Revision as of 00:37, 23 April 2021 edit A876 (talk \| contribs) Extended confirmed users 10,500 edits rewording. not BCD (see BCD article). ← Previous edit		Revision as of 20:10, 23 April 2021 edit undo A876 (talk \| contribs) Extended confirmed users 10,500 edits mention 3780 space compression. listed character set and omissions. corrected errors in punch-codes. added code table similar to other 6-bit codes. Next edit →
Line 1: {{Other uses\|Transcode (disambiguation)}} {{Use dmy dates\|date=May 2019\|cs1-dates=y}} '''Six-Bit Transcode''', or '''Six-Bit Transmission Code''', was, for a ~~short~~a few ~~time~~years, one of the three [[character encoding\|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 2780#3780\|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 (character encoding)\|BCD]]. Its 64 values consist of the 26 uppercase letters, 10 numbers, 11 symbols, [[space (character)\|space]], and 16 [[control character]]s. Its 48 printable characters are <code>ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 @#$%&-/'.⌑</code>; it cannot represent <code>+<=>^!"(),:;?[]_{}</code>. Characters are transmitted with [[odd parity]]. The 2780 cannot use the 16 control characters as data characters in Transcode mode.<ref>{{cite book \|last=IBM Corporation \|title=Component Description: IBM 2780 Communications Terminal \|year=1971 \|url=http://computer-refuge.org/bitsavers/pdf/ibm/27xx/GA27-3005-3-2780_Data_Terminal_Description_Aug71.pdf \|url-status=dead \|archive-url=https://web.archive.org/web/20110929024649/http://computer-refuge.org/bitsavers/pdf/ibm/27xx/GA27-3005-3-2780_Data_Terminal_Description_Aug71.pdf \|archive-date=September 29, 2011}}</ref> Characters are shown with their [[Unicode]] equivalents. {\| {{chset-tableformat}} {{chset-table-header\|Six-Bit Transcode}} \|- !{{chset-left2\|0_}} \|{{chset-color-ctrl}}\|{{chset-ctrl\|0001\|{{Control code link\|SOH}}}} \|{{chset-color-letter}}\|{{chset-cell\|0041\|[[A]]\|1}} \|{{chset-color-letter}}\|{{chset-cell\|0042\|[[B]]\|2}} \|{{chset-color-letter}}\|{{chset-cell\|0043\|[[C]]\|3}} \|{{chset-color-letter}}\|{{chset-cell\|0044\|[[D]]\|4}} \|{{chset-color-letter}}\|{{chset-cell\|0045\|[[E]]\|5}} \|{{chset-color-letter}}\|{{chset-cell\|0046\|[[F]]\|6}} \|{{chset-color-letter}}\|{{chset-cell\|0047\|[[G]]\|7}} \|{{chset-color-letter}}\|{{chset-cell\|0048\|[[H]]\|8}} \|{{chset-color-letter}}\|{{chset-cell\|0049\|[[I]]\|9}} \|{{chset-color-ctrl}}\|{{chset-ctrl\|0002\|{{Control code link\|STX}}}} \|{{chset-color-punct}}\|{{chset-cell\|002E\|[[Full stop\|.]]}} \|{{chset-color-punct}}\|{{chset-cell\|2311\|[[Lozenge\|⌑]]}} \|{{chset-color-ctrl}}\|{{chset-ctrl\|0007\|{{Control code link\|BEL}}}} \|{{chset-color-ctrl}}\|{{chset-ctrl\|001A\|{{Control code link\|SUB}}}} \|{{chset-color-ctrl}}\|{{chset-ctrl\|0017\|{{Control code link\|ETB}}}} \|- !