bit-paired keyboard
 n.,obs.

    (alt.: bit-shift keyboard) A non-standard keyboard layout that seems to
    have originated with the Teletype ASR-33 and remained common for several
    years on early computer equipment. The ASR-33 was a mechanical device (see
    EOU), so the only way to generate the character codes from keystrokes was
    by some physical linkage. The design of the ASR-33 assigned each character
    key a basic pattern that could be modified by flipping bits if the SHIFT or
    the CTRL key was pressed. In order to avoid making the thing even more of a
    kluge than it already was, the design had to group characters that shared
    the same basic bit pattern on one key.

    Looking at the ASCII chart, we find:

    high  low bits
    bits  0000 0001 0010 0011 0100 0101 0110 0111 1000 1001
     010        !    "    #    $    %    &    '    (    )
     011   0    1    2    3    4    5    6    7    8    9

    This is why the characters !"#$%&'() appear where they do on a Teletype
    (thankfully, they didn't use shift-0 for space). The Teletype Model 33 was
    actually designed before ASCII existed, and was originally intended to use
    a code that contained these two rows:

          low bits
    high  0000  0010  0100  0110  1000  1010  1100  1110
    bits     0001  0011  0101  0111  1001  1011  1101  1111
      10   )  ! bel #  $  % wru &  *  (  "  :  ?  _  ,   .
      11   0  1  2  3  4  5  6  7  8  9  '  ;  /  - esc del

    The result would have been something closer to a normal keyboard. But as it
    happened, Teletype had to use a lot of persuasion just to keep ASCII, and
    the Model 33 keyboard, from looking like this instead:

              !  "  ?  $  '  &  -  (  )  ;  :  *  /  ,  .
           0  1  2  3  4  5  6  7  8  9  +  ~  <  >  ?  |

    Teletype's was not the weirdest variant of the QWERTY layout widely seen,
    by the way; that prize should probably go to one of several (differing)
    arrangements on IBM's even clunkier 026 and 029 card punches.

    When electronic terminals became popular, in the early 1970s, there was no
    agreement in the industry over how the keyboards should be laid out. Some
    vendors opted to emulate the Teletype keyboard, while others used the
    flexibility of electronic circuitry to make their product look like an
    office typewriter. Either choice was supported by the ANSI computer
    keyboard standard, X4.14-1971, which referred to the alternatives as ?
    logical bit pairing? and ?typewriter pairing?. These alternatives became
    known as bit-paired and typewriter-paired keyboards. To a hacker, the
    bit-paired keyboard seemed far more logical ? and because most hackers in
    those days had never learned to touch-type, there was little pressure from
    the pioneering users to adapt keyboards to the typewriter standard.

    The doom of the bit-paired keyboard was the large-scale introduction of the
    computer terminal into the normal office environment, where out-and-out
    technophobes were expected to use the equipment. The typewriter-paired
    standard became universal, X4.14 was superseded by X4.23-1982, bit-paired
    hardware was quickly junked or relegated to dusty corners, and both terms
    passed into disuse.

    However, in countries without a long history of touch typing, the argument
    against the bit-paired keyboard layout was weak or nonexistent. As a
    result, the standard Japanese keyboard, used on PCs, Unix boxen etc. still
    has all of the !"#$%&'() characters above the numbers in the ASR-33 layout.

bit-paired keyboard

    (Obsolete, or "bit-shift keyboard") A non-standard
   keyboard layout that seems to have originated with the Teletype
   ASR-33 and remained common for several years on early computer
   equipment.  The ASR-33 was a mechanical device (see EOU), so the
   only way to generate the character codes from keystrokes was by
   some physical linkage.  The design of the ASR-33 assigned each
   character key a basic pattern that could be modified by flipping
   bits if the SHIFT or the CTRL key was pressed.  In order to avoid
   making the thing more of a Rube Goldberg kluge than it already
   was, the design had to group characters that shared the same basic
   bit pattern on one key.

   Looking at the ASCII chart, we find:

    high  low bits
    bits  0000 0001 0010 0011 0100 0101 0110 0111 1000 1001
    010        !    "    #    $    %    &    '    (    )
    011   0    1    2    3    4    5    6    7    8    9

   This is why the characters !"#$%&'() appear where they do on a
   Teletype (thankfully, they didn't use shift-0 for space).
   This was *not* the weirdest variant of the QWERTY layout
   widely seen, by the way; that prize should probably go to one
   of several (differing) arrangements on IBM's even clunkier
   026 and 029 card punches.

   When electronic terminals became popular, in the early
   1970s, there was no agreement in the industry over how the
   keyboards should be laid out.  Some vendors opted to emulate
   the Teletype keyboard, while others used the flexibility of
   electronic circuitry to make their product look like an office
   typewriter.  These alternatives became known as "bit-paired"
   and "typewriter-paired" keyboards.  To a hacker, the
   bit-paired keyboard seemed far more logical - and because most
   hackers in those days had never learned to touch-type, there
   was little pressure from the pioneering users to adapt
   keyboards to the typewriter standard.

   The doom of the bit-paired keyboard was the large-scale
   introduction of the computer terminal into the normal office
   environment, where out-and-out technophobes were expected to
   use the equipment.  The "typewriter-paired" standard became
   universal, "bit-paired" hardware was quickly junked or
   relegated to dusty corners, and both terms passed into disuse.

   [Jargon File]

   (1995-02-20)