Screen Output from C and Assembly Language
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     The PCBIOS terminal driver also overwrites all output from C and
     Assembly Language when it refreshes the screen from the screen buffer.
     Therefore, you should perform all screen output from CA-Clipper.

     The PCBIOS terminal driver also virtualizes the cursor.  This means that
     BIOS functions that report the location of the hardware cursor do not
     always return the correct value.  To obtain the cursor position, use
     CA-Clipper's ROW() and COL() functions.