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AST RESEARCH, INC. TECHNICAL BULLETIN #0718 10-09-91
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AST's SVGA MONITOR AND OS/2 1.21
SYMPTOM: Various screen problems may occur with AST systems using the
800x600 resolution mode under AST OS/2 version 1.21 with the
AST SVGA monitor. Some of the problems experienced are as
follows:
Shaking of the screen.
Slight shift of the screen.
A line down the center of the screen.
A loss of the screen when switching between video modes.
PROBLEM: The current BVHVGA.DLL driver under AST OS/2 version 1.21
instructs the video chip on the AST system board to generate
an output of 34.4 kHz instead of the VESA (Video Electronics
Standard Association) specified horizontal frequency of 35.2
kHz for SVGA monitors. The AST SVGA monitors follow the VESA
specifications for the horizontal frequency.
SOLUTION: A driver called BVHVGA.DLL with the byte size of 37994 is
available on the AST BBS under the file name of OS2-VGA.ZIP
which is located in the file area called SYSTEMS. This driver
sets the video chip output to match the VESA specified SVGA
horizontal frequency of 35.2 kHz for the AST SVGA monitor.
This new driver will be incorporated in AST OS/2 version 1.3.