It is not a dangerous memory resident parasitic virus. It hooks INT 9, 21h and writes itself to the end of EXE files that are executed. Depending on its internal counter the virus drops the letter on the screen and displays the message:
Remember about XT in world of PC
The virus also contains the text string:
AlphaVirus  Copyright (C)1995 AlphaSoft(Russia,St.Petersburg,ASCh,12/20/95
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Virus.DOS.ASCh.794 or ASCh is a memory resident parasitic virus that runs on MS-DOS. When the...