Author Topic: USB 2.0 and USB 3.0  (Read 3539 times)

Offline LogicalUnit

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USB 2.0 and USB 3.0
« on: 04/Dec/2012 11:51:12 PM »
Hi all,

I just got my Retrode delivered yesterday, and I had some trouble setting it up. Windows did not recognise any device when I connected the Retrode to a USB 2.0 port with a PAL SNES game inserted. I tried several times with the same result. Eventually I tried a USB 3.0 port and it worked like a charm.

I have 2x USB 2.0 ports on the front of my machine, and one of them has a mini bluetooth dongle. It was the other USB 2.0 port that didn't work.

Are we sure that USB 2.0 can deliver enough current to power the Retrode, especially if there are other devices connected?

Offline Matthias_H

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Re: USB 2.0 and USB 3.0
« Reply #1 on: 05/Dec/2012 05:55:10 PM »
Are we sure that USB 2.0 can deliver enough current to power the Retrode, especially if there are other devices connected?
Absolutely. I once did a test with the "Golden" Retrode, and it got nowhere near the maximum 500 mA that the USB 2.0/1.1 standards define. More like 50-100 mA with all cartridge slots in use, maybe slightly more with controllers connected. However, I can imagine there are probably tons of non-compliant ports out there. If the current that one port can deliver depends on devices on other ports, that would already be a violation of the standard.

What's the UHCI/OHCI chipset in your machine? Could it be that the front ports are actually both on the same bus-powered hub?
« Last Edit: 05/Dec/2012 06:13:15 PM by Matthias_H »
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Offline emuDrache

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Re: USB 2.0 and USB 3.0
« Reply #2 on: 05/Dec/2012 07:00:21 PM »
go into device manager,

click on 'Universal Serial Bus controllers' to expand it.

right click on 'USB Root Hub', select properties.
click on the Power tab.

it will show you how much power your device is drawing. and should say how much power is available per port.

standard is 500mA per port

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Offline LogicalUnit

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Re: USB 2.0 and USB 3.0
« Reply #3 on: 06/Dec/2012 04:34:11 AM »
Everything appears to be working now. Perhaps for some reason my Bluetooth dongle was confusing it.