PS2''s Emotion Engine core is based on the MIPS family of CPUs, you''ll find documentation, source code etc at: http://www.mips.com

GBA''s CPU is one of the ARM family of CPUs, once again you''ll find info etc at: http://www.arm.com


PS2 also has the vector processing units where code looks like:

mulq.xyzw BLAH4,BLAH4,q             nop madd.xyz BLAH3,Blah_Blah0,BLAH3     sq.xyzw BLAH1,0x02(BLAHADDR)             mulx.xyz BLAH2,BLAHZ,BLAH           sq.xyzw BLAH2,0x05(BLAHADDR)muly.xyz BLAH1,BLAHY,BLAH           sq.xyzw BLAH2,0x0B(BLAHADDR)clipw.xyz BLAH4,vf0                 lqi.xyzw BLAH_X,(BLAHADDR++) 

BLAHs are defined variables/registers/memory locations (the names have been changed to protect the...). And yep, the VU assembler does have 2 columns.