Problems in XP enabeling UDMA66 on the VIA Apollo Pro 133A Chipset (TYAN S1854 MoBo)

ok, have a shiny new 80 pin IDE connector, two drives on the channel.
BIOS says UDMA-4 (UDMA-66) enabled, Windows XP says UDMA-3 (UDMA-33).

Can't find any info anywhere or any registry edits to enable UDMA-66
in XP on this chipset (just the intel hack - added the key and nothing
changed).


ideas?? TIA

 

What are the two drives on the channel? Are both UDMA 66? Are they set
as Master and Slave or Cable Select?

 

Using 2 seagate drives that are both ATA100 - 40GB one is set to
master, 80GB is slave. IDE Cable is brand new and 80 pin.

BIOS screen confirms its set to UDMA-66 (thats the max for the Tyan
S1854 mobo).

Tried just the master drive on the primary IDE channel by itself,
didn't make a difference.

It appears to be set by windows... man... I'm stumped!!

 

That is odd. Unfortunately, I have no idea what the solution is. XP
seems to set the DMA mode on it's own and there is only a selection
between PIO mode and DMA if available.
Hopefully, someone will come along with an idea what to do.

 

Howdy!

And how is the cable run? If you turn the cable around, the cable
doesn't ID to the MB as an ATA-66+ cable.

RwP

 

Maybe some help here:

Ultra DMA Mode 6 Devices Are Not Enabled on VIA Motherboards
After You Install Windows XP SP1
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q327805

Windows XP Service Pack 1 Incorrectly Identifies the VIA
VT82C686B Chipset as Supporting Ultra DMA Mode 6
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q813861

Integrated Technology Express Devices May Not Work with Windows XP
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q329180

HOW TO: Troubleshoot Issues That Occur When You Write Data
to a CD-R or CD-RW Optical Disc in Windows XP
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q324129

How to Troubleshoot Issues with Reading CD, CD-R, CD-RW,
and DVD Discs
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q321641
HOW TO: Manage Devices in Windows XP
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q283658

HOW TO: Configure Devices By Using Device Manager in Windows XP
http://support.microsoft.com/default.aspx?scid=kb;en-us;307970

 

Hi,


The section of cable with the two clips on each end are attached to
the motherboard. The other two pieces that are notched are attached to
the drives... haven't tried reversing them. I did try a plain ole' 40
pin IDE cable on one of the drives just to see what would happen and
it forced it do UDMA-1 for some reason (again BIOS shows UDMA-4).


Quirky!

 

Tried the top 2, my chipset is VT82C694X but the problem people were
having is oddly similar - UDMA-5 drive/board but XP will only run in
UDMA-4.

Anyway, have the latest IDE VIA drivers installed on this hunk.. this
is starting to drive me insane.


I wanted to get the ABIT VP6 (for dual p3 1ghz CPUs and an extra DIMM
bank).. it has 4 IDE channels, ATA100 and RAID but it has the same
VIA 133 VT82C694X chipset... if the drivers are going to be messed up
with that board its kinda pointless.

 

In my limited experience, that chipset is shit.

It got harder and harder to find references to it on the Via site, about a
year ago. And any reference to it in their forums seems to be absent.

<insert convenient conspiracy theory here ____________>

 

That part is not quirky. ATA-66 and above require a 80 conductor, 40
pin cable.

 

I am inclined to agree on this... can't find any other descent dual
p3/1ghz boards with 4 DIMMS & RAID though so Abit VP6 it is.


Found the answer to my problem on the VIA forums though... sort of odd
that you have to uninstall their driver to fix the bloody problem..
thats some pretty questionable support


http://forums.viaarena.com/messageview.cfm?catid=6&threadid=45244&FTVAR_MSGDBTABLE=

1) Goto Device Manager
2) Double-click on the VIA IDE Controller and choose 'Update Driver'
3) Choose 'Install from a list or a specific Location'
4) Choose 'Don't search, I will choose the driver to install'
5) Choose 'Standard Dual PCI IDE Controller', if not there then back
to step 3 choose 'Install the software automatically' and then repeat
steps again from number 1 as it will appear then.
6) You will after after successfully updating will need to reboot the
system !

 

Thanks. I put *that* mobo in my parents machine. It won't cause anyone any
problems there.

 

Hi Tim
You may want to look here.
http://www.pureperformance.com/js/showtip.asp?id=23 . I have udma66 enabled
without this patch in xp but I am only running 1 udma66 (ata100) HD. In
device manger it is running in ultra dma mode 5 at present. Try forcing it
with the reg patch as I've read that xp does not always (so it seems :-o)
enable udma66. (backup reg first!!! edit the reg manually. It will give you
more bandwidth even if this does not fix your problem.

 

Hi - thats the first thing I tired but it didn't work for my
particular situation. Adding the UDMA66 DWORD to the reg will only
work on the Intel chipsets apparently!

 

Didn't know that. Cheers )
What about the cable like Ralph Wade Phillips suggested or jumper switches
or bios settings? If you had udma66 running ok before, then maybe the cable
is at fault. Good luck anyways. )

 

Howdy!

As has been pointed out, that's due to the MB not setting above
ATA-33 on a 40 pin cable.

I'm anxiously watching - I have one customer with one machine on a
SiS chipset that runs PIO 4 on a UDMA 4 drive ... with ATA-66 IDE ports.

RwP