-----------------------------------------------------------------------	                            MODIFICATION LEVEL SUMMARY

          Product Code         P/N                       Product Type SDI-D     
          Page 1 of 1          Date Issued 08/01/83      Revision D           
        =======================================================================	          Mod Level 1      Reference #              Date Released 07/30/80
        -----------------------------------------------------------------------	          Change: 1) Cut trace on component side between IC5-10 & IC5-16.
                  2) Jump IC5-10 to IC5-15.
                  3) Scrape off insulation of feedthrough hole near IC44 &
                     pins 9 & 10, located between IC44 & IC45, solder side.
                     Jump feedthrough to IC44-15.

          Reason: 1) Artwork layout errors.
                  2) Shorts +5V line to Ground.
                  3) Feedthrough hole should have been moved with the moving
                     of the trace between IC44-15 and IC56-19.
        -----------------------------------------------------------------------	          Mod Level 2      Reference #              Date Released 10/31/80
        -----------------------------------------------------------------------
          Change: 1) Jump IC13-4 to IC13-14 (F/F Preset).
                  2) Jumper on the solder side.

          Reason: 1) IC13-4 should be connected to +5V.
                  2) Artwork error.
        -----------------------------------------------------------------------	          Mod Level 3      Reference #              Date Released 06/30/82
        -----------------------------------------------------------------------
          Change: 1) Component side: At IC56, bend out pin 14 jump pin 4 to
                     pin 17.
                  2) Position 8 (bottom most) of switch #2 should be "on".

          Reason: 1-2) During the SDI's accessing of the 12K Host DMA the
                       64KZ-II requires a sMEMR signal which clocks for
                       each byte needed.  This mod ties the SDI's pSYNC
                       signal to sMEMR.