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pio 8255a block diagram and operation modes

Abstract: NMOS8255A PC2AC UM82C55A 80C86 keyboard controller 8048 um82
Text: UNICORN MICR OE LECT RO NICS 24E D • 127ô7ûê GQGQ13G 1 ;3 3 5^ #3 r - s a - s s - / * " - UM82C55A CMOS Programmable Peripheral Interface ■ Pin com patible w ith NMOS 82 55A ■ 24 programmable I/O pins ■ F u lly T T L com patible ■ Bus-hold c irc u itry on all I/O ports eliminates pull-up