| 摘要 |
PURPOSE:To develop character pattern data into a bit map at a high speed by eliminating the need for performing a process for character pattern development by a host CPU and also eliminating the overhead between an I/O bus and a display device. CONSTITUTION:A bit map display device is equipped with a bit map VRAM 5, a character pattern data CG 4, and an address generating means 14 for VRAM writing and the display controller is equipped with a function which can transfers the character pattern data from the CG to the VRAM not through an I/O bus 2 in synchronism with the timing signal from the host CPU 1. |
