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Format of DOS 4.00 (pre UR 25066) disk buffer info:
Offset  Size    Description
 00h    DWORD   pointer to array of disk buffer hash chain heads (see below)
 04h    WORD    number of disk buffer hash chains (referred to as NDBCH below)
 06h    DWORD   pointer to lookahead buffer, zero if not present
 0Ah    WORD    number of lookahead sectors, else zero (the y in BUFFERS=x,y)
 0Ch    BYTE    00h if buffers in EMS (/X), FFh if not
 0Dh    WORD    EMS handle for buffers, zero if not in EMS
 0Fh    WORD    EMS physical page number used for buffers (usually 255)
 11h    WORD    ??? seems always to be 0001h
 13h    WORD    segment of EMS physical page frame
 15h    WORD    ??? seems always to be zero
 17h  4 WORDs   EMS partial page mapping information???