HelpPC 2.10 Quick Reference Utility Copyright 1991 David Jurgens

             INT 29 - DOS Fast Character I/O  (Undocumented 2.x+)

       AL = character to write

       returns nothing ???

       - used by DOS device drivers to output data to the screen if
         bit 4 of the device attribute word is set
       - similar to INT 21,2 and INT 21,9 but much faster
       - simply calls the BIOS INT 10,E in DOS versions 2.x and 3.x
       - advances the cursor after character output

Esc or Alt-X to exit int 29 Home/PgUp/PgDn/End ←↑↓→