Transcode (character encoding)
Transcode, or Transmission Code, is a no longer used 6-bit plus parity BCD character set which was used by IBM for a short time for Binary Synchronous communications. The IBM 2780 data transmission terminal was announced with Transcode support in 1967. The IBM 3780 data communication terminal, the 2780 successor announced in 1972, dropped Transcode support.
Transcode was a 64 character set including twenty-six upper case alphabetic characters, ten numerics, thirteen special characters, and sixteen control characters. Characters were transmitted with odd parity.[1]
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 | 12-0-2 | 2 4 P | 0A |
. | 12-9-3 | 2 4 5 | 0B |
⌑ | 12-9-4 | 2 3 P | 0C |
BEL | 0-9-8-7 | 2 3 5 | 0D |
Sub | 9-8-7 | 2 3 4 | 0E |
ETB | 9-8-6 | 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 | 9-8-7 | 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
- IBM 2701 Data Adapter Unit.
- IBM 2703 Transmission Control.
- IBM 2780 Data Transmission Terminal.
- IBM System/370 model 135 Integrated Communications Adapter (ICA).
gollark: Unless it's the other <@801501741862223922>, I forget.
gollark: <@!433407274367713280> and all.
gollark: Ah, like my alts, yes.
gollark: I mean, it's not distinguishable from your end, so baaasically the same.
gollark: Well, *technically* they joined in 2020 and we erased your memory of them, but same thing.
References
- IBM Corporation (1971). Component Description: IBM 2780 Communications Terminal (PDF). Archived from the original (PDF) on 2011-09-29.
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