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DDJ0992.ARJ
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READ.ME
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DB Notes
XUD Command
-----------
You must exercise caution when using XUD. If you have directed DB to
generate a break point in the middle of a service which your debugger
uses (perhaps one involving video or the keyboard), you may
crash when attempting to re-enter such code.
Also, don't use XUD in places where you should use Q (Quit). For example,
you may see problems if while in your debugger, you hot key into DB, and
then return with XUD.
Booting
-------
Code needs to be added to DB to handle doing a warm boot. For now, you
will have to do a hard reset.
DPMI
----
DB is not DPMI compliant and cannot coexist with other protected mode
programs.
Software Versions
-----------------
DB was developed using MASM 5.10. The CodeView referenced in the article
is version 2.2.
Known Bugs
----------
1. When using DB with another debugger, do not trace across an I/O instruction
on which DB has been directed to generate a break point (code needs to be
added within the I/O detection portion of DB to determine that a trace within
the user debugger is occuring). Tracing across other break points defined
with DB should be ok.
2. Do not set R/W (Write only is ok) data access break points on addresses in
the interrupt vector range (code needs to be added to DB to disable break
points of this type while the protected mode exception handlers are
active).