公开(公告)号：DE3578470D1

公开(公告)日：1990-08-02

申请号：DE3578470

申请日：1985-09-10

Applicant: IBM

Inventor： BEAVEN PAUL ANTHONY ,  HAWES ADRIAN JOHN ,  LLEWELYN ROGER JAMES

IPC: G06F3/153 ,  G09G5/24 ,  G09G5/36 ,  G09G5/40 ,  G09G1/16

Abstract: A graphics display apparatus with a combined bit buffer and character graphics store includes a coded display buffer containing pointers to the store. The store is constituted by odd and even memories used to derive bit patterns for odd and even character cell columns on the display and is partitioned into a font area and a bit buffer area. In a first mode of operation, compatible with existing programmed symbol arrangements, pointers in the coded display buffer in conjunction with odd/even select signals and slice signals derive the bit patterns for each raster scan line of the display. In a second mode of operation, a graphic image to be displayed is stored as a bit map in the bit buffer area: the required bit pattern is derived using slice and odd/even select signals in conjunction with pointers stored in the coded display buffer.

公开(公告)号：DE3069324D1

公开(公告)日：1984-10-31

申请号：DE3069324

申请日：1980-12-19

Applicant: IBM

Inventor： BEAVEN PAUL ANTHONY

IPC: G06F17/30 ,  G06F15/40

Abstract: An interactive data retrieval apparatus in which a data base store is searched by content using search keys entered by an operator. Dedicated hardware includes a plurality of search modules and apparatus for clocking the byte-wide data stream read from the data store through successive search modules. In each module, the data is compared with an entered search key. When a match is found between the data stream and the search keys, the data record is displayed to the operator. The apparatus can detect near matches to allow for misspellings etc. In one embodiment of the search module, a plurality of comparison cells perform byte-equality operations on search key data stored in a search key register and the data stream. In a second embodiment, an associative store contains the n-character search key, the associative store being addressed by each character in the data stream as it is clocked past its data port. n shift registers are connected to the outputs of the associative store and are shifted in synchronism with the data stream.