Follow these instructions to build the GEM sources.

Unpack the files in Gemfull.zip using the directory option.
change directory to 
\gem\mrs\gem3x\desktop\disk1of3
to build the desktop;
unpack Deskfix.zip to directory.
find tools:- 
Hc.exe
link86.exe
rasm86.exe
and add to directory.
run makedesk.bat from Ken Mauro's desfix.zip
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change directory \gem3x\aes
make a new directory eg tryaes
copy contents of \aes\disk1of2 and \aes\disk2of2 to new directory
copy tools to directory viz:-
Hc.exe
link86.exe
rasm86.exe
and Hc.pro from deskfix.zip
run the batch file COMP30.BAT
rename GEM30.EXE to GEM.EXE
**************************************************
change directory to \gem3x\gdos
copy tools 
link86.exe
rasm86.exe
run the attcahed batchfile gvdi.bat
