Joe shows off his small arcade PCB collection in this episode. He compares sound at one point (about 5:12) between his board and MAME with MAME sounding inferior. I believe his is a 16B board and he compared it to the parent 16A set. I came by this conclusion by testing a few sets and noticing that 16B sounds more like his and uses an NEC chip instead of 16A's 8-bit R-2R DAC.
The games he shows are Shinobi, The Astyanax, Premier Soccer, Party Time: Gonta the Diver 2, Rastan, Gun Force 2, Metal Slug 5, Ghouls 'n Ghosts, Choplifter, Golden Axe: The Revenge of Death Adder, and X-Men vs Street Fighter