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Sunday 18 February 2018 at 13:17
The 65C22 VIA's from Western Digital Centre won't work in system 3 boards. Here is a link with legit NOS VIA's:
https://www.ebay.nl/itm/CMD-G65SC22P-2-8812-NEW/162666770043?hash=item25dfb1ee7b:g:oOEAAOSwImRYkwHD
Source: http://pinside.com/pinball/forum/topic/gottlieb-system-3-mpu-cpu-amp-via-chip-replacements#post-4236549