I picked up a couple VIC-20 "cores" that mean they are the main board with all the socketed ICs removed.
That includes the 6502 and 6522 chips.
I ordered from Mouser the 65C02N and the 6522N replacement ICs and have been told in my newbie post that they are issues with the 65C02S.
Also it appears ...

I have posted a picture of my test bed or hot mockup of a known working VIC-20 main board with only 65C02 and 65C22 populated.
It includes the other items I am using to support my "experiment."

It is a Dorktronic Expansion Port Breakout that will plug into a solder-less breadboard.
(http://www ...

I have 4 or 5 Vic-20 machines. My original from 1982 plus some others. All are working sans one, which is the short board with a pair of 6116 SRAM chips to replace most of the original 2114 memory chips used. It appears to have a bad 6560, which is also soldered in. The clock oscillator is running ...

I joined the forum as I am currently working on a project to set up an Arduino Mega for bus emulation with a 65C02 based system.
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The purpose of the Arduino Mega is to emulate ROM/RAM resources. There at least three other projects where the Mega is used as either a ROM/RAM emulator or as a ...

Welcome, energysteven :)

Briefly, to replace a vintage 6522 with a modern chip from WDC you want W65C22 N , not W65C22 S . The S version is updated (and arguably improved) by making the /IRQ pin a normal, totem-pole output, but for backward compatibility you want an Open Drain output as featured ...

I joined the forum as I am currently working on a project to set up an Arduino Mega for bus emulation with a 65C02 based system. What I have done is obtained two VIC-20 "cores"(working boards with out case, keyboard, etc.) and tested good but lack their socketed ICs - so I am populating them with ...