From: dherman@cape.UWaterloo.ca (Dennis Herman)
Subject: Re: Adaptec 1542B and ATI Ultra+ Conflict running Windows 3.1
Keywords: Adaptec, SCSI, ATI Ultra, Win
Organization: University of Waterloo
Date: Wed, 23 Dec 1992 20:40:36 GMT

In article <BzL4M9.166@watserv2.uwaterloo.ca> jching@watnow.uwaterloo.ca (John Y. Ching) writes:
 
I had a similar problem with a new Fujitsu 2624FA drive and a SCSI control
ler . Turns out that these new FAST SCSI drives really push some of these
controllers and the controller craps out if the drive tries to do fast
synchronous transfers. My controller card ( not adaptec) does work with 
other fast SCSI drives but not with others. It appears that there is not
a official standard for FAST SCSI so the manufacturers implement it 
differently. 

My temporary fix was to force the disk to work in async mode ( old SCSI 1)
by setting a jumper on the disk. 
The controller manufacturer will be sending me a new card in Jan that 
apparently fixes the problem. For now I'm am working fine but I have   
noticed that if some unweildy applications leave corrupted files on 
the disk ( cross linked ) then I get windows hanging. Subsequently running
chkdsk /F appears to fix the problem and everything works fine. You may 
want to try this first. Then I would phone adaptec to see if they have
had problems with your disk drive model and see if they have a fix. 
Otherwise I would ask them to tell you how to set the controller to 
Async. mode. 
       
By the way I have a 33-486 with an ATI Ultra ( not plus) and a fujitsu  
2624FA.       

Dennis
>Hi there,
>
>I just purchased an ATI Graphics Ultra+ card and am having all kinds
>of problems trying to get it to work.  My problem is that Windows
>dies upon loading when I try to use the Mach32 drivers that came
>with the ATI card.  My system is an ISA 486/33 with an AHA1542B
>SCSI controller and a Fujitsu drive.
>
>Everytime I start Windows, the logo is displayed normally.  But right after
>that, I see a bit of garbage flashing quickly on my screen.  Then the
>Program Manager comes up, and everything freezes.  After two days of trying 
>everything I could think of, I finally traced the problem to my SCSI controller.
>It just happened that my other computer (a 386DX25) has an IDE drive.  So I 
>took out the 1542B and pluged in an IDE card with the "borrowed" IDE drive from
>my other machine.  Windows and the Mach32 drivers worked flawlessly on my 486
>with the IDE drive.
> 
>My 1542B uses the default settings (DMA 5, IRQ11, DC00, base addr 330H etc.).
>Regular VGA and 8514/a drivers that came with Win31 worked fine with the ATI
>card, so I don't think it's a hardware problem.  The ATI card uses base address
>2e8-2ef.  I have tried excluding the ROM location in SYTEM.INI and config.sys
>(X=C000-C7FF) with no success.  I have also tried different DMA and IRQ settings
>on my 1542B.  I am using ASPI4DOS,SYS driver dated 6-20-91.  Is there a newer
>one available?  The memory aperture feature of the ATI card is another
>possibility, for that is the main difference between the 8514/A driver and
>the mach32 drivers.  As I said, 8514/a driver works fine except it is a
>bit slower and has no virtual desktop support.  Any other suggestions?
>
>Thanks.
>
>- John
>
>-- 
> John Y. Ching (jching@watnow.waterloo.edu)     
> Pattern Analysis and Machine Intelligence Group
> Department of Systems Design Engineering      
> University of Waterloo, Canada