INT 21 - VIRUS - "Sunday", "Tumen 0.5", "Hero" - INSTALLATION CHECK
AH = FFh
Return: AH = 00h if "Tumen 0.5" or "Hero" resident
AX = 0400h if "Sunday" resident
SeeAlso: AX=FF0Fh

See also: 21FEDC

21FF - VIRUS - "Sunday", "Tumen 0.5", "Hero" - INSTALLATION CHECK