Engineering / Digital circuit diagnosis
Signal & memory
Repair a controller that shares resources, remembers requests, and recovers from faults.
One energy token powers three stations. B is urgent; C must remember a request made while B is busy. After an emergency, recovery is safe only when every station is empty.
Energy controller
A holds the single energy token.
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Repair three controller rules
The nine-frame test sends competing requests, releases their buttons, returns a token, trips the controller, attempts recovery, flushes, and resets.
Make a change, explore the result, then check your solution.
Need a hint?
Give B priority, remember the waiting request, and allow recovery only with empty stations. Watch clock steps 2, 4, and 6.