There is a combination of about 8253, 8255, 8259, you look great god help.
Topic as shown above, the main is don't know, since he gave port address, what should the line from the 8086 connection 74 ls138 even, and the interrupt service subroutine should be how to write, is directly write 8255 a
The control of the port a c program, or from the beginning of the 8255 a initialization, you great god help
