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
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 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 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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