A807:
IC14 40-87  1.727.351.22.BIN            These next 2 are A807 Mk1 from 1987
IC15 40-87  1.727.351.22.BIN

            A807_3088_IC14-10-89.BIN    And these next 2 are A807 Mk1 from 1989
            A807_3088_IC15-10-89.BIN
            A807MKII_IC14_20-92_1.727.651.26.BIN  This is A807 MK2 

            
            
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A820:
MPU Master firmware 1.820.986.22    device eprom = intel D27513 (20/89)
                                    or hitachi hn27128ag-25