INT 68 - APPC/PC - SET TRACE DESTINATION
        AH = FEh
        AL = trace destinations (see below)
        DS:DX -> trace stats record if AL bit 0 set
SeeAlso: AH=FCh,AH=FDh

Bitfields for trace destinations:
 bit 0  storage (DS:DX -> trace stats record)
 bit 1  display
 bit 2  file (trace written to file OUTPUT.PC)
 bit 3  printer

Format of Trace Statistics Record:
Offset  Size    Description
 00h    DWORD   pointer to storage trace buffer
 04h    WORD    max number of 80-byte records in trace
 06h    WORD    (high-order byte first!) current record number (must init to 0)
 08h    DWORD   (high-order byte first!) number of records written (init to 0)
 0Ch    DWORD   reserved
Note:   do not move record while trace is active

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