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Mr G, could you please :
1) Remove the link between flapopen and flap. (flapopen is just a state, not an interrupt)
2) Add <--- 1 — between int and sta columns.
3) Add an arrow from sta to z80 with a IN A,(STA) in Z80
4) Bold the /INT REQ and its arrow
5) Enlarge the event and add : Event (5 ms tick, second, minute, serial port byte received, battery low ...)
6) Add a /NMI box with a pulse symbol (if you want...) with power failure, card insertion → /SNS -→ /NMI