						12 March 1984
						22 July 2008 update G. Johnson

To:	  T. Watts

From:	  M. Glass

Subject:  169 Module MDAT Receiver Support


     I am planning on supporting 169 modules very shortly.  I do not 
want to put them into the data base.  I am sending you this note in
the expectation that you are going to be responsible.

     169s seem to fit into the data base in a straightforward manner
with the following properties:
	
	Reading -- F(0) MDAT value
	Setting -- F(16) optional manual setting, F(0) read the setting.
	Basic status -- F(1) status
	Basic control -- F(9) reset, F(24) disable, F(26) enable.

     All properties are 1 word long.  The first three read/write a 
a single word without modification.  To perform basic control you send
a word to the front end containing:

	   1 -- disable
	   2 -- enable
	   3 -- reset
	   

			SSDNs
			-----

     All SSDNs are the same, to wit:

		+-------------------------------+
		|		0		|
		+-------------------------------+
		|	0	| OID = 1B (hex)|
		+-------------------------------+
		|     crate     |    slot	|
		+-------------------------------+
		|     1B (hex)  |        0	|
		+-------------------------------+
