DVCC experimental system used in parallel interface chip 8255A for the B input port, so that work in one way, will be connected to the PB0 ~ PB7 manually switch K1 ~ K8, the manual pulse signal SP population as 8255B Strobe, connect to PC2. B goods will work in one way at the time of interrupt request signals (PC0) to connect to the 8255A

8255A
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