Motorola 6821

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The Motorola 6821  (P/N 156-0427-03,156-1205-00) is a "Peripheral Interface Adapter (PIA)" monolithic integrated circuit is an I/O port controller for the Motorola 6800 family of microprocessors.

It is an updated version of the Motorola 6820 with slightly different specs.

It was second-sourced by several other companies. The 68B21 (156-1205-00) is a 2 MHz version.

Used in

Some instruments using part Motorola 6821

Instrument Manufacturer Class Model Description Introduced
067-1137-99 Tektronix Plug-in 067-1137-99 GPIB-to-accessory controller 1984
7A16P Tektronix Plug-in 7A16P 150/200 MHz vertical amplifier 1978
7A29P Tektronix Plug-in 7A29P 1 GHz programmable amplifier 1988
7B90P Tektronix Plug-in 7B90P 400 MHz programmable timebase 1978

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