    AST RESEARCH, INC         TECHNICAL BULLETIN #0910                 4-13-94

                BRAVO NB 486/25 SX EXTERNAL KEYBOARD BEEPS

    PROBLEM:        When the unit is attached to an AST external keyboard using
                    the QUANTA keyboard controller, the unit beeps every 10 to 20
                    characters and the system eventually locks up.

    CAUSE:          BIOS 1.04 exhibited external device conflicts.

    SYSTEMS             AST                                         REVISION
    AFFECTED:       PART NUMBER     DESCRIPTION                       LEVEL

                    501112-001      BRAVO 486/25 SX EXT KBD            All
                    230386-001      PS2-AT KEYBOARD ADPTPWRE           All

    SOLUTION:       Upgrade the system and keyboard controller chip.  This is part
                    of the upgrade kit which includes a FLASH diskette.  Part
                    numbers are listed below:

                     AST                                              REVISION
                   PART NUMBER     DESCRIPTION                          LEVEL

                   237025-001      SYS CNTLR BNB/AEX 4/25 V3F11 R1.00     A
                   905534-031      BIOS FL UPD AEX/BNB 4/25 R1.05         A
                   501473-001      BIOS UPG BNB/AEX SX25 R1.05            01