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HowTo: 128 chan derivative of Hill's 320 design w/ PCB and Linux driver  (Don Law)

Step 7 : Channel order on PCB

Here is another pic showing the pattern. My subcontrollers are A, B, C, D, E ... and I denote the 6 channels on A as A1, A2, A2, A4, A5, and A6, etc. The pattern repeats every 4 subcontrollers. 4 subcontrollers are served by 3 74LS374's, i.e. 3 x 8 (bits per chip) = 24, 4 x 6 (bits per subcontroller) = 24. You can see a bigger size of the above photo at http://home.comcast.net/~donlaw/lights/pcbnum.jpg