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Format of MBBIOS PACCOM buffer

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Offset Size Description

00h

504 BYTEs

data area

1F8h

WORD

length of data in data area

1FAh

BYTE

flags/status
bit 7 : don't discard buffer after transmitting data
bit 6 : buffer has been transmitted

1FBh

BYTE

reserved (0) for additional flags/status

1FCh

WORD

user data

1FEh

WORD

MBBIOS-internal pointer to next buffer