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