S3 TPU unit by Dietmar Meschede /code/hardware/video/s3unit3.zip	10 Jan 1997 (catalog date) 16,549 bytes
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Source to set 320x240x256 and 640x480x256 modes with 1MB addressing on S3 chips - Doesn't directly say how to access that video memory or what to do with it. Now adays one should simply use the VESA BIOS.