FOr a 286,I imagine "multimedia" meant "more than 4 colours" 
Actually, even well before the '286 there was a rather neat piece of kit that IBM created called the IBM Graphics System. It consisted of two ISA (8-bit!) cards, each driven by an 8086 on the card, capable of millions of colors and some effects that wouldn't be seen again until ... well, the Amiga!
It was prohibitively expensive (imagine, you've bought an XT already, and now you turn around and have to buy essentially two
more) and required a separate (and expensive) display.
But some of the real-time graphic effects you could get out of it were, for the time, amazing.
here are the specs on the card.