AST RESEARCH, INC.           TECHNICAL BULLETIN # 1319        10-11-95



               ADAPTEC AHA2940 AND MANHATTAN P/V SERIES SERVERS

PROBLEM:     When installing an Adaptec AHA2940 PCI SCSI controller in 
             the Manhattan P/V series of servers, the system will hang 
             and generate the following error message:

                PCI error 83090020, 830B0000

             The problem only occurs when the embedded NCR SCSI 
             controller is enabled and active (i.e. drives are attached 
             to both controllers).   

CAUSE:       A PCI resource allocation conflict exists between the 
             Adaptec 2940 card and the embedded NCR SCSI controller.

SOLUTION:    Update the Adaptec 2940's BIOS to version 1.16/checksum 
             6E00 or current revision.

             In order to have the firmware updated, the customer can 
             call Adaptec support (408-934-7274) and identify the issue 
             to them.  Adaptec will verify the failure and if true, 
             ship the customer an updated BIOS PROM.  The replacement 
             procedure should be completed in compliance with proper 
             electrostatic protocol. (i.e. Board and PROM should not be 
             handled without proper grounding).

SYSTEMS 
AFFECTED:    All Manhattan P/V series servers

             AST PART NUMBER DESCRIPTION

             501500-XXX      Manhattan V Series  P5090
             501502-XXX      Manhattan P Series  P5090
             501503-XXX      Manhattan V Series  P5100
             501830-XXX      Manhattan V Series  P5133