|Type||Boot sector virus|
|Place of Origin|
|Infection Length||1 boot sector|
Mad is the second known virus ever created for the Atari ST computer. It is a boot sector virus, sometimes also called the Fun virus or Emil 2A.
When a disk infected with Mad is booted, the virus becomes memory resident. It copies itself to drives A: or B: whenever they are read or written to. After five infections, the virus makes changes to the contents of the screen and causes the computer to beep.
Richard Karsmakers. THE KNOWN VIRUSES ON ATARI TOS COMPUTERS AND THEIR SYMPTOMS.
Hallvard Tangeraas. Common viri (sic) on the Atari ST. 1996.02.15