The four stages of working out a Quantel Paintbox card's functionality: 1) What is this part? 2) What does this part do? 3) How does this part do that? 4) Why does this part do that?
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Practical examples: 1) The BIT CLK input on the Filter Card. 2) Provides an 8MHz reference clock. 3) An 8MHz resonator most likely. 4) One cycle equals one bit duration coming off the disk. 1) CB, a '163 counter. 2) Drives timing and is preloaded to 2. 3) BIT CLK 4) <- I'm here
