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Autodocs
 Libraries:
 expansion.library
  AddBootNode
  AddConfigDev
  AddDosNode
  AllocConfigDev
  AllocExpansionMem
  ConfigBoard
  FindConfigDev
  FreeConfigDev
  FreeExpansionMem
  GetCurrentBinding
  MakeDosNode
  ObtainConfigBinding
  ReadExpansionByte
  ReadExpansionRom
  ReleaseConfigBinding
  RemConfigDev
  SetCurrentBinding
  WriteExpansionByte
Include
GuruMeditation
Docs » Autodocs » expansion.library » ReadExpansionByte

NAME

	ReadExpansionByte - read a byte nybble by nybble.

SYNOPSIS

	byte = ReadExpansionByte( board, offset )
	D0                        A0     D0

FUNCTION

	(Not typically called by user code)
 	ReadExpansionByte reads a byte from a new-style expansion
	board.  These boards have their readable data organized
	as a series of nybbles in memory.  This routine reads
	two nybbles and returns the byte value.
	In general, this routine will only be called by ReadExpansionRom.
	The offset is a byte offset, as if into a ExpansionRom structure.
	The actual memory address read will be four times larger.
	The macros EROFFSET and ECOFFSET are provided to help get
	these offsets from C.

INPUTS

	board - a pointer to the base of a new style expansion board.
	offset - a logical offset from the board base

RESULT

	byte - a byte of data from the expansion board.
   EXAMPLES
	byte = ReadExpansionByte( cd->BoardAddr, EROFFSET( er_Type ) );
	ints = ReadExpansionByte( cd->BoardAddr, ECOFFSET( ec_Interrupt ) );

SEE ALSO

WriteExpansionByte(), ReadExpansionRom()

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