jemm unloaded

Could be any number of things causing it, does it say anything more? 'Jemm unloaded' is a pretty generic error/report it gives when exiting, especially when it crashes.
 
You're probably missing the /d: switch in your MSCDEX call, or possibly missing the needed config.sys line.
 
or it may be, like I usually found, that you're running a version of windows that doesn't support MS-DOS mode that well and has no CD-ROM support in native dos mode. Then it has to be added to the autoexec.bat and config.sys
 
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