8088 MPH: A Demoscene Demo on the 1981 IBM PC

HN points to it as the standard example of what cycle-exact, hardware-level programming can achieve on ancient machines, from the colors it produces to its PC speaker audio.

8088 MPH is a demoscene production for the original 1981 IBM PC with CGA graphics and a 4.77MHz 8088, shown with real composite output. It competed at Revision 2015 and pushes the hardware well past what it was thought capable of, breaking emulators.