公开(公告)号：US3668647A

公开(公告)日：1972-06-06

申请号：US3668647D

申请日：1970-06-12

Applicant: IBM

Inventor： EVANGELISTI CARLO J ,  RITTENHOUSE LARRY E

IPC: G06F17/30 ,  G11B20/12 ,  G11B27/10 ,  G11B27/11 ,  G11B27/32 ,  G06F15/40

CPC classification number: G06F17/30949 ,  G11B20/1252 ,  G11B27/105 ,  G11B27/11 ,  G11B27/329 ,  G11B2020/10916 ,  G11B2220/20 ,  G11B2220/65 ,  Y10S707/99931

Abstract: A system is shown wherein, provided with an appropriate file organization, a data file can be read from a disk master file, given the file name, by performing one seek and one read operation. The system employs hash coding to compress a data file name to a disk file address. The disk file is positioned into fixed length blocks where each hashed file address points to a block, the block being as large as one cylinder or as small as one sector. Each block is organized such that it includes a directory for the files contained in the block and also contains the data files. Each entry in the directory contains the data file name and the address of that data file in the block. The process of locating and reading a data file entails the hash coding of a file name to yield a block address, the moving of the read head to the disk area having the block address and the reading of the directory and the remainder of the block to read out the data file. In the directory reading, the data file names are compared in real time, as they are read from the disk, with the name of the desired data file. When a name match occurs, the address of the data file in the block and the address of the next file address are read and stored. As the disk rotates, the desired data file address just read is constantly compared with the active disk address. When a match occurs, the file has been located and is read out. The reading is terminated at the address of the beginning of the next file. If the file name is not found in the directory of the block indicated by the hash coding of the file''s name, then the file is not present therein.

Abstract translation: 显示了一种系统，其中提供有适当的文件组织，可以通过执行一个查找和一个读取操作，从给定文件名的磁盘主文件中读取数据文件。 系统采用哈希编码将数据文件名压缩为磁盘文件地址。 磁盘文件位于固定长度的块中，其中每个散列文件地址指向一个块，该块与一个柱面一样大，或者小至一个扇区。 每个块被组织，使得它包括用于包含在块中的文件的目录，并且还包含数据文件。 目录中的每个条目都包含数据文件名和块中该数据文件的地址。 定位和读取数据文件的过程需要文件名的哈希编码以产生块地址，将读头移动到具有块地址的磁盘区和将目录的剩余部分读取到 读出数据文件。 在目录读取中，数据文件名称被实时比较，因为它们是从磁盘读取的，具有所需数据文件的名称。 当发生名称匹配时，读取并存储块中数据文件的地址和下一个文件地址的地址。 当磁盘旋转时，刚刚读取的所需数据文件地址与活动磁盘地址不断进行比较。 当匹配发生时，文件已被找到并被读出。 读取结束于下一个文件开头的地址。 如果在由文件名的散列编码表示的块的目录中找不到文件名，则该文件不在其中。

公开(公告)号：US3680078A

公开(公告)日：1972-07-25

申请号：US3680078D

申请日：1969-12-23

Applicant: IBM

Inventor： BASKIN HERBERT B ,  BELADY LASZLO A ,  EVANGELISTI CARLO J ,  MORSE STEPHEN P

IPC: G06F3/038 ,  G06F3/14

CPC classification number: G06F3/0383

Abstract: A light pen arrangement is described wherein the light pen has three degrees of freedom, viz. two-dimensional translation in the (X,Y) plane of a cathode ray tube screen and rotation about the projection of its own longitudinal axis to the normal of the screen. To sense the angular position of the light pen, at least two independent light sensitive elements, i.e., fiber optic bundles are required, the latter being suitably provided by dividing the bundle of fiber optics emerging from a single light pen into at least two separate groups and having photosensitive transducer respectively associated with each of the separate groups. When the light pen is placed on the screen and its presence there is sensed, an (X,Y) value pair is stored for the location of each light sensitive area of the light pen, i.e., each of the aforementioned separate fiber optic groups. The storing is accomplished by having an electron beam draw lines or points in each light sensitive area and, receiving in response thereto, interrupts for points or lines in the field of view of each fiber optic group, the (X,Y) coordinate of each point or line causing an interrupt and the fiber optic group that picked up the interrupt is now known to the computer or other control arrangement controlling the cathode ray tube. The computer or control arrangement can then compute the (X,Y) location of the light pen as the centroid of the individual areas and the angular position of the pen.

Abstract translation: 描述了一种光笔布置，其中光笔具有三个自由度，即， 在阴极射线管屏幕的（X，Y）平面上进行二维平移，并且围绕其自身纵轴的投影相对于屏幕的法线旋转。 为了感测光笔的角度位置，需要至少两个独立的光敏元件，即光纤束，后者通过将从单个光笔出射的光纤束分成至少两个分开的组来适当地提供 并具有分别与每个单独组相关联的光敏传感器。 当光笔被放置在屏幕上并且其中存在时，存储用于光笔的每个光敏区域（即上述各个光纤组）的位置的（X，Y）值对。 存储是通过在每个光敏区域中具有电子束绘制线或点来实现的，并且响应于此而接收每个光纤组的视场中的点或线的中断，每个光纤组的（X，Y）坐标 导致中断的点或线，拾取中断的光纤组现在已知到控制阴极射线管的计算机或其他控制装置。 计算机或控制装置然后可以计算光笔的（X，Y）位置作为各个区域的重心和笔的角位置。