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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