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Simtel MSDOS 1992 June
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SIMTEL_0692.cdr
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msdos
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desqview
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xdvee11.arc
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REMMSYS.BUG
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1989-01-16
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REMM.SYS 4.X AND DESQVIEW 2.XX
Users of DESQview 2.01 (or above) may experience system lock-up when using a
version of REMM.SYS of 4.10 (or above). The lock-up occurs when running an
interrupt-intensive application such as a serial communications program.
The reason that this particular combination causes this symptom lies in the
fact that the LIM 4.0 functions are being executed in software, requiring a
large amount of processing time. This amount of overhead becomes critical
when processing time must also be devoted to servicing the stream of
interrupts generated by a communications program. Any application that must
devote a great deal of time to both expanded memory operations and serial
communications will eventually be unable to keep pace and cease to function.
It is recommended that those users who operate in this environment and
experiencing problems, replace the 4.xx version of the REMM.SYS driver with a
3.xx version. For AST Systems products, version 3.50 of REMM.SYS is
recommended. For AST board-level expanded memory products version 3.10 of
REMM.SYS will operate in this environment.
Those users with expanded memory hardware which fully supports the LIM 4.0
Specification, (i.e., AST RAMpage Plus/286 or AST Premium/286 using Advanced
FastRAM), will not experience any of the difficulties outlined here.
Please note: It advisable to verify that the correct DESQview configuration
and operation procedures are followed. Appendix E in the DESQview Manual
contains detailed information about running communications programs.