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Transcode (character encoding)

From Wikipedia, the free encyclopedia

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 2780 data transmission terminal was announced with Transcode support in 1967. Its successor, the IBM 3780 data communication terminal, announced in 1972, dropped Transcode support and added a "space compression" option.

Transcode is a six-bit character code. It relates to IBM's punched card code but, like EBCDIC, it is not BCD. Its 64 values consist of the 26 uppercase letters, 10 numbers, 11 symbols, space, and 16 control characters. Its 48 printable characters are ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 .'-/@#$%&*⌑; it cannot represent ,:;!?"()[]<>+^=_\`{}|~. Characters are transmitted with odd parity. The 2780 cannot use the 16 control characters as data characters in Transcode mode.[1]

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Transcription

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.
This page was last edited on 1 March 2023, at 13:16
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