Still picture display apparatus and external memory...

Details Still picture display apparatus and external memory... Still picture display apparatus and external memory...

G - Physics

09

G

G09G 5/22 (2006.01) G06F 3/153 (2006.01) G09G 5/02 (2006.01)

Patent

CA 2050279

A still picture display apparatus comprises a VRAM and a character ROM. The VRAM is allocated first coordinate addresses corresponding to display positions of a laster scan type display, and a character code representing a character to be displayed is stored in each of the first coordinate addresses. The character ROM is divided into a plurality of storage areas, and dot data of the character is stored in an address designated by the above character code in each of the storage areas. An extended RAM is also allocated second coordinate addresses similarly to the VRAM, and modifying data (character modifying data and/or color modifying data) corresponding to the character code stored in the VRAM is stored in each of the second coordinate addresses. The modifying data is read out of the extended RAM and is loaded into a register and then, is applied as a higher order address of the character ROM to designate any one of the storage areas, and the character code read out of the VRAM is applied as a lower order address of the character ROM. Consequently, the dot data of the character corresponding to the character code is read out of the character ROM.

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