Add a very natural, binary version of the ASCII table.

Reviewed by:	bcr, eadler
Obtained from:	https://garbagecollected.org/2017/01/31/four-column-ascii/
MFC after:	1 day
Differential Revision:	https://reviews.freebsd.org/D9902

share/man/man7/ascii.7

@@ -28,12 +28,12 @@
 .\"	@(#)ascii.7	8.1 (Berkeley) 6/5/93
 .\" $FreeBSD$
 .\"
-.Dd January 6, 2016
+.Dd March 10, 2017
 .Dt ASCII 7
 .Os
 .Sh NAME
 .Nm ascii
-.Nd octal, hexadecimal and decimal
+.Nd octal, hexadecimal, decimal and binary
 .Tn ASCII
 character sets
 .Sh DESCRIPTION
@@ -102,6 +102,46 @@ set:
 112  p   113  q   114  r   115  s   116  t   117  u   118  v   119  w
 120  x   121  y   122  z   123  {   124  |   125  }   126  ~   127 DEL
 .Ed
+.Pp
+The
+.Nm binary
+set:
+.Bd -literal -offset left
+ 00     01     10     11
+
+NUL     SP      @      `     00000
+SOH      !      A      a     00001
+STX      "      B      b     00010
+ETX      #      C      c     00011
+EOT      $      D      d     00100
+ENQ      %      E      e     00101
+ACK      &      F      f     00110
+BEL      '      G      g     00111
+ BS      (      H      h     01000
+ HT      )      I      i     01001
+ LF      *      J      j     01010
+ VT      +      K      k     01011
+ FF      ,      L      l     01100
+ CR      -      M      m     01101
+ SO      .      N      n     01110
+ SI      /      O      o     01111
+DLE      0      P      p     10000
+DC1      1      Q      q     10001
+DC2      2      R      r     10010
+DC3      3      S      s     10011
+DC4      4      T      t     10100
+NAK      5      U      u     10101
+SYN      6      V      v     10110
+ETB      7      W      w     10111
+CAN      8      X      x     11000
+ EM      9      Y      y     11001
+SUB      :      Z      z     11010
+ESC      ;      [      {     11011
+ FS      <      \      |     11100
+ GS      =      ]      }     11101
+ RS      >      ^      -     11110
+ US      ?      _    DEL     11111
+.Ed
 .Sh FILES
 .Bl -tag -width /usr/share/misc/ascii -compact
 .It Pa /usr/share/misc/ascii