Re: Weird charset, TWX

From: Richard Verhoeven (rcb5@win.tue.nl)
Date: Fri Sep 26 1997 - 06:09:07 EDT


Tex Texin:
>
>This question came to me. The encoding is strange. I suspect that parity
>bits are confusing things and perhaps this is an encoding specific to
>Telex. Anyone have any ideas what this is?
>
>Does it make more sense when viewed on paper tape? ;-)
>tex
>
[ technical information removed ]
>
>Now, using their documentation, here's how the characters coming over
>the line decode:
>
> spc 05h 5 | '1' 8Dh 141 | 'M' B2h 178
> cr B1h 177 | '2' 4Dh 77 | 'N' 72h 114
> lf 51h 81 | '5' ACh 172 | 'O' F3h 243
> del FFh 255 | 'A' 82h 130 | 'P' 0Ah 10
> xon 89h 137 | 'B' 43h 67 | 'R' 4Bh 75
> xoff C9h 201 | 'C' C3h 195 | 'S' CAh 202
> wru A1h 161 | 'D' 22h 34 | 'T' 2Bh 43
> bel E1h 225 | 'E' A3h 163 | 'U' ABh 171
> '.' 74h 116 | 'F' 63h 99 | 'V' 6Ah 106
> '/' F5h 245 | 'H' 12h 18 | 'Y' 9Ah 154
> '-' B5h 181 | 'I' 93h 147
> '0' 0Ch 12 | 'L' 33h 51
>
>Do you have a clue as to what codepage this could be from?

It seems to be the ASCII encoding, but bit-reversed.

If you first reverse the bits and then remove the most significant bit,
you get a more useful ASCII encoding.

Richard.



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