-offtopic again-
i just double checked before i tell something wrong here
xga introduced 16bit colour mode for 640x480,
but more important was the introduction of 1024x768x256 (interlaced at that time)
the introduction of 24 and 32bit capable dac's was indeed separated from 3d accelerators, but they came to live nearly at the same time, emerging around 93/94, some really high end graphic cards (speak, more expensive than your average pc at that time) having it already some time earlier.
And believe me, except for a still image you couldn't really do a lot with 24/32bit modes without those accelerators ...
nuff of pc graphic history, lets play ssf now
k: