1. Diagrams

3. Bidirectional Buffer (74LS245)
Engr 4862 Microprocessors

4. Octal Latch

5. 8086 maximum & minimum modes
The mode is controlled by MN/MX.
Maximum mode is obtained by connecting MN/MX to low and minimum mode is by connecting it to high.
Having two different modes (minimum and maximum) is used only 8086.

7. Fig: Minimum Mode Read Cycle

8. Fig: Minimum Mode Write Cycle

9. Maximum mode
Maximum mode is designed to be used with a coprocessor exists in the system.
All the control signals (except RD) are not generated by the microprocessor.
But we still need those control signals.
Solution:
8288.

10. Fig: Maximum Mode Configuration of 8086

11. Fig: Maximum Mode Read Cycle

12. Fig: Maximum Mode Write Cycle