U2
Sega 315-5883 (Hitachi HD64440)
GPU
Sprite/polygon processor
About this component
VDP1 draws sprites, distorted sprites and textured quadrilaterals (the Saturn's 'polygons') into one of two 256 KB frame buffers while the other is displayed, using 512 KB of its own command/texture RAM. VDP2 then composites that frame buffer with its background layers. Graphics corruption limited to sprites and 3D objects, with backgrounds intact, points towards VDP1 or its RAM. Part variants: Earliest boards use 315-5689; later small boards and the single-board VA7 use 315-5883.
What it does on this board
Handles sprites and textured polygons.
Pinout & readings
No pinout or reference readings yet — these show what each pin does and what a healthy part should measure.