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This PDF contains detailed information about 8255A PPI, 8254A PIT, 8259A PIC, 8237 DMA Controller and 8251A USART including Block Diagram, Control Words, Modes of Operation and Programming from each devices. It also contains procedures to Cascade PICs. This PDF was prepared from an Anonymous Application available on the web. The owner may consult padxu.com for any licensing issues.