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AST RESEARCH, INC.         TECHNICAL BULLETIN # 1117               3-28-95

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	 BRAVO MS-T P/90 BEEPS AT BOOTUP WITH ADAPTEC 1570 ADAPTER INSTALLED


PROBLEM

When a SCSI hard drive is connected to an Adaptec 1570, the adapter card may 
cause the Bravo MS-T P/90 system to generate beeps at bootup.

CAUSE

The Adaptec 1570 adapter card is not compatible with the Bravo MS-T P/90 
Plug-n-Play system. 

During the ROM scan sequence, the Adaptec 1570 BIOS selects system memory 
occupied by BIOS housekeeping during POST.  This area contains variables, 
tables, and pointers used to decide where Plug-n-Play resources are to be 
setup.  The Adaptec BIOS uses this same area for its initialization, erasing 
the data needed for use later.  When the beep code is generated, it usually 
wipes out a Memory Control Block the BIOS needs to finish its work.

SYSTEMS AFFECTED
AST PART NUMBER AND DESCRIPTION

501660-001     BRAVO MS-T P/90 

SOLUTION

Use an adapter card that is compatible with Plug-n-Play systems.