Write 8086 initialisation routine required to program 8255, Computer Engineering

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Write 8086 initialisation routine required to program 8255 for mode 1 with Port A and Port B as output Ports and Port C as an input port. Indicate all the relevant signals.

A, B can only change 1 byte at a time
C has individual bit set/reset capability
The Advantage is that non-dedicated circuit can change port configuration with software and no 'glue logic'.
Ports A, B, and C are used for I/O data.
Control register is programmed to select the operation mode of the three ports A, B, and C.
Mode0: simple I/O mode
Any of the ports A, B, CL and CU can be programmed as input or output.
No control of individual bits (all bits are out or all bits are in)

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