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Windows 7: High I/O causes drives to disappear, garbled displays, USB malfunctio

15 Nov 2015   #11

Windows 7 Pro x64

An update concerning the Altera DE2 board.

If the Altera board is plugged into mains power before the USB cord, it will knock the USB controller out. When the Altera USB cable is unplugged from the system, the mouse will resume operation. But the keyboard will not come back online. To make the keyboard work again the computer has to be shut down and power has to be unplugged from the system for 10ish seconds before it will work again.

My System SpecsSystem Spec
15 Nov 2015   #12
Mellon Head

Win 7 Pro x64/Win 10 Pro x64 dual boot

I thought that the DE2 was USB powered as well as mains. So you wouldn't have to plug the mains in at the same time as the USB. I was under the impression that the board did not require external power unless it was driving something with high current requirements.

That being said, I could be wrong, I don't own one. But you would think that the two supplies would be isolated from each other, so that the USB ports would not be damaged when an external power source was plugged in. I've been considering buying a DE2. I may reconsider.
My System SpecsSystem Spec

 High I/O causes drives to disappear, garbled displays, USB malfunctio

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