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AST RESEARCH, INC.          TECHNICAL BULLETIN # 1215               6-6-95

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SCO UNIX INSTALL FAILS WITH MANHATTAN G590


PROBLEM

During installation of SCO UNIX and ODT version 3.0, in a Manhattan G590 
with the DPT PCI SCSI Controller (PM3224), after loading the DPT UNIX driver, 
the operating system displays the following error message: 

"WARNING: SCSI ADAPTER: CAN NOT INSTALL INTR VECNO=10, 
TYPE=2, IPL=5, VECTOR 10 IS PRIVATE."


CAUSE

SCO UNIX requires IRQ 10 to be reserved for its own use.  The Manhattan G590 
has assigned the DPT PM3224 PCI SCSI Controller to IRQ10, causing the 
installation to fail.  There is no mechanism for changing the IRQ assignment 
of a PCI adapter in a PCI/ISA based system.


SYSTEMS AFFECTED
AST PART NUMBER AND DESCRIPTION     REVISION
	
501723-XXX      MANHATTAN G590      All Models


SOLUTION

Manhattan G590 BIOS Release 2.00 (P/N 905545-038) resolves this issue by 
changing the manner in which the IRQs are assigned.  IRQ10 is now used as 
the last IRQ to be assigned by a device installed in the system.

File 05545038.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 on the Manhattan G590 BIOS, see Software Bulletin 
# 0186 in the SBS library of AST's BBS.