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Int 0x21, AH=0xfe

21FE INT 21 - DOS v2.11-2.13 - OEM FUNCTION
21FE INT 21 - DoubleDOS - GIVE AWAY TIME TO OTHER TASKS
21FE INT 21 - VIRUS - "483" - INSTALLATION CHECK
21FE01 INT 21 - VIRUS - "Flip" - INSTALLATION CHECK
21FE02 INT 21 - VIRUS - "2468"/"Tequila" - INSTALLATION CHECK
21FE03 INT 21 - VIRUS - "2468"/"Tequila" - DISPLAY VIRUS MESSAGE
21FEAD INT 21 - VIRUS - "Shifting Objective" - INSTALLATION CHECK
21FEDC INT 21 - PCMag PCMANAGE/DCOMPRES - INSTALLATION CHECK
21FEDC INT 21 - VIRUS - "Black Monday" - INSTALLATION CHECK
21FEFE INT 21 - VIRUS - "CIDER" - INSTALLATION CHECK

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