I / O was provided by two MC6821 Peripheral Interface Adapters ( PIAs ).
2.
After this training year, he was assigned to the 6820 Peripheral Interface Adapter ( PIA ) development team.
3.
Bill Mensch did the 6502; he was the designer of the 6820 Peripheral Interface Adapter ( PIA ) at Motorola.
4.
The Peripheral Interface Adapter had a slight change in the electrical characteristics of the I / O pins so the MC6820 became the MC6821.
5.
This capability provides enhanced control over data transfer functions between the microprocessor and peripheral devices, as well as bidirectional data transfer between W65C21S Peripheral Interface Adapters in multiprocessor systems.
6.
The parallel port was connected through a memory-mapped Motorola MC6821 Peripheral Interface Adapter ( PIA ) which allowed the port to be fully bidirectional; the Osborne manuals also claimed the port implemented the IEEE-488 interface bus but this was rarely used.
7.
Other comparable I / O chips are the 2655 Programmable Peripheral Interface from the Signetics 2650 family of microprocessors, the Motorola 6820 PIA ( Peripheral Interface Adapter ) from the Motorola 6800 family, the Western Design Center WDC 65C21, an enhanced 6520, and many others.
8.
The March 7, 1974 issue of " Electronics " had a two-page story on the Motorola MC6800 microprocessor along with the MC6820 Peripheral Interface Adapter, the MC6850 communications interface adapter, the MCM6810 128 byte RAM and the MCM6830 1024 byte ROM . This was followed by an eight-page article in the April 18, 1974 issue written by the Motorola design team.
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