管理信息系統(tǒng)計(jì)算機(jī)硬件軟件-文庫(kù)吧
2025-07-17 16:50 本頁(yè)面
【正文】 nagement Management Management service ?機(jī)器語(yǔ)言 (Machine Language) ?匯編語(yǔ)言 (Assembler Language) ?高級(jí)語(yǔ)言 (HighLevel Language) ?第四代語(yǔ)言 (FourthGeneration Language) 計(jì)算機(jī)語(yǔ)言 (Programming Language) 機(jī)器語(yǔ)言 高級(jí)語(yǔ)言 1010 11001 Basic: X=Y+Z 1011 11010 COBOL: 1100 11011 COMPUTE X=Y+Z 匯編語(yǔ)言 4GL LOD Y Sum The ADD Z Following Numbers STR X Y, Z 軟件發(fā)展趨勢(shì) SOFT WARE TREND 1. Use of offshelf software package acquired by users from software venders. 用商用軟件包 . 2. Toward nonprocedural natural languages that are closer to human conversation. 非過(guò)程自然語(yǔ)言 . Graphics and Artificial intelligence. Fifth generation language. Powerful, multipurpose, expertassistant software packages with natural language and graphical interface for end users. ?DISK ?TAPE ?OPTICAL STORAGE SECONDARY STORAGE TRACKS START OF TRACKS DIRECTORY ON TRACK 0 SECTOR EACH TRACK HOLDS SAME AMOUNT OF DATA TRACKS AND SECTORS Source: Senn, Information Technology in Business1995 DISK PACK STORAGE ? LARGE SYSTEMS ? RELIABLE STORAGE ? LARGE AMOUNTS OF DATA ? QUICK ACCESS amp。 RETRIEVABLE ? TYPICAL: 11 2SIDED DISKS ? CYLINDER: SAME TRACK ALL SURFACES CYLINDER 10: TRACK 10 (TOP AND BOTTOM OF EACH DISK) DISK 1 DISK 2 DISK 3 DISK 4 DISK 5 READ/WRITE HEADS ? STANDARD FOR SEQUENTIAL FILES ? SPOOL OF PLASTIC TAPE COVERED WITH FERROUS OXIDE (2400 feet per spool) ? RECORD GROUPS: BLOCKING FACTOR (., 10 records per block) ? GROUPS SEPARATED BY INTERBLOCK GAP ? RECORDS READ BLOCK AT A TIME * HEADER IBG BLOCK
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