Main components

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Part NumberDescription
74HCT32
74HC244
74HC688
74HC04Hex Inverter
74HC27
74HC153
74HC193
74HC377
74HCT08
74HCT125
74HCT74Dual D Flip-flop, Set & Reset
74HC00
74HCT04
74HC32
74HC08Quad And2
74HC157Quad 2 to 1 line Multiplexer
74HC74Dual D Flip-flop, Set & Reset

B1 schematic

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B1 board layout