i've been collecting datasheets of isa/pci video chips recently, but some of them could not be found on the web, including:

any ati(18800, 28800, mach8, mach32, mach64), but ati probably tends not to make their chips' details public, even in the radeon era.
cirrus-video7 410/420
any headland/spea/video7(mostly 205, 208, 209, 216 etc.)
oak 067
any realtek(3102, 3103, 3105, 3106)
trident 8800, 8900b/c
most of s3(911, 924, 801, 805, 964, 864, 968, 868) except 928 being the only one that i have.
tseng et3000, et4000ax(there is an et4000 datasheet around but its probably an early version, never mentioned the name et4000ax, just et4000, and rated at 65mhz only)
any umc(mostly 405, 408, 418)

do you guys have any of them? it would be of great help, thanks a lot.
also it may be a good idea to make a collection of old computer component datasheets, just like vogonsdrivers.