Display data transfer control apparatus applicable for display unit
November 7, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3868673 Variable size dot matrix character generator in which a height signal and an aspect ratio signal actuate the same Method for generating format lines and character data in an image scanning system Elimination of display blanks resulting from the use of character attribute codes in a videotex type system Terminal generation of dynamically redefinable character sets Direct memory access data transfer system for use with plural processors Patent #: 4481578 InventorsAssigneeApplicationNo. 06/928012 filed on 11/07/1986US Classes:345/467Character generatingExaminersPrimary: Caldwell, Sr., John W.Assistant: Fatahiyar, M. Attorney, Agent or FirmInternational ClassesG09G 5/393 (20060101)G09G 5/30 (20060101) G09G 5/36 (20060101) Foreign Application Priority Data1985-05-07 JPAbstractDisclosed is a display data transfer control apparatus in which a line control memory which can preset raster count data for modifying, in units of lines, an address of a main storage storing a character font to be displayed and character attribute data are provided, and a transfer line in the character font is determined for each line transfer in a DMA transfer sequence, so that, e.g., multi font control, character vertical elongation control, and ruled line vertical extension control, as well as processing character attributes such as an underline and overline, can be realized in the DMA transfer sequence. | |
