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INT 29 - DOS 2+ internal - FAST PUTCHAR
        AL = character to display
Return: nothing
Notes:  this interrupt is called from the DOS output routines if output is
          going to a device rather than a file, and the device driver's
          attribute word has bit 4 (10h) set.
        COMMAND.COM v3.2 and v3.3 compare the INT 29 vector against the INT 20
          vector and assume that ANSI.SYS is installed if the segment is larger
        the default handler under DOS 2.x and 3.x simply calls INT 10/AH=0Eh
        the default handler under DESQview 2.2 understands the <Esc>[2J
          screen-clearing sequence, calls INT 10/AH=0Eh for all others
SeeAlso: INT 79