 The Saturn had technically impressive hardware at the time of its release , but its complexity made harnessing this power difficult for developers accustomed to conventional programming . The greatest disadvantage was that both CPUs shared the same bus and were unable to access system memory at the same time . Making full use of the 4 kB of cache memory in each CPU was critical to maintaining performance . For example , Virtua Fighter used one CPU for each character , while Nights used one CPU for 3D environments and the other for 2D objects . The Saturn 's Visual Display Processor 2 ( <unk> ) , which can generate and manipulate backgrounds , has also been cited as one of the system 's most important features . 
