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1990-05-14
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2KB
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60 lines
MXSUB.EXE - Microsoft Extensions Substitute (May 1990)
By
Digital Solutions Pty Ltd
PO Box 178
Margate
Qld 4019
AUSTRALIA
Tel (Int.) 61-7-883-1851
The Problem.....
While LANtastic supports CD-ROMs on work stations without Microsoft Extensions
(MSCDEX.EXE) being loaded, some programs for accessing CD-ROMs make requests to
MSCDEX for certain information. These programs would abort on work stations
because MSCDEX was not present.
The Solution.....
We wrote MXSUB.EXE as a substitute for MSCDEX on work stations. As a general
rule (though not necessarily the case) CD-ROM programs read the CD-ROM via
normal DOS calls. However, several (World Book's Infofinder was one) ask
MSCDEX for the number of CDs actually available (Sub-function 0h) and what the
associated drive letters are for those CDs (sub-function 0Dh). MXSUB sets
these values via parameters at load-time, and services these Int 2Fh function
15h calls according to these parameters.
The Usage.....
Let's say you have two CD-ROMs, set by Net Use commands as drives S: and W:.
You would then load MXSUB like this...
MXSUB S W
...MXSUB will then report back to you the fact that it installed successfully
and the drive letters it will supply as available. Note that it does NOT
actually service requests to these drives, merely reports their presence and
number as previously described.
MXSUB uses about 5K of RAM, and should be loaded before you run your CD
software. Do NOT load MSCDEX or your CD Driver (.SYS file) on your work
station, only on the server.
MXSUB worked for Infofinder (World Book), Groliers Encyclopaedia and CDATA86
(Australian Census). If a program makes a call to a MSCDEX sub-function other
than 0h or 0Dh, MXSUB will abort the program, showing the full register
information, particularly the sub-function called, at the top of the screen.
If this happens, PLEASE WRITE IT DOWN exactly as it appears, and write to us or
phone, and tell us also what program you were running. We will endeavour to
add this sub-function to the list supported by MXSUB.
Kind Regards,
Daniel Churchman
National Sales Manager - LANtastic
(AUSTRALIA)