This is a stealth boot sector virus. Unlike most other boot sector viruses, RP does not decrease the total amount of DOS memory; instead it decreases the amount of free memory.
Disinfection & Removal
RP activates on the 17th of December. When the machine is booted on that date, the virus decrypts a message, switches the display to 40 column mode and displays the following text:
RP wants to say hello!
After this, the virus overwrites part of the hard drive, making the machine unbootable.
The virus is buggy and often crashes when infecting a floppy. RP was reported to be in the wild in Hungary and Denmark in January 1996.
Description Created: Mikko Hypponen, F-Secure