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Int 0x21, AH=0xfd

21FD INT 21 - DOS v2.11-2.13 - OEM FUNCTION
21FD INT 21 - VIRUS - "Border" - INSTALLATION CHECK
21FD12BX3457 INT 21 - Gravis UltraSound - MegaEm/MEGA_EM - INSTALLATION CHECK
21FDAC INT 21 - VIRUS - "Delwin" - INSTALLATION CHECK

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