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Everything you need: schematic, circuit explanation, operating/testing instructions. Awesome.
Text excerpt from page 41 (click to view)
Digital Main 7/8 Schematic Diagram
1 NOTE: 1. The order of pins shown in this diagram is different from that of actual IC1504. 2. IC1504 is divided into four and shown as IC1504 (1/4) ~ IC1504 (4/4) in this Digital Main Schematic Diagram Section.