INT 21 - DIET v1.43e - GET TSR OPTIONS
        AX = 37D4h
        BX = 899Dh ('DI' + 'ET')
Return: AX = 0000h
        DX = TSR options (see below)
SeeAlso: AX=37D0h,AX=37D2h,AX=37D5h

Bitfields for TSR options:
 bit 0  automated compression of DIETed file
 bit 1  automated compression of newly-created file
 bit 2  suppress DIET message
 bit 3  display original file size
 bits 4-15 reserved (0)

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