I remember watching my friend play A10 Tank Killer on his Tandy 1000SX, it was almost unplayable, something like 1 frame per second. We used that Tandy 1000 SX

I remember watching my friend play A10 Tank Killer on his Tandy 1000SX, it was almost unplayable, something like 1 frame per second. We used that Tandy 1000 SX to measure the speed of a bullet, using a tight assembly loop written in DOS debug that polled the joystick fire buttons. One joystick fire button was hooked to a sound trigger next to the gun. The other button was hooked to a switch downrange on a target.