dmt@pegasus.ATT.COM (Dave Tutelman) (08/23/90)
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 | +---------------------------------------------------------------+