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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