Re: Weird charset, TWX

From: Robert_Ullmann/CAM/
Date: Fri Sep 26 1997 - 13:30:22 EDT


I'm not sure what code page it is exactly, but the bits are reversed. Take
the first 7 bits of each character and reverse them, and it will begin to
make sense. Remember that in async, the LSB is sent first, so that for
example, 7 bit ASCII capital T (54 hex, 101100) is sent on the wire as
<start>, 0, 0, 1, 0, 1, 0, 1, <parity>, <stop> (with variations for
mark/space parity, adn differnt numbers of stops).

If you read this backwards, you will get either hex 2A or 2B (you're
getting 2A). It doesn't look like either even or odd parity, once you look
at the other code points, so I don't know what is going on. But the first 7
bits make sense assuming something like ASCII-7 which is what is/was used
on TWX.

Robert Ullmann

(Who will always be peeved that people who've learned to write "cool" HTML
or Java think they know *anything* about computers or communications.)

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