{{chset-left2\|1_}} \|{{chset-color-punct}}\|{{chset-cell\|0026\|[[Ampersand\|&]]}} \|{{chset-color-letter}}\|{{chset-cell\|004A\|[[J]]}} \|{{chset-color-letter}}\|{{chset-cell\|004B\|[[K]]}} \|{{chset-color-letter}}\|{{chset-cell\|004C\|[[L]]}} \|{{chset-color-letter}}\|{{chset-cell\|004D\|[[M]]}} \|{{chset-color-letter}}\|{{chset-cell\|004E\|[[N]]}} \|{{chset-color-letter}}\|{{chset-cell\|004F\|[[O]]}} \|{{chset-color-letter}}\|{{chset-cell\|0050\|[[P]]}} \|{{chset-color-letter}}\|{{chset-cell\|0051\|[[Q]]}} \|{{chset-color-letter}}\|{{chset-cell\|0052\|[[R]]}} \|{{chset-color-misc}}\|{{chset-ctrl\|0020\|[[Space character\|SP]]}} \|{{chset-color-graph}}\|{{chset-cell\|0024\|[[Dollar sign\|$]]}} \|{{chset-color-punct}}\|{{chset-cell\|002A\|[[Asterisk\|]]}} \|{{chset-color-ctrl}}\|{{chset-ctrl\|001F\|{{Control code link\|US\|ius}}/{{Control code link\|IUS/ITB\|itb}}}} \|{{chset-color-ctrl}}\|{{chset-ctrl\|0004\|{{Control code link\|EOT}}}} \|{{chset-color-ctrl}}\|{{chset-ctrl\|0010\|{{Control code link\|DLE}}}} \|- !{{chset-left2\|2_}} \|{{chset-color-punct}}\|{{chset-cell\|002D\|[[Hyphen-minus\|-]]}} \|{{chset-color-punct}}\|{{chset-cell\|002F\|[[Slash (punctuation)\|/]]}} \|{{chset-color-letter}}\|{{chset-cell\|0053\|[[S]]}} \|{{chset-color-letter}}\|{{chset-cell\|0054\|[[T]]}} \|{{chset-color-letter}}\|{{chset-cell\|0055\|[[U]]}} \|{{chset-color-letter}}\|{{chset-cell\|0056\|[[V]]}} \|{{chset-color-letter}}\|{{chset-cell\|0057\|[[W]]}} \|{{chset-color-letter}}\|{{chset-cell\|0058\|[[X]]}} \|{{chset-color-letter}}\|{{chset-cell\|0059\|[[Y]]}} \|{{chset-color-letter}}\|{{chset-cell\|005A\|[[Z]]}} \|{{chset-color-ctrl}}\|{{chset-ctrl\|001B\|{{Control code link\|ESC}}}} \|{{chset-color-punct}}\|{{chset-cell\|0027\|[[Apostrophe\|']]}} \|{{chset-color-punct}}\|{{chset-cell\|0025\|[[Percent sign\|%]]}} \|{{chset-color-ctrl}}\|{{chset-ctrl\|0005\|{{Control code link\|ENQ}}}} \|{{chset-color-ctrl}}\|{{chset-ctrl\|0003\|{{Control code link\|ETX}}}} \|{{chset-color-ctrl}}\|{{chset-ctrl\|0009\|{{Control code link\|HT}}}} \|- !{{chset-left2\|3_}} \|{{chset-color-digit}}\|{{chset-cell\|0030\|[[0]]}} \|{{chset-color-digit}}\|{{chset-cell\|0031\|[[1]]}} \|{{chset-color-digit}}\|{{chset-cell\|0032\|[[2]]}} \|{{chset-color-digit}}\|{{chset-cell\|0033\|[[3]]}} \|{{chset-color-digit}}\|{{chset-cell\|0034\|[[4]]}} \|{{chset-color-digit}}\|{{chset-cell\|0035\|[[5]]}} \|{{chset-color-digit}}\|{{chset-cell\|0036\|[[6]]}} \|{{chset-color-digit}}\|{{chset-cell\|0037\|[[7]]}} \|{{chset-color-digit}}\|{{chset-cell\|0038\|[[8]]}} \|{{chset-color-digit}}\|{{chset-cell\|0039\|[[9]]}} \|{{chset-color-ctrl}}\|{{chset-ctrl\|0016\|{{Control code link\|SYN}}}} \|{{chset-color-punct}}\|{{chset-cell\|0023\|[[Number sign\|#]]}} \|{{chset-color-punct}}\|{{chset-cell\|0040\|[[At sign\|@]]}} \|{{chset-color-ctrl}}\|{{chset-ctrl\|0015\|{{Control code link\|NAK}}}} \|{{chset-color-ctrl}}\|{{chset-ctrl\|0019\|{{Control code link\|EM }}}} \|{{chset-color-ctrl}}\|{{chset-ctrl\|007F\|{{Control code link\|DEL}}}} \|} {{chset-legend}} {\| class="wikitable" style="font-family: 'Courier New';" Line 30 ⟶ 109: \| I \|\| 12-9 \|\|      2     5 P \|\| 09 \|- \| STX \|\| 12-09-2 \|\|      2   4   P \|\| 0A \|- \| . \|\| 12-98-3 \|\|      2   4 5   \|\| 0B \|- \| ⌑ \|\| 12-98-4 \|\|      2 3     P \|\| 0C \|- \| BEL \|\| 0-9-8-7 \|\|      2 3   5   \|\| 0D Line 40 ⟶ 119: \| Sub \|\| 9-8-7 \|\|      2 3 4     \|\| 0E \|- \| ETB \|\| 90-89-6 \|\|      2 3 4 5 P \|\| 0F \|- \| & \|\| 12 \|\|    1           \|\| 10 Line 94 ⟶ 173: \| Z \|\| 0-9 \|\|  0   2     5   \|\| 29 \|- \| ESC \|\| 90-89-7 \|\|  0   2   4     \|\| 2A \|- \| ' \|\| 0-8-3 \|\|  0   2   4 5 P \|\| 2B

Transcode (character encoding): Difference between revisions