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AST RESEARCH, INC. TECHNICAL BULLETIN #0742 01-24-92
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MICROSOFT WINDOWS 3.0 AND ENHANCED VGA MODES
PROBLEM: When running the application WordPerfect 5.1 in 132x43 column
text mode under Windows 3.0 (Real, Standard, or Enhanced
modes) and switching between tasks using the <ALT> + <TAB> key
sequence, or using the Task List, when the user switches away
from and then back to the WordPerfect session the screen is
blank with only a flashing cursor on the screen.
CAUSE: Microsoft has advised AST that Windows does not support DOS
applications (WordPerfect and others) running in extended
graphics modes such as 132x43 column text mode or 640x400x256
graphics mode. Windows will only support standard VGA text
and graphics modes for these applications.
SOLUTION: Run DOS applications in standard VGA modes only.