Control and Escape codes for the IBM Personal Computer Printers
 
 Ascii #   Effect
 -------   ------
   14      SO  - Double width, canceled by CR, LF or DC4
   15      SI  - Compressed print mode
   18      DC2 - Compressed off
   20      DC4 - Double width off
   24      CAN - Clears the printer buffer. Also cancels SO
   27      ESC - Printer command character
 
  ESC +    Effect
 -------   ------
    -      ESC -;n; (Graphics printer only) 1 turns underline on, 0
                 it off
    0      1/8 inch line feeding
    1      7/72 inch line feeding
    2      Executes effects of ESC A; if no ESC A issued, sets 1/6 inch
    3      ESC 3;n; (Graphics printer only) n sets n/216 inch linefeeds
    6      (Graphics printer only) Selects character set 2
    7      (Graphics printer only) Selects character set 1
    8      Make printer ignore Paper End switch
    9      Cancel ESC 8
    <      (Graphics printer only) Return printhead to left margin
    A      ESC A;n; n sets n/72 inch linefeeds, must activate with ESC 2
    B      ESC B;n1;n2;...;NUL; (Matrix printer only) Sets vertical tab
                 stops, used with ^K. Acts as linefeed if no stops set.
    C      ESC C;n; Sets page length, max of 127 lines per page
    D      ESC D;n1;n2;...;NUL; Sets horizontal tab stops, used with ^I.
                 Both vertical & horizontal stops must be ascending
    E      Emphasized print mode. Also slows to half speed
    F      Cancel ESC E
    G      Double Strike mode
    H      Cancel ESC G
    J      ESC J;n; (Graphics printer only) n sets n/216 inch linefeeds,
                 canceled by the linefeed which occurs
    K      ESC K;n1;n2;v1;v2;... (Graphics printer only) Sets 480 bit
                 image graphics mode. n1+256n2 tells how many v's follow,
                 and cannot exceed 480
    L      Sets 960 bit image graphics mode. As with ESC K, but 960 bits
    N      ESC N;n; Skip n lines on perforations
    O      cancel ESC N
    S      ESC S;n; (Graphics printer only) Subscript if n=1, superscript
                 if n=0
    T      Cancel ESC S
    U      ESC U;n; n=1 sets left-right printing only. n=0 cancels
    W      ESC W;n; (Graphics printer only) n=1 sets "permanent" double-
                 width mode. n=0 cancels
    Y      Normal speed ESC L, but cannot print 2 consecutive dots
    Z      Sets 1920 bit image graphics mode. Can only print every 3rd
                 dot position.