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8255, Programmable Peripheral Interface
82C55A CMOS Programmable Peripheral Interface by Harris Semiconductor (1998-06)
8255A, 82C55A Device Description by Intel (2002)
8255A, 8255A-5 Programmable Peripheral Interface (1991-08)
8255A∕8255A-5 Programmable Peripheral Interface
Intel 8255 by Wikipedia (2017-11-14)
Intel i8255 PIO Programming Tutorial - Extracts by Richard Steven Walz (1995)
