Pixel protection mechanism for mixed graphics/video display adaptors

摘要: A locking mechanism is incorporated in a high-resolution video display system including monitor, computer for providing controls signals to said and two frame buffers, one storing generated graphics images data both of buffers being operable under control reading out the monitor. The includes an output lock functionally located between monitor preventing from overwriting on screen. An input also provided static stored predetermined regions buffer continually overwritten by motion supplied buffer. utilizes extra bit-plane which stores pattern normal port operating standard addressing circuitry combination with straight-forward combinational logic achieve function. small DRAM this conjunction write operations disable function