I was hanging out at a coffee shop playing on my arduboy when I got to thinking what if we could use an Arduino uno as a flash drive that can run an uploader for a library of arduboy games. To load different games one would simply press a button plugged into some headers with the arduboy plugged in and viola ultra portable arduboy library. I’m really bad with Arduino IDE so I thought I might post my idea here to see what the community comes up with.
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Yeah, that would be possible, actually. You would have to connect it via USB and then somehow store the games onto the UNO.
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I think you would need a Due or better to do this AFAIK the Uno cannot act as a USB host.
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Does it require host for that? Isn’t it just serial communication, changing baud rates a few times? Hmm… Maybe I am mistaken.
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One of the devices needs to act as a host. The Arduboy cannot do this, so the other end (whatever that is) must.
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You could do this if you combined the Uno with some external chip that can act as a USB host, like the Arduino USB Host Shield, or something similar.
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That one is actually discontinued. You could try this one instead > https://www.sparkfun.com/products/9947
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If that’s the case, they should disable the ‘buy now’ button and replace it with a ‘discontinued’ button like they have on other pages.
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Not 100% sure if this is useful but I think this may be a step in the right direction
https://www.arduino.cc/en/Tutorial/ArduinoISP
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…if you had one of @n602’s awesome 3D-printed cases with the ICSP header made easily accessible, then yes, this would work! 
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