| 摘要 |
PURPOSE:To obtain the titled system, by which the font data reading out speed can be made high, by selecting and reading the font data corresponding to raster that is presently scanned out of a front buffer memory or a register. CONSTITUTION:The font data in a font memory 6 is divided into blocks each including four rasters. An address is assigned to each block at an interval of every four addresses. Address information for the font memory 6 is obtained by an address operating circuit 15. Address information for a font buffer memory 3 is prepared by an address operating circuit 16. Without waiting the reading of an overlapping/thinning memory 3, the font data for four lines are read from the font memory 6 as a block for the memory (or register) 17. Then the font data for one raster required for the present raster is selected and outputted from the memory (or register) 17 based on the overlapping/thinning information. |
