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 SYSTEM

 The System functions provide routines to determine the computer's
 configuration and set certain system options.  They can be used to
 tell how many how many ports are available, the video adaptor
 installed, and the DOS version.  The video mode and system date and
 time can be returned or set as well as the keyboard repeat rate.

 C_GETVIDEO()        C_DOSVER()
 C_GETMODE()         C_ISMATH()
 C_SETMODE()         C_KEYRATE()
 C_GETSER()          C_SYSDATE()
 C_GETPAR()          C_SYSTIME()
 C_GETGAME()         C_SYSDAY()
 C_GETRAM()          C_PRNTSCRN()