about 200 PC, 30 PS2, 10 PS1 and 20 Master System
That is, depending how you define "collection". Off the record, there might be some 10000 games for PC, Master System, Game Gear, Genesis/Megadrive, Sega CD/MegaCD, SG-1000, SC-3000, Intellivision, Colecovision, Odyssey 2, Apple II, Atari 2600/5200/7800, Atari Lynx, C64, Nes, SNes, N64, GB, GBA, DS, PS1, PSP, WonderSwan, Arcade machines...