G - Physics – 06 – F
Patent
G - Physics
06
F
354/236.11
G06F 3/12 (2006.01) G06K 15/00 (2006.01)
Patent
CA 1286419
ABSTRACT OF THE DISCLOSURE A horizontal line processor for processing data for lines in a bit map memory contains a bit map of dots to be printed by a printer. The processor comprises a font memory for storing bit representations of characters to be printed and patterns for masking data to be stored in the bit map memory, and means for receiving instructions. Each instruction comprises a command specifying a type of operation to be performed on data to be stored in the bit map memory, the address of a selected line in said bit map memory in which the operation is to be performed, the starting address in the selected line, the starting address in the font memory of data to be retrieved therefrom in connection with the operation and the number of bits in the selected line on which the operation is to be performed. The processor also includes means responding to the instructions by commencing the operations specified therein at said starting address in the bit map memory and repeating the operation for said number of bits. The responding means include a register for the number of bits, the register being decremented each time said operation is performed by the number of bits involved therein, the decrementing of said register to zero indicating the completion of said command.
545279
Digital Equipment Corporation
Moffat & Co.
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