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US 4,068,225 AGranted
Apparatus for displaying new information on a cathode ray tube display and rolling over previously displayed lines
AssigneeHoneywell Information Systems Inc.
InventorErnest Paul Lee
Life of this patent
Estimating the term…
Abstract
A communications terminal having a video output wherein new data is displayed on the bottom line of the CRT and each line of previously displayed data is moved up one line. Logic internal to the terminal increments the address of the storage locations within a memory to accomplish this. The new data being displayed replaced the oldest data stored in the memory.
Claims26
A communications terminal having a video output which displays characters in locations defined by row and columnar positions, said terminal comprising:
- means for producing video row and column counts defining the location on the video output that is to display signals representative of a character;
- memory means having a plurality of addressable storage locations, for storing a number of rows of characters which are subsequently to be displayed;
- means for generating signals representative of a row feed count and a column feed count;
- means for generating a row input count indicative of where a new character is to be stored in said memory ;
- and
- addressing means coupled to said memory, said means for generating a row input count, and means for generating video row and column counts, for accessing locations within said memory during a display operation when a character stored in an addressable location is to be displayed, and during a storage operation when a character is to be stored in an addressable location, said addressing means comprising:
- input means for selectively gating the signals representative of said video row and row input counts during a display and a storage operation respectively;
- means for combining coupled to said input means, said row feed means with said memory means, said means combining said input row count with the row feed count during said storage operation so as to generate a resultant row address for storing in a last row of locations of said memory means the characters of a first row, and said means for combining including means for combining said video row count with the row feed count to generate a video row address for addressing said memory means for displaying said first row of characters along a bottom row of said video output;
- and
- means for incrementing coupled to said row feed counter means, said incrementing means being operative in response to a control signal to increment the row count by one and said incremented resultant video row address for addressing said memory means to display said first row of characters along a row next to said bottom row and during a storage operation for conditioning said memory to write a second row of characters into a first row of memory locations for display along said bottom row of video output thereby enabling storage and display of a number of most recently entered rows of characters.
7 more elements
Apparatus for displaying a number of rows of information, said apparatus comprising:
- a memory having a plurality of addressable storage locations;
- means for storing rows of characters in the addressable storage locations within said memory;
- means for maintaining a stored row count of the number of rows of characters which have been stored;
- means for maintaining a display row count indicative of a position within an ordered arrangement of display rows wherein a row of stored characters can be displayed;
- means for combining the display row count with the stored row count so as to define a combined row display count;
- means, responsive to said combined row display count, for accessing the stored contents of the addressable locations within memory;
- means for generating representations of the stored contents accessed from said addressable storage locations in such a manner that a first row of characters is displayed on a bottom row and previously displayed rows of characters are displayed adjusted upwardly one row;
- means for incrementing said stored row count, and means for combining the display row count with the incremented stored row count so as to define an incremented combined row display count;
- means responsive to said incremented combined row display count for accessing the stored contents of the addressable locations within memory;
- and
- means for generating representations of the stored contents accessed from said addressable storage locations in such a manner that a second row of characters is displayed on the bottom row, the first row of characters is displayed on a next to bottom row and the previously displayed rows of characters are displayed adjusted upwardly one row.
8 more elements
Dependencies are inferred from the claim text.