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