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Altera_Forum
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15 years ago

USB Blaster shown as "Unknown Device"

Hi there, We have a few labs that run Quartus 9.1 SP2 and students can connect up DE2 boards and other USB Blaster devices. All machines are running Windows XP with SP3. Lately I noted th...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Just a bit further testing.

I found the problem seems to affect a certain type of computers, namely Dell Precision 390. I also have Dell Precision 370 and Optilex 980 machines and they are all okay.

I suspect perhaps it is something to do with the chipset driver affect the USB Subsystem.

One thing I also suspect is that on a initially good Dell 390, as soon as I hooked up a DE0 board it will be loaded as an Unknown Device and after that other USB Blaster will be seen as Unknow Device as well.