A method is taught for providing a reference video signal to a video display through a video interface from a video display adapter for a host computer. The method includes the step of providing a horizontal sync line to carry a horizontal sync signal that occupies pre-defined time intervals as a representation of a horizontal sync pulse. Another step is signaling to the video display adapter that a reference amplitude pulse will be sent on a video data line. A further step is sending the reference amplitude pulse on a video data line during the pre-determined time intervals when the horizontal sync signal occupies the horizontal sync line.

 
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> Semiconductor wafer bearing alignment mark for use in aligning the wafer with exposure equipment, alignment system for producing alignment signals from the alignment mark, and method of determining the aligned state of a wafer from the alignment mark

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