This part is a kind of semiconductor called RIVA128ZX.

Function of this product has 128-BIT 3D MULTIMEDIA ACCELERATOR.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

® RIVA 128ZX™ 128-BIT 3D MULTIMEDIA ACCELERATOR PRELIMINARY DATA KEY FEATURES • Fast 32-bit VGA/SVGA • High performance 128-bit 2D/GUI/DirectDraw Acceleration • Interactive, Photorealistic Direct3D Acceleration with advanced effects • Pinout backwards compatible with RIVA 128 • Massive 1.6Gbytes/s, 100MHz 128-bit wide 8MByte SGRAM framebuffer interface • Adds 16Mbit SDRAM support for cost sensitive 8MByte framebuffer applications • Video Acceleration for DirectDraw/DirectVideo, MPEG-1/2 and Indeo® - Planar 4:2:0 and packed 4:2:2 Color Space Conversion - X and Y smooth up and down scaling • 250MHz Palette-DAC supporting up to 1600x1200@85Hz • NTSC and PAL output with flicker-filter • Multi-function Video Port and serial interface BLOCK DIAGRAM • Bus mastering DM [ ... ]

RIVA128ZX PDF Datasheet Download