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Int 0x21, AH=0x58

2158 INT 21 - DOS 2.11+ - GET OR SET MEMORY ALLOCATION STRATEGY
2158 INT 21 - DOS 5+ - GET OR SET UMB LINK STATE
2158CC INT 21 - VIRUS - "1067"/"Headcrash" - INSTALLATION CHECK
2158DD INT 21 - VIRUS - "1067"/"Headcrash" - GET ORIGINAL INT 21h VECTOR

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