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Int 0x2F, AH=0xdf

2FDF00 INT 2F - HyperWare programs - INSTALLATION CHECK
2FDF00BX5445 INT 2F U - Quarterdeck TELTSR.COM - INSTALLATION CHECK
2FDF01BX0000 INT 2F U - MSG.COM - INSTALLATION CHECK
2FDF01BX4448 INT 2F - HyperDisk v4.50+ - GET CURRENT CACHE STATE
2FDF01 INT 2F U - Quarterdeck TELTSR.COM - CLOSE CONNECTION
2FDF02BX4448 INT 2F - HyperDisk v4.50+ - SET CACHE STATE
2FDF02 INT 2F U - Quarterdeck TELTSR.COM - OPEN CONNECTION

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