=> R0 = 3 (reason code)
R1 = internal buffer ID
R2 = pointer to destination
R3 = number of bytes to remove
R12 = value returned by Buffer_InternalInfo
<= R2 = pointer to first free byte in destination
R3 = number of bytes not removed
C set if unable to transfer all data (R3 <> 0)
This removes a block of data from a buffer.
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