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Format of DOS 4.00 (pre UR 25066) disk buffer info

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Offset Size Description

00h

DWORD

pointer to array of disk buffer hash chain heads (see #01654)

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 is in EMS (/X)
FFh = if buffers isn't in EMS

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???

See Also:

01649,#01650,#01653,#01657