At first I wanted to link to C64 productions such as this one https://www.youtube.com/watch?feature=player_detailpage&v=gG... but then I realized that the IBM PC was vastly worse designed than the C64. On the CPU, although running at whopping 4.77 MHz, trivial operations takes loads of cycles. The graphics memory sits on an ISA slot, 8-bit path and few MHz data-rate.

So, well done doing this on a machine that weak!