Hardware requirements:
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Due to Clipper internal dyamic overlay system you have not to check the
exe file size. You can run a 5MB exe file in 450Kb RAM, but internal VMM
(Virtual Memory Manager) often accesses the HDD. For your programs the
minimal configuration is AT286, 12MHz, 1MB RAM. The XT computers are too
slowly for database aplications. I recomend to use maximal amount of memory
as disk cache, with 1MB RAM it can be 640kB for DOS and 384kB for cache
(it is better to use some WRITE-THROUGH cache with deferred write).

Your config.sys should contain the lines:
                  FILES=79
                  COUNTRY=41,,COUNTRY.SYS
The amount of FILES is high because the Object.lib maintains the database
files opened till finishing the program. The Country is used for Central
European date format: DD.MM.YY (default clipper format is american MM.DD.YY)

Autoexec.bat should contain :
                  SET CLIPPER=E0;F:69;
The line (SET...) supresses the use of EMS memory
(if you have memory enough can be changed) and it is enabled to open 69 files.