31 Oct
2012
31 Oct
'12
12:10 a.m.
On 10/30/2012 04:37 PM, Brian Knittel wrote:
Here is what I've been able to map out so far,
from a small fragment of
an encoded source deck:
Hex value
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
00 sp A B C D E F G H I . )
10 + J K L M N O P Q R *
20 - / S T U V W X Y Z , (
30 0 1 2 3 4 5 6 7 8 9 =
It's almost IBM 6-bit BCD, organized by card punch codes, with some
interesting exceptions. For example, if it were strictly card code, the
"no zone punch row would be" sp 0123456789 and the "+" zone punch
would
be +ABCDEFGHI and the "-" zone ordering would be -nJKLMNOPQR and the
"0"
zone ordering would be /STUVWXYZ. "n" in the above refers to a
non-printing -0 combination, though various vendors had their own codes
for it. The remainder of the chart roughly corresponds to triple
punches, e.g., 12-8-3 for a period, 0-8-3 for a comma.
So it's card code, sort of. It doesn't correspond directly with any
standard 6-bit code that I recognize.
--Chuck