Method and apparatus for clearing the memory of a video computer
First Claim
1. A method of initializing a video-type system or the like having processor means, memory means, and a video display, said memory means having a plurality of memory cells arranged in rows and columns and having serial register means coupled to said columns, comprising:
- deriving a plurality of predetermined data signals in said processor means, storing said derived signals serially in said serial register means in a predetermined sequence,selecting one of said rows of memory cells in said memory means, andtransferring each of said stored data signals from said serial register means to corresponding ones of said cells in said selected row.
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Abstract
In a video computer system and the like having a bit-mapped RAM component including a shift register, an improved method is provided for rapidly clearing the RAM in order to prepare the system to receive new input data. More particularly, a preselected number of predetermined data bits corresponding to the number of columns in the RAM is serially shifted into the register. Thereafter, the contents of the shift register are progressively shifted into each of the rows in the RAM until all rows are filled.
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Citations
21 Claims
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1. A method of initializing a video-type system or the like having processor means, memory means, and a video display, said memory means having a plurality of memory cells arranged in rows and columns and having serial register means coupled to said columns, comprising:
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deriving a plurality of predetermined data signals in said processor means, storing said derived signals serially in said serial register means in a predetermined sequence, selecting one of said rows of memory cells in said memory means, and transferring each of said stored data signals from said serial register means to corresponding ones of said cells in said selected row. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of initializing a computer system having processor means, semiconductor memory means, and a video display, said memory means having a plurality of memory cells arranged in rows and columns interconnectable in parallel with serial register means comprising
deriving a plurality of predetermined data signals in said processor means corresponding in number to said plurality of solumns of memory cells of the memory means, storing said derived data signals in said register means, selecting one of said rows of memory cells, and transferring said data signals from said register means to said corresponding cells in said selected row.
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19. A method of creating and updating video display means in a system having processor means, video display means, semiconductor and memory means holding bit-mapped data for said display means, comprising:
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writing a predetermined sequence of N data bits into a memory array in said memory means having M rows and N columns of read and write memory cells, by the steps of shifting said sequence of N data bits serially into register means, and thereafter addressing said M rows in succession and writing said N data bits in parallel into each of said M rows in succession.
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20. A method of initializing a bit-mapped memory of a computer-controlled video display system or the like, comprising:
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deriving a plurality of predetermined data signals, serially storing said derived signals in register means of the memory, selecting a portion of said memory, and thereafter transferring said serially stored signals from said register means into said selected portion of said memory in parallel. - View Dependent Claims (21)
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Specification