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1. 发明授权

US4644418A Floppy disk control apparatus 失效
标题翻译：软盘控制装置
公开(公告)号：US4644418A
公开(公告)日：1987-02-17
申请号：US620622
申请日：1984-06-14
申请人： Haruhiko Banno , Koichi Dewa
发明人： Haruhiko Banno , Koichi Dewa
IPC分类号： G11B20/10 , G06F3/06 , G11B5/016 , G11B20/12 , G11B5/09
CPC分类号： G06F3/0607 , G06F3/0659 , G06F3/0676 , G11B20/1252 , G11B5/016 , G11B20/1217 , G11B2020/1087 , G11B2020/10916 , G11B2220/2508 , G11B2220/2512
摘要： When a FORMAT COMMAND is executed, a track density data indicating a track density of 96 TPI or 48 TPI is written into a discrimination area of a disk. When the disk is set into the FDD and is used, a CPU reads out track density data from the disk and produces a flag byte data, including the track density data, and stores it into a main memory. When SEEK COMMAND is executed, a track density of the disk is checked to see if it is 96 TPI or 48 TPI on the basis of the flag byte data. If it is determined that the disk of 48 TPI is set into the FDD for use in driving a disk of 96 TPI according to this discrimination, an FDC outputs a STEP signal for allowing the traveling distance of the head to be doubled as compared to an ordinary distance, thereby controlling the seeking operation by the FDD so as to assuredly move the head to a predetermined desired track.
摘要翻译：当执行格式命令时，将指示轨道密度为96TPI或48TPI的轨道密度数据写入盘的识别区域。当磁盘被设置为FDD并被使用时，CPU从盘读出磁道密度数据，并产生包括磁道密度数据的标志字节数据，并将其存储到主存储器中。执行SEEK COMMAND时，根据标志字节数据检查磁盘的磁道密度，以查看其是否为96 TPI或48 TPI。如果根据这种鉴别确定将48TPI的盘设置为用于驱动96TPI的盘的FDD中，则FDC输出STEP信号，以允许头的行进距离加倍从而通过FDD控制寻道操作，以便确保将头移动到预定的所需轨道。

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