NAME   rev ADDR type chip Description
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SERDAT  030  W      P   Serial port data and stop bits write.

	This address writes data to a transmit data buffer.
	Data from this buffer is moved into a serial shift register
	for output transmission whenever it is empty.This sets the
	interrupt request TBE  (transmit buffer empty). A stop bit
	must be provided as part of the data word. The length
	of the data word is set by the position of the stop bit.


  BIT#  15  14  13  12  11  10  09  08     07  06  05  04  03  02  01  00
  USE    0   0   0   0   0   0   S  D8     D7  D6  D5  D4  D3  D2  D1  D0

	Note :  S= Stop bit =1, D= data bits