管理信息系統(tǒng)計(jì)算機(jī)硬件軟件-在線瀏覽
2024-10-23 16:50本頁(yè)面
【正文】 : 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 1 BLOCK 2 BLOCK 3 MAGNETIC TAPE ? ENCLOSED FERROUS OXIDE TAPE ? USED PERIODICALLY TO BACK UP RECORDS ? INEXPENSIVE ? STORED IN SAFE LOCATION ? CAN BE REUSED MAGNETIC CARTRIDGE ? CDROM: 500660 MEGABYTES –LAND: FLAT PARTS OF DISK SURFACE REFLECTS LIGHT –PITS: SMALL SCRATCH ON SURFACE SCATTERS LIGHT ? WORM: WRITE ONCE / READ MANY ? ERASABLE OPTICAL STORAGE (EOS) DISKS * OPTICAL STORAGE MULTIMEDIA WORKSTATION CDROM HEADPHONES STEREO SPEAKERS LEFT, RIGHT, WOOFER SUPER VGA MONITOR VIDEO BOARD + EXTRA MEMORY STEREO SOUND BOARD (32 BIT: WAV, MIDI, CD) AT LEAST 16 MG RAM (32 MG MUCH BETTER) JOYSTICK HARD DRIVE: 1 GIG OR MORE, JAZ DRIVE 通訊網(wǎng)絡(luò)的組成 “ Any one in the world could be your customer。 Media Computer 2 Tele softw are 五種基本部件 1. Terminals 2. Tele processors Modem, multiplexes amp。 decode data, Control the accuracy amp。 media Copper wires, Coaxial cable, Fiber optic cables, microwave’s system, Communications satellites. 4. Computers Mainframe, Host puters Miniputer Front end processors Microputer Network server 5. Telecontrol software Monitors (Mainframe) Network operating systems (Mi
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