Emulator PC outputing RGB to Sony PVM
Arcade VGA card, VGA to 5 BNC (R, G, B, Horizontal Sync, Vertical Sync) breakout cable and a BNC T-Connector to combine Horizontal and Vertical Sync on the cable. Connect it all to the 4 BNC inputs (R, G, B, Ext Sync) on PVM monitor
Arcade VGA
https://www.ultimarc.com/avgainf.html
VGA to 5 BNC cable example (buy it on eBay or Amazon)
https://www.google.com/search?client=firefox-b-1-d&ei=hJ58XbnRC9LH-gT5_5uADA&q=vga+to+5+bnc&oq=vga+to+5+bnc&gs_l=psy-ab.3..0l2j0i30l2j0i8i30j0i8i7i10i30.34717.35432..35847...0.0..0.110.191.1j1....1..0....1..gws-wiz.......0i67j0i7i30.WbVUtu5g0Tw&ved=0ahUKEwi5o5LO7M_kAhXSo54KHfn_BsAQ4dUDCAo&uact=5
BNC T-Connector example (buy it on eBay or Amazon)
https://www.google.com/search?q=bnc+t-connector&ie=utf-8&oe=utf-8#q=bnc+t-connector&start=10
Front-end software:
Maximus Arcade (defunct/no longer supported by creator)
Picture of back of PVM (What you care about is R-in, G-in, B-in, Ext Sync-in):
http://i80.fastpic.ru/big/2016/0512/d5/bc5be06471715bf826297ec2bdb56bd5.jpg