Have you checked your SCSI cables & termination - dodgy 
        termination could cause what you describe.

        If that doesnt help could you try swapping the drives & controller
	across to your 486 to see if the machine is at fault?
	(Hopefully the 486 is PCI? :)


		David/abs	david@{mono.org,southern.com,mhm-internet.com}

System Manager: Southern Studios Ltd, PO Box 59, London N22 1AR.
Satisfied User: NetBSD, free Un*x {i386,sparc,mac68k,+more} 'www.netbsd.org'.
  System Admin: MHM Internet, 14 Barley Mow Passage, Chiswick, London W4 4PH.
         SysOP: Monochrome, Largest UK Internet BBS - 'telnet mono.org'.

On Thu, 31 Oct 1996, c5666305 wrote:

> Hello,
> 
> Me again.  The quoestion was issued by me.  I would like to specified clearly
> the configuration of my system so that you may have a clear picture and I hope
> you can help me to get out of the trouble (system hangs when using povray for
> some complex image, like ry tracing).  I am sorry about my last message which
> was not clearly stated out the whole picture.
> 
> Mohterborad : VEGA P54C-IDP system board (dual pentium 90 - 100)
> RAM         : 80M
> O/S         : NetBSD 1.2B (The lastest on)
> Disk Controller : AHA 2940 (BIOS 2.1v)
> Hard disk   : segate 51080N (1), Quatum TRS840S (2) configured as ccd0
> CPU         : Pentium 90
> Video Card  : Mach64 WinTurbo
> network Card: NE2000 compatble
> Comm Card   : Unique 26550 FIFO
> 
> The system hanged frequency when I tried to generate complex images which 
> was not happened in my 486-box (using ide disk only).  I need suggestions 
> to figure what is the problem with my system.  Thank you very much in advace.
> 
> cheers
> 
> Clarence
> 
>