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INT 31 - DPMI 0.9 API - protected mode - SET SEGMENT BASE ADDRESS
        AX = 0007h
        BX = selector
        CX:DX = linear base address
Return: CF set on error
        CF clear if successful
Notes:  only modify descriptors allocated with INT 31/AX=0000h
        only the low 24 bits of the address will be used by 16-bit DPMI
          implementations even on a 386 or higher
SeeAlso: AX=0006h,AX=0008h,AX=0009h,AX=000Ch