| 摘要 |
A control apparatus for a raster scan printer has a bit map memory for storing bit information corresponding to print dots, input means for writing the bit information into the bit map memory, sending means for reading the bit information from the bit map memory and sending it to the raster scan printer, and a central processing unit for controlling the apparatus. The address of the bit map memory ascends in a sheet feed direction and is consecutive in a raster scan direction. A control method includes the steps of storing bit information corresponding to print dots in a bit map memory sequentially in a sheet feed direction and consecutively in a raster scan direction, reading the bit information from the bit map memory in the raster scan direction and sending it to the raster scan printer, storing bit information corresponding to print dots into an area of the bit map memory from which the bit information has been read, and reading the latter bit information and sending it to the raster scan printer. The bit map memory is allotted to the print dots in a multiple manner to form a ring buffer system. In a software implementation, the writing and reading can be carried out without paying attention to a ring boundary. In a hardware implementation, no multiplier nor residue circuit is necessary and the configuration is simplified.
|
