8255 PPI Study Card 8255 PPI Study Card This study card for 8255 is designed to explain all the features of 8255 peripherals. Additionally, the board also features Four 8-way dip switches to configure the 8255 Port lines in different modes of operation. 8 RED, 8 GREEN, and 5 YELLOW LEDs are provided to read the status of port A, port B and port C lines respectively. Switches S1, S2 & S3 are provided to stimulate STB* or ACK* signals in Mode 1 and Mode 2.
