SNES Picture Processing Unit, “generates background character data, rotation, and scaling”: http://meseec.ce.rit.edu/551-projects/fall2014/3-1.pdf
Package
Nintendo
S-PPU1
5C77-01
3AF 59
Die
RICOH
G5C77(M)(C)
MZ @ 20x
Note: images are actually from two different chips. “s1” is the chip pictured above