Peripheral Interface Adapter

A Peripheral Interface Adapter (PIA) is a peripheral integrated circuit providing parallel I/O interfacing for microprocessor systems.

PIA pin configuration

<span style="color:
#626971;">    ┌─────⊔︀─────┐
Vss ┤ 1       40├ CA1
PA0 ┤ 2       39├ CA2
PA1 ┤ 3       38├ !IRQA
PA2 ┤ 4       37├ !IRQB
PA3 ┤ 5       36├ RS0
PA4 ┤ 6       35├ RS1
PA5 ┤ 7       34├ !RES
PA6 ┤ 8       33├ D0
PA7 ┤ 9       32├ D1
PB0 ┤10       31├ D2
PB1 ┤11       30├ D3
PB2 ┤12       29├ D4
PB3 ┤13       28├ D5
PB4 ┤14       27├ D6
PB5 ┤15       26├ D7
PB6 ┤16       25├ E
PB7 ┤17       24├ CS1
CB1 ┤18       23├ !CS2
CB2 ┤19       22├ CS0
Vcc ┤20       21├ R/!W
    └───────────┘</span>

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