Transcode (character encoding)

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For other uses, see Transcode (disambiguation).

Six-Bit Transcode, or Six-Bit Transmission Code, was, for a few years, one of the three character sets used by IBM for Binary Synchronous Communications. Transmission using 6-bit Transcode had higher throughput than transmission using 8-bit EBCDIC or ASCII, provided that the data to be transmitted used a limited set of 48 characters.

The

IBM 3780 data communication
terminal, announced in 1972, dropped Transcode support and added a "space compression" option.

Transcode is a

odd parity. The 2780 cannot use the 16 control characters as data characters in Transcode mode.[1]

Code table

Six-Bit Transcode
0 1 2 3 4 5 6 7 8 9 A B C D E F
0x SOH A B C D E F G H I STX . ⌑ BEL SUB
ETB
1x & J K L M N O P Q R
SP
 		$ *
IUS/
ITB
EOT
 		DLE
2x - / S T U V W X Y Z ESC ' % ENQ
ETX
HT
3x 0 1 2 3 4 5 6 7 8 9
SYN
 		# @
NAK
 		EM DEL

Code table (from 2780 manual)

Character
 		 Punched card
code		 6-bit
transcode		 Hex 
SOH 12-9-1              P 00
A 12-1            5   01
B 12-2          4     02
C 12-3          4 5 P 03
D 12-4        3       04
E 12-5        3   5 P 05
F 12-6        3 4   P 06
G 12-7        3 4 5   07
H 12-8      2         08
I 12-9      2     5 P 09
STX 12-9-2      2   4   P 0A
. 12-8-3      2   4 5   0B
⌑ 12-8-4      2 3     P 0C
BEL 0-9-8-7      2 3   5   0D
Sub 9-8-7      2 3 4     0E
ETB 0-9-6      2 3 4 5 P 0F
& 12    1           10
J 11-1    1       5 P 11
K 11-2    1     4   P 12
L 11-3    1     4 5   13
M 11-4    1   3     P 14
N 11-5    1   3   5   15
O 11-6    1   3 4     16
P 11-7    1   3 4 5 P 17
Q 11-8    1 2       P 18
R 11-9    1 2     5   19
Space no punch    1 2   4     1A
$ 11-8-3    1 2   4 5 P 1B
* 11-8-4    1 2 3       1C
US 11-9-8-7    1 2 3   5 P 1D
EOT 9-7    1 2 3 4   P 1E
DLE 12-11-9-8-1    1 2 3 4 5   1F
- 11  0             20
/ 0-1  0         5 P 21
S 0-2  0       4   P 22
T 0-3  0       4 5   23
U 0-4  0     3     P 24
V 0-5  0     3   5   25
W 0-6  0     3 4     26
X 0-7  0     3 4 5 P 27
Y 0-8  0   2       P 28
Z 0-9  0   2     5   29
ESC 0-9-7  0   2   4     2A
' 0-8-3  0   2   4 5 P 2B
% 0-8-4  0   2 3       2C
ENQ 0-9-8-5  0   2 3   5 P 2D
ETX 12-9-3  0   2 3 4   P 2E
HT 12-9-5  0   2 3 4 5   2F
0 0  0 1         P 30
1 1  0 1       5   31
2 2  0 1     4     32
3 3  0 1     4 5 P 33
4 4  0 1   3       34
5 5  0 1   3   5 P 35
6 6  0 1   3 4   P 36
7 7  0 1   3 4 5   37
8 8  0 1 2         38
9 9  0 1 2     5 P 39
SYN 9-2  0 1 2   4   P 3A
# 8-3  0 1 2   4 5   3B
@ 8-4  0 1 2 3     P 3C
NAK 9-8-5  0 1 2 3   5   3D
EM 11-9-8-1  0 1 2 3 4     3E
DEL 12-9-7  0 1 2 3 4 5 P 3F

Devices using Transcode

References

  1. ^ IBM Corporation (1971). Component Description: IBM 2780 Communications Terminal (PDF). Archived (PDF) from the original on 2020-07-26.
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