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From: dmt@pegasus.ATT.COM (Dave Tutelman)
Newsgroups: comp.binaries.ibm.pc.d
Subject: FIND211 display problem
Keywords: PC6300 indigenous display
Message-ID: <4988@pegasus.ATT.COM>
Date: 23 Aug 90 12:05:13 GMT
Organization: AT&T Bell Labs - Lincroft, NJ
Lines: 36

I have encountered a problem with the FIND 2.11 utility posted recently
in comp.binaries.ibm.pc.  Specifically:

When run on a machine with an AT&T PC6300-style display (640x400, but
CGA-compatible mode), nothing is output to the display after the
first screen is drawn from FIND.  Details:
   -	No subsequent screens are drawn, or even attempted; the display
	on the screen is unchanged.
   -	The machine is not locked up.  If I key in (blind, because none
	of this echoes back) a "cls" or "mode co80" command, I get my
	display back.
   -	This occurs on the PC6300, and on the 6300+.  The latter was
	equipped with a DEB board (AT&T Display Enhancement Board;
	extra video planes, for more colors in bitmapped graphics).
	The former was the basic indigenous display.
   -	It is NOT a problem on a PC6300 equipped with a vanilla CGA
	card (indigenous display disabled), nor on an AT&T 6386/SX WGS
	with built-in VGA.
   -	The problem is absolutely repeatable for any of the hardware
	configurations; nothing intermittent about it.  On a machine
	where it occurs, it occurs all the time.  It occurs for short
	outputs (less than a screen) and for long outputs (multiple
	screens); in the latter case, the first screen remains displayed
	until I reset the video mode.

I'd guess some of the screen writing is being done with direct writes
to the video adapter rather than DOS or BIOS calls.  But it's just
a guess.

Dave
+---------------------------------------------------------------+
|    Dave Tutelman						|
|    Physical - AT&T Bell Labs  -  Lincroft, NJ			|
|    Logical -  ...att!pegasus!dmt == dmt@pegasus.att.com	|
|    Audible -  (201) 576 2194					|
+---------------------------------------------------------------+