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