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    AST RESEARCH, INC.           TECHNICAL BULLETIN # 1008                 11-7-94

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                         BRAVO MS P60/90 DMA DATA TRANSFER ERRORS

    PROBLEM:        Some Bravo MS P60/90 systems may report DMA data transfer
                    errors.

    CAUSE:          The resistor was not giving enough time delay to Data Hold
                    after the DMA cycle.

    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 DMA data transfer errors, upgrade the 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 256K CRTLRSMT 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 256K CRTLRSMT 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 PANTHR 302 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