A list of early CD-based videogame systems. This is pretty much everything I could think of off the top of my head. Here goes :
Apple Pippin: (Was actually developed after PS1, but figured it was obscure enough to be interesting)
AT&T 3DO: (Never Released)
Atari Jaguar CD:
Atari Jaguar Duo: (Combined Jag and CD player into 1 machine)
Bandai Playdia: (I think this was actually a kiddie version of some other system)
Commodore CD32:
Commodore CDTV:
FM Towns Marty:
JVC X'Eye: (Sega CD Clone)
Goldstar 3DO:
NEC PC Engine CD:
NEC PCFX:
NED PDE-LD1: (Clone of the Pioneer Laseractive)
NEC TurboDuo:
NEC TurboGrafx CD:
Nintendo's Mythical Super-Famicom CD:
Panasonic FZ-1 3DO:
Panasonic FZ-10 3DO: (Later Version)
Phillips CDI 210:
Phillips CDI 450:
Pioneer Laseractive:
A Laserdisc system with the possibility to play the following types of games, (most needed additional modules installed):
Sega Genesis cartridges
NEC TG16 HuCards
Sega CD CD-ROMs
NEC TG!6 Super CD-ROMs
Sega Mega LD-ROMs
NEC LD-ROM2s
...not to mention regular laserdisc movies, audio CDs, and CD+G titles
Samsung 3DO: (Never released, except maybe very briefly in Japan)
Sanyo 3DO:
Sega CD: (Early Model)
Sega CD: (Later Model)
Sega CDX: (Last Model)
SNK NeoGeo CD: