The Ping-Pong virus (also called "Bouncing Ball" or "Italian") was probably the most common and best known boot sector virus for a while, although the Stoned virus now outnumbers it.
Disinfection & Removal
An infected diskette will contain 1K in "bad clusters".
When this virus activates, a small "ball" starts bouncing around the screen, but in most cases no serious damage occurs.
There is one small bug in the virus code, which causes a crash on '286 machines (and also V20, '386 and '486). The reason is that the author used the "MOV CS,AX" instruction, which only exists on '88 and '86 processors.
This variant appeared in Israel. There the effect of the virus has been drastically changed. Instead of displaying a bouncing ball, the virus introduces typing errors in all text going out to the printer.