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- KO7I nRST Qi | KO7O Qi+1
- -------------+----------
- X L X | L A after reset, lock KEYOUT7 low (1)
- H H A | L A stay locked while KO7I is high
- L H A | L B KO7O tracks KO7I after first L on KO7I (2)
- L H B | L B (3)
- H H B | Z B note that KO7O is open collector/tri-state (4)
- (1) possibly equivalent alternatives:
- X H->L X | L A
- X L->H X | L A
- (2) equivalent alternative:
- H->L H A | L B
- (3) equivalent alternative:
- H->L H B | L B
- (4) equivalent alternative:
- L->H H B | Z B
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