Damn, you had the buy the interface unit and the CD-ROM separately?
Also, isn't everything pre-version 3.0 just using 64k of RAM and not 128k? System 3.0 seems like a giant leap over the earlier games that used 2.0. Maybe the extra 64K being counted in this equation is from the dedicated ADPCM chip RAM? I know Monster Lair used that as program RAM, damned if I can tell, though... it still seems simple even by System 2.0 standards.