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The “AB” in this picture is really just the pertinent control code that tells if H is changing, if V or F is changing and there are some checksum bits in there for error correction as well. If we’re at the start of a line, you’ll see a long sequence of horizontal blanking, which is denoted by the “80 10 80 10” sequence. Then there’s another preamble code that tells the system that H=0, the SAV (the start of active video) is coming. Then there will be the whole video line, the 720 active pixels which equates to 1440 bytes. And then we’re off to the start of the next line with a new end of active video sequence.
PTM Published on: 2006-08-24
