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AST RESEARCH, INC.           TECHNICAL BULLETIN # 1159              4-26-95

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			 ADAPTEC PCI SCSI CONFLICT IN MANHATTAN P SERVER 


PROBLEM

Manhattan P systems using the integrated NCR SCSI controller and two Adaptec 
2940 PCI SCSI controllers will not see the last physical drive attached to 
the second Adaptec controller under Novell Netware 3.12.


CAUSE

The integrated NCR SCSI controller is in conflict with the second PCI slot 
(PCI slot #2) on the Manhattan P system board.  The conflict arises due to 
the configuration of the interrupts for the NCR SCSI controller.  
The interrupts are fixed, and even when disabled, they conflict with the 
add-in device in PCI slot #2.

SYSTEMS AFFECTED
AST PART NUMBER AND DESCRIPTION    REVISION

501500-XXX     Manhattan V5090     All Models
501502-XXX     Manhattan P5090     All Models

SOLUTION

AST BIOS release 1.09 resolves the interrupt conflict with the on-board NCR 
SCSI controller.  The system BIOS should be flashed to a minimum level of 
release 1.09 to resolve the problem.

BIOS Release 1.09 has AST Part Number 905547-038 and it is available on the 
AST On-line BBS and On-line services.

File 05547038.EXE can be found on AST's BBS (817) 230-6850, in the "Systems"
file area.  AST's BBS supports modem speeds up to 28.8k bps.
The above file will also be posted on: 

CompuServe 
Go ASTSUPPORT

AST Worldwide Web Site
http://www.ast.com

For further information regarding BIOS 1.09, see Software Bulletin # 0178C.