Table of Contents
Advertisement
USER'S GUIDE
DATA TRANSMISSION CODES
voke repeats, the sequential nature of the code made its efficiency rate less than desirable.
EBCDIC
Extended Binary-Coded Decimal Interchange Code was developed in 1962. It uses 8 bits which
makes it capable of transmitting 256 characters. But for communications EBCDIC might be
deemed a backward step because it has no parity capability. Users who don't need all 256 charac-
ters have redefined the code, using EBCDIC as a base and identifying particular characters with
odd or even parity bits. Although there are occasional compatibility problems because of parity def-
initions varying between users, EBCDIC is still widely used in data processing communications sys-
tems.
Still Other Codes
Several other data codes are in use today, some of them dating back decades. Hollerith Code, de-
veloped more that 80 years ago, is still used commercially and Is generally associated with punch
card systems. There are others such as Jaquard Code, Moore ARQ code, Syntoc code, AP code and
others too numerous to list here.
PK232UG Rev. E 9/87
G-4
192
Advertisement
Table of Contents
