Motorola 6821

The Motorola 6821  (P/N 156-0427-03,156-1205-00) is a Peripheral Interface Adapter (PIA) monolithic integrated circuit, 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, e.g. as the Hitachi HD6321. The 68B21 (156-1205-00) is a 2 MHz version.

Used in

Some instruments using part Motorola 6821

Instrument	Manufacturer	Class	Description	Introduced
067-1137-99	Tektronix	Plug-in	GPIB-to-accessory controller	1984
4041	Tektronix	Computer	BASIC-programmable computer	1982
4052	Tektronix	Computer	Graphics-capable desktop microcomputer	1978
4052A	Tektronix	Computer	Graphics-capable desktop microcomputer	1983
4054	Tektronix	Computer	Graphics-capable desktop microcomputer	1978
4054A	Tektronix	Computer	Graphics-capable desktop microcomputer	1983
4662	Tektronix	Printer	Interactive digital plotter	1976
4692	Tektronix	Printer	Color Copier	1984
50M10	Tektronix	Plug-in	A/D Converter	1984
50M20	Tektronix	Plug-in	12-bit D/A Converter	1983
50M30	Tektronix	Plug-in	16-bit I/O card	1982
50M40	Tektronix	Plug-in	Relay Scanner Card	1982
50M70	Tektronix	Plug-in	Development Card	1982
7250	Tektronix	Oscilloscope	6 GHz Transient Digitizer	1986
7A16P	Tektronix	Plug-in	150/200 MHz vertical amplifier	1978
7A29P	Tektronix	Plug-in	1 GHz programmable amplifier	1988
7B90P	Tektronix	Plug-in	400 MHz programmable timebase	1978
CG5001	Tektronix	Plug-in	programmable calibration generator	1983
CG5010	Tektronix	Plug-in	programmable calibration generator	1990
CG5011	Tektronix	Plug-in	programmable calibration generator	1990
CG551AP	Tektronix	Plug-in	programmable calibration generator	1980
Keithley 175	Keithley	Multimeter	4½-digit TRMS digital multimeter	1983
Keithley 191	Keithley	Multimeter	5½-digit multimeter	1979

Links

• Peripheral Interface Adapter @ Wikipedia

Pictures

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