Description: It is written in assembly language implementation of a programmable parallel interface experiments, (1) A set 8255A' s work in the way of an output port. (2) a single pulse each time the button produces a positive pulse to generate an interrupt request 8255A. (3) Design interrupt service routine, followed by the output 01H, 02H, 04H, 08H, 10H, 20H, 40H, 80H, so that a light L0 ~ L7.
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8255-1_1.asm
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