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AST RESEARCH, INC. TECHNICAL BULLETIN #0762 07-01-92
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AST 5251/11 ENHANCED AND PC GUARDIAN "VIRUS PREVENTION PLUS"
PROBLEM: When using the application "Virus Prevention Plus" from PC
Guardian Security Products, with AST 5251/11 Enhanced
emulation software, any attempt to unload emulation from
memory will result in a system lock-up.
CAUSE: With "Virus Prevention Plus" resident in memory, AST 5251/11
Enhanced emulation will not unload correctly because its
software interrupt vectors have been changed by the PC
Guardian software.
AFFECTED
SYSTEMS: AST 5251/11 Enhanced
SOLUTION: AST EPD Marketing has determined that this problem will not be
fixed. The AST 5251/11 Enhanced emulation product is working
as designed. To force emulation to unload after its software
interrupt vectors have been changed may corrupt the interrupt
vector chain and cause failures with other DOS applications.
As a work around, AST recommends either not loading "Virus
Prevention Plus" when using 5251/11 Enhanced emulation or
rebooting the system to unload emulation.