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本文(ANSI INCITS ISO 3275-1974 Information Processing - Implementation of the 7-Bit Coded Character Set and its 7-Bit and 8-Bit Extensions on 3 81 mm Magnetic Cassette for Data Intercha.pdf)为本站会员(dealItalian200)主动上传,麦多课文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文库(发送邮件至master@mydoc123.com或直接QQ联系客服),我们立即给予删除!

ANSI INCITS ISO 3275-1974 Information Processing - Implementation of the 7-Bit Coded Character Set and its 7-Bit and 8-Bit Extensions on 3 81 mm Magnetic Cassette for Data Intercha.pdf

1、INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEXflYHAPOflHAR OPTAHA3AUMR IlO CTAHnAPTH3AUHW.ORGANISATION INTERNATIONALE DE NORMALISATION Information processing - Implementation of the 7-bit coded character set and its 7-bit and 8-bit extensions on 3,81 mm magnetic tape casse

2、tte for data interchange Traitement de Iinformation - Matkrialisation du jeu de caracttkes B 7 Bl coded character set : A set of unambiguous rules that establishes a character set and the one-to-one relationship between the characters of the set and their bit combinations. 3.5 code extension: Techni

3、ques for the encoding of characters that are not included in the character set of a given code. 3.6 environment: The characteristic that identifies the number of bits used to represent a character in a data processing or data communication system or in part of such a system. 4 RECORDING FORMAT Accor

4、ding to IS0 3407, the data to be interchanged are recorded serially by bit and by character. Each character is located in a byte of eight bit-positions along the track. The bit-positions in a byte are numbered from 1 to 8 in order of recording. The following diagram summarizes these concepts : byte

5、Bit-positions : . . . 32187654321876. Forward tape motion : -w Resulting recording direction : - 5 RECORDING OF 7-BIT CODED DATA Each 7-bit coded character is recorded in bit-positions 1 to 7 of a byte; bit-position 8 is recorded with value ZERO. The relationship is as follows : Bits of the 7-bit co

6、mbination : q 0 b7 bs b5 b4 b, b, bl Bit-position in the byte : 8 7 6 5 4 3 2 1 6 RECORDING OF 8-BIT CODED DATA Each g-bit coded character is recorded in bit-positions 1 to 8 of a byte. The relationship is as follows : Bits of the g-bit combination : a8 a7 a6 a5 a4 a3 a2 al Bit-position in the byte : 8 7 6 5 4 3 2 1 1) At present at the stage of draft. 1 Copyright American National Standards Institute Provided by IHS under license with ANSINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-

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