Peripheral circuitry for providing video I/O capabilities to a general purpose host computer

Claim 1

Peripheral circuitry for providing video I/O capabilities to a general purpose host computer, said general purpose host computer having a bus, data storage accessible for transfer of data to and from said storage over said bus, and a central processing unit, said bus being controllable by said central processing unit (CPU) or by an external device connected to said bus, the peripheral circuitry comprising: a video I/O port configured to connect to a video device; a bus interface circuit configured to connect to said bus of the host computer, said bus interface circuit including a bus master address generator that generates addresses of said storage for transfer of data to and from said storage over said bus, said bus interface circuit being capable of becoming bus master of said bus; a data buffer storing video data for transfer to or from said bus and for transfer to or from said video I/O port; and a processor connected to effect transfer of video data between said video I/O port and said data buffer and transfer between said data buffer and said storage of the host computer at addresses generated by said bus master address generator, said video data passing through said video I/O port in real time.