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The document discusses interfacing chips, specifically the 8255 Programmable Peripheral Input/Output Port and the 8254 Programmable Interval Timer. The 8255 Programmable Peripheral Input/Output Port can be programmed to have either three 8-bit I/O ports or two 8-bit and two 4-bit I/O ports. It has 24 I/O lines that can be individually programmed. The 8254 Programmable Interval Timer has an architecture that involves a control word. The document also discusses Direct Memory Access controllers and memor
- Author
- pop
- Language
- EN