MOS Technology 6522

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The MOS Technology 6522  (P/N 156-1539-00) is a "Versatile Interface Adapter (VIA)" monolithic integrated circuit designed and manufactured by MOS Technology as an I/O port controller for the 6502 family of microprocessors.

The 6522 is similar to the Motorola 6820 with two timers and a shift register added.

It was second-sourced by a number of other companies.

Used in

Some instruments using part MOS Technology 6522

Instrument Manufacturer Class Model Description Introduced
FG5010 Tektronix Plug-in FG5010 20 MHz function generator 1982
Keithley 181 Keithley Multimeter 181 5½-digit nanovoltmeter (?)
Keithley 192 Keithley Multimeter 192 6½-digit multimeter 1979
Keithley 193A Keithley Multimeter 193A 6½-digit system multimeter 1985
Keithley 195 Keithley Multimeter 195 5½-digit TRMS digital multimeter (?)
Keithley 195A Keithley Multimeter 195A 5½-digit TRMS digital multimeter 1984
Keithley 196 Keithley Multimeter 196 6½-digit system multimeter 1986
Keithley 199 Keithley Multimeter 199 5½-digit multimeter (?)
Keithley 220 Keithley Power supply 220 Programmable current source (?)
Keithley 224 Keithley Power supply 224 Programmable current source (?)
Keithley 230 Keithley Power supply 230 Programmable voltage source (?)
MI5010 Tektronix Plug-in MI5010 multifunction interface 1982
SI5010 Tektronix Plug-in SI5010 GPIB-controllable 50 Ω BNC switch matrix 1982

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