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

          Product Code         P/N                       Product Type SCC       
          Page 1 of 1          Date Issued 08/01/83      Revision D, D1       
        =======================================================================	          Mod Level 1      Reference #              Date Released 05/02/80
        -----------------------------------------------------------------------	          Change: 1) Change IC32 from 74LS74 to 7474.

          Reason: 1) To provide increased drive capability to the 0 signal
                     into the Z80.
        -----------------------------------------------------------------------	          Mod Level 2      Reference #              Date Released 08/07/80
        -----------------------------------------------------------------------
          Change: 1) Replace metal screws & washers with nylon screws &
                     washers at the locations indicated: IC17-7905C.

          Reason: 1) This regulator's heatsink is electrically hot.  Nylon
                     hardware will alert users to this effect.
        -----------------------------------------------------------------------	          Mod Level 3      Reference #              Date Released 07/20/81
        -----------------------------------------------------------------------
          Change: 1) IC31, a 74LS04, should be TI only - P/N 010-0066-1.

          Reason: 1) TI parts required for proper operation of the oscillator
                     circuit.
        -----------------------------------------------------------------------	          Mod Level 4      Reference #              Date Released 02/18/81
        -----------------------------------------------------------------------
          Change: 1) Remove IC18 pins 1, 2, 3, 4 & IC24 pins 2 & 12 from
                     socket.
                  2) Jump IC18 chip pin 3 to IC24-2 solder side (via feed-thru
                     hole for faultfinder).
                  3) Jump IC18 chip pin 1 to IC24-12 solder side.
                  4) Jump IC18 chip pin 4 to IC24 chip pin 2.
                  5) Jump IC18 chip pin 2 to IC24 chip pin 12.

          Reason: 1) This change puts the base address of the SCC ports to
                     50 hex so that port 53 & 54 can be used to drive a
                     Centronics printer.