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ATTO UL4x and UL5x SCSI Ultra 320 Drivers

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Year released:
[www].se [ftp].se [mirror].us [mirror].de (114.10 MB)
MD5: 5ca3da1c0689643a58064aa8bb412fbe
For Mac OS X
Guides on emulating older applications

These are the drivers and BIOS for the ATTO UL4x and UL5x series of SCSI Ultra 320 cards. The archive contains several different drivers versions for OS X (OS X 10.3 - 10.8. The archive also includes four different versions of the ATTO Configuration Tool and some documentation. These drivers are no longer available from ATTO's site and have been added here for those that need them.

Below card models are pulled from the included readme file.

Supported Adapters


Architecture: PPC x86 (Intel:Mac)

OS X 10.3 - 10.8 plus one of the card models listed above.
It will also install on OS X 10.13.6 (High Sierra)


old_gray_wizard's picture
by old_gray_wizard - 2020, September 23 - 4:11pm

Thanks for this software, I can confirm that this software will install on macOS 10.13.6 (High Sierra) and macOS 10.14.6 (Mojave) but complains that the certificate is out of date.

romulus's picture
by romulus - 2020, May 1 - 3:36am

Found it and it works. Hopefully this helps someone in the same position.
See the link for the UL4D/5D Windows x64 driver here:

romulus's picture
by romulus - 2020, April 30 - 9:22am

Looking for the ATTO UL5D Windows x64 drivers for Bootcamp purposes...anyone have a link or know where to find them since ATTO has removed them from their site?
I made sure to download the Mac Drivers I'd need earlier this year. Now that I've installed bootcamp, I'm looking to get them installed on Windows x64. I've downloaded these, thanks for posting the complete set.

soudesune's picture
by soudesune - 2020, April 18 - 2:33pm

Before you stick it in to the MDD, check whether the card is PCI-X or just 64-bit PCI. One is 3.3V, the other 5V. I suspect that the card may support both, but check it up first. Register with to gain access to their site and download the user manual.
This link shows that it supports both:
Once you are happy that the UL4S runs in your MDD, try booting from it. You may need to format the drive on the card first though.
Do you have an LVD cable with terminator on it? I guess that you won't get U320 speeds on Mac OS 9 but you should on Mac OS X with the correct drivers.
Have a look here btw:

rbshep's picture
by rbshep - 2020, April 18 - 8:39am

Thanks for this! I found a UL4S in a junk pile, hoping it will work with my MDD2003. I had pretty much given up on the idea of finding the correct firmware until now Smile

I don't suppose you know if the card is bootable under OS9?