Method and apparatus for address conversion in a chinese charact

Details Method and apparatus for address conversion in a chinese charact Method and apparatus for address conversion in a chinese charact

1988-08-22

1990-08-28

Oberley, Alvin

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340750, G09G 100

Patent

active

049529242

ABSTRACT:
In a CRTC scan circuit, a waste of memory space used in a character generator, such as a conventional Chinese character generator, during the scan can occur, thus an address conversion for a character generator is provided so that the memory space is completely utilized.
The procedure of address conversion is carried out by dividing the MASKROM memory space which is used in a character generator into two separate pluralities of partition groups according to a "character frame space" and an "actually used space" of a character, establishing an address mapping between those two partition groups, and determining an offset value between the input and output address data in this mapping. A general rule about the relation between these two partition groups is given and an address converter to perform the procedure is disclosed.

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patent: 4740784 (1988-04-01), Fick
patent: 4772883 (1988-09-01), Kitano

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