1. AD0-AD:- Address/Data bus multiplexed
2. RESET:- RESET input
3. CE bar:- chip enable
4. ALE:- Arithmetic latch enable
5. RD-bar:- Read input
6. WR-bar:- Write input
7. IO/M-bar:- I/O or memory
8. PA0-PA7:- Port A
9. PB0-PB7:- Port B
10. PC0-PC7:- Port C
11. TIMER-IN: Timer input signal
12. TIMER-OUT-bar: Timer output
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