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    AST RESEARCH, INC.           TECHNICAL BULLETIN # 1009                 11-7-94

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                 ADVANTAGE! MT AND BRAVO MS, L AND T P60/90 BOOT FAILURE

    PROBLEM:        Some Advantage! and Bravo P60/90 systems report a "A20 Gate
                    Failure" error message on the screen at boot and the system
                    hangs.

    CAUSE:          Incorrect resistors used on the system board.

    SYSTEMS
    AFFECTED:           AST
                    PART NUMBER     DESCRIPTION

                    501530-XXX      MANG 5-60
                    501533-XXX      BMS P-60
                    501534-XXX      BMS P-90
                    501543-XXX      ADV RMS P-60
                    501544-XXX      ADV RMS P-90
                    501545-XXX      ADV RMT P-60
                    501546-XXX      ADV RMT P-90
                    501577-XXX      PRM MX P-60
                    501613-XXX      BMS P-90
                    501650-XXX      BMS-L P-60
                    501651-XXX      BMS-L P-90
                    501659-XXX      BMS T P-60
                    501660-XXX      BMS T P-90
                    501679-XXX      BMS P-60
                    501680-XXX      BMS P-90

    SOLUTION:       This is an informational bulletin only.  If the system
                    experiences an A20 Gate Failure error and hangs at boot,
                    upgrade your system board.  See part numbers below.

    PARTS
    REQUIRED:           AST                                             REVISION
                    PART NUMBER           DESCRIPTION                     LEVEL

                    202653-001   PCBA MBD P60 8MB/1MB 256K CACHE      X08 or higher
                    202653-002   PCBA MBD P60 16MB/2MB 256K CACHE     X07 or higher
                    202653-003   PCBA MBD P60 8MB/0VDO 256K CACHE     X05 or higher
                    202653-004   PCBA MBD P60 16MB/0VDO 256K CACHE    X05 or higher
                    202653-011   PCBA MBD ARMS P60 8MB/1MB 256K       X03 or higher
                    202653-012   PCBA MBD ARMS P60 16MB/1MB 256K      X03 or higher
                    202653-021   PCBA MBD BMS-T P60 8MB/1MB 256K      X03 or higher
                    202653-022   PCBA MBD BMS-T P60 16MB/1MB 256K     X03 or higher
                    202653-031   PCBA MBD BMS P60 8MB/1MB 256K        X03 or higher
                    202653-032   PCBA MBD BMS P60 16MB/1MB 256K       X03 or higher
                    202653-041   PCBA MBD BMS-L P60 8MB/1MB 256K      X03 or higher
                    202653-042   PCBA MBD BMS-L P60 16MB/1MB 256K     X03 or higher
                    202653-051   PCBA MBD PRMMX P60 8MB/0MB 256K      X03 or higher
                    202653-052   PCBA MBD PRMMX P60 16MB/0MB 256K     X03 or higher
                    202653-061   PCBA MBD ARMT P60 8MB/1MB 256K       X03 or higher
                    202653-062   PCBA MBD ARMT P60 16MB/1MB 256K      X03 or higher
                    202653-101   PCBA MBD ASYNCH 0MB/1MB 256KCRTLRSMT X06 or higher
                    202653-103   PCBA MBD ASYNCH 0MB/0MB 256KC THDR   X03 or higher
                    202653-131   PCBA MBD BMS P5A 0MB/1MB 256K        X03 or higher
                    202653-141   PCBA MBD BMS-L P5A 0MB/1MB 256K      X03 or higher
                    202653-151   PCBA MBD PRMMX P5A 0MB/1MB 256K      X03 or higher
                    202653-161   PCBA MBD ARMT P5A 0MB/1MB 256K       X03 or higher
                    202653-601   PCBA MBD ASYNCH 0MB/1MB 256KCRTLRSMT X06 or higher
                    202653-603   PCBA MBD ASYNCH 0MB/1MB 256K THDRSMT X03 or higher
                    202653-631   PCBA MBD BMS P5A 0MB/1MB 256K SMT    X03 or higher
                    202653-651   PCBA MBD PRMMX P5A 0MB/0MB 256K SMT  X03 or higher
                    202653-661   PCBA MBD ARMT P5A 0MB/1MB 256K SMT   X03 or higher

                    202654-001   PCBA MBD P90 8MB/1MB 256K CACHE      X06 or higher
                    202654-011   PCBA MBD ARMS P90 8MB/1MB 256K       X03 or higher
                    202654-012   PCBA MBD ARMS P90 16MB/1MB 256K      X03 or higher
                    202654-021   PCBA MBD BMS-T P90 8MB/1MB 256K      X03 or higher
                    202654-022   PCBA MBD BMS-T P90 16MB/1MB 256K     X03 or higher
                    202654-031   PCBA MBD BMS P90 8MB/1MB 256K        X03 or higher
                    202654-032   PCBA MBD BMS P90 16MB/1MB 256K       X03 or higher
                    202654-041   PCBA MBD BMS-L P90 8MB/1MB 256K      X04 or higher
                    202654-042   PCBA MBD BMS-L P90 16MB/1MB 256K     X04 or higher
                    202654-061   PCBA MBD ARMT P90 8MB/1MB 256K       X03 or higher
                    202654-062   PCBA MBD ARMT P90 16MB/1MB 256K      X03 or higher
                    202654-101   PCBA MBD ASYNCH 0MB/1MB 256KC ADV    X05 or higher
                    202654-131   PCBA MBD BMS P54C 0MB/1MB 256K       X03 or higher
                    202654-141   PCBA MBD BMS-L P54C 0MB/1MB 256K     X04 or higher
                    202654-161   PCBA MBD ARMT P54C 0MB/1MB 256K      X03 or higher
                    202654-631   PCBA MBD BMS P54C 0MB/1MB 256K SMT   X03 or higher
                    202654-661   PCBA MBD ARMT P54C 0MB/1MB 256K SMT  X03 or higher
                    202654-601   PCBA MBD ASYNCH 0MB/1MB 256KC SMT    X05 or higher

                    202671-001   PCBA MBD P60 16MB/1MB 256KC PANTHR   X06 or higher
                    202671-002   PCBA MBD P60 16MB/1MB 256K PANTHR302 X02 or higher
                    202671-101   PCBA MBD P-0 0MB/1MB 256KC PANTHR    X06 or higher
                    202671-102   PCBA MBD P-0 0MB/1MB 256K PANTHR 302 X02 or higher
                    202671-601   PCBA MBD P-0 0MB/1MB 256K PNTHR SMT  X06 or higher
                    202671-602   PCBA MBD P-0 0MB/1MB 256K PANTHR 302 X02 or higher