Test VM - t-dos20 - PC-DOS 2.0 on a harddisk
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Setup:
 - Create a default DOS VM 't-dos20', but restrict the disk size to 31MB.
 - Partition the disk with a single partition.
 - format C: /s
 - Install (copy?) the DOS files to C:\DOS
 - Copy DosSleep.exe and DosVmOff.com onto the disk.
 - Create config.sys if needed.
 - autoexec.bat (cannot test from test.bat, so all in one file):
       PATH C:\DOS;C:\
       ECHO ON
       ECHO TESTING chkdsk C: >COM1
       dossleep 1
       C:\DOS\CHKDSK C:
       ECHO PASSED>COM1
       ECHO Powering off VM in 5 seconds...
       DosSleep 1
       DosSleep 1
       DosSleep 1
       DosSleep 1
       DosSleep 1
 - More tests can be added, if desired.  If test failure can be detected, end
   with echoing 'FAILED' to COM1 instead of 'PASSED'.