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1993-06-05
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ARTICLE-ID:Q93655
TITLE :Changes to MS-DOS 6.0 MSCDEX Version 2.22
--------------------------------------------------------------------
The information in this article applies to:
- Microsoft MS-DOS operating system version 6.0
--------------------------------------------------------------------
Summary:
MS-DOS 6.0 provides a new version of MSCDEX, which is version 2.22.
The following changes were implemented when MSCDEX.EXE was revised
from version 2.21 to version 2.22:
- MSCDEX now loads into UMA using "lh mscdex ..."
- MSCDEX is no longer version dependent
- The /V switch now reports reasonable memory statistics
- Cosmetic changes
More Information:
MSCDEX Now Loads into UMA Using "lh mscdex ..."
-----------------------------------------------
If there is enough memory available, MSCDEX version 2.21 and earlier
can load into upper memory. MSCDEX version 2.21 and earlier require
the load size of MSCDEX (which varies for different configurations)
plus 48K of memory to load. Development added the 48K requirement to
ensure there is enough memory to load COMMAND.COM.
Therefore you need to have a block of memory (conventional or upper)
equal to the MSCDEX load size plus 48K to load version 2.21 or
earlier.
MSCDEX version 2.22 checks to see if the driver is being loaded above
640K. If it is, MSCDEX does not add 48K to the initialization load
size because it doesn't need to be concerned with the transient
portion of COMMAND.COM.
MSCDEX Is No Longer Version Dependent
-------------------------------------
If you are using MS-DOS 5.0 or 6.0, earlier version of MSCDEX require
you use SETVER.EXE to tell MSCDEX the MS-DOS version is 4.0.
This is no longer required with version 2.22.
The /V Switch Now Reports Reasonable Memory Statistics
------------------------------------------------------
The /V switch now reports accurate memory statistics. Earlier versions
of MSCDEX were not accurate.
Cosmetic Changes
----------------
The version number incremented from 2.21 to 2.22 and the copyright
message has been updated to include 1993.
Additional reference words: 6.0