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                            MODIFICATION LEVEL SUMMARY

          Product Code         P/N 520-0162              Product Type SDMA    

          Page 1 of 1          Date Issued 4/24/85       Revision B           
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          Mod Level 1      Reference # 3.054        Date Released 03/01/85
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	  Change: 1) On solder side, cut trace going to SW2 pin 7.
		  2) On solder side, jumper SW2 pin 7 to IC13 pin 9.

	  Reason: 1-2) Artwork errors.

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	  Mod Level 2	   Reference # 3.522	    Date Released 10/31/85
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	  Change: 1) Add 16 pin header and 2 pin shorting jumper to bill of
		     materials.  16 pin header soldered at location "control
		     port address" next to IC 59.
	  Reason: 1) Ease of  port address section for user.