17 Jun
2008
17 Jun
'08
8:05 p.m.
Could this thing be doing a modification of the
old teletype codes?
Sone if the really easier machines used modifications on the Baudaut set.
Actually as far as I've seen, no Teletype machines actually used Baudot
code or variants thereof. They all use variants of Marray code, similar
to ITA2.
The only substantive similarities between Baudot code and Murray code
I have an old set of books that describe the 'Baudot Quadruplex' (time
division multiplexed, done by mechanically rotated seelctors) in great
detail, and whihc give the character codes (in this machine, you used a
5-key 'chording' keybboard, not a normal alphanumeric one, so you had to
know the bit patterns).
Of course I also haev a Murray/ITA2 table.
And there are, as far as I can see, no characters that are the same. Even
the letter/figures shift equivanlence is totally different (in the
Murray code, the digits are assigned to the figures shift of Q...P in the
obvious way, so the top row of a 3-row alpha keyboard becomes the digits
in figures shift. In baudot code, this is not the case).
are that both are five-level codes and both use
letters and figures
shifts.
Not even that is idetncial. In Murray code, the 'shift' codes change the
state of the decoding/printing mechanism, but do noting else. In Baudot
code, they print a space. That is, there's a 'figures apce' which select
figures and prints a space, there's also 'letters space' which does the
obvious. There is no other space character. And there are no carriage
returen or linefeed codes, becuase the baudot printer printed on a paper
tape
-tony