes hangs or calls to exit(0) when INT 0x33 FUNC 2 or INT 0x10 FUNC < 9 is called from the routine whose address is passed INT 0x33 FUNC 0x0c. Zortech's sleep function is implemented as a simple loop that calls the DOS get time of day function in a tight loop until the specified time has elapsed. Unfortunately, DOS and the BIOS are not reentrant, so calling DOS or the BIOS while in sleep could cause a crash.
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!uunet!pilchuck!dataio!bright From: bright@Data-IO.COM (Walter Bright) Newsgroups: comp.os.msdos.programmer Subject: Re: Accessing VGA memory inside INT 0x33 FUNC 0x0c Keywords: VGA, MOUSE, INTERRUPTS Message-ID: <2695@dataio.Data-IO.COM> Date: 7 Sep 90 18:45:49 GMT References: <15188@shlump.nac.dec.com> Organization: Data I/O Corporation; Redmond, WA Lines: 10