The robot controller CAN function without the operator interface. To enable this, the team number dipswitch on the OI must be set to 0, then the OI must be tethered to the RC to download the team number setting to it. Once the tether is disconnected and the RC is reset, the autonomous loop will execute forever and the RC will ignore any radio signals, until the team number is changed back to a non-zero value using the tether method.
However, it would be impossible to switch back and forth between OI and non-OI mode on the fly - the team number must be changed each time with the tether cable.
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Originally Posted by Matt Krass
If by last bit down you mean the left most, that's the MSB (Most Significant Bit) and that was used to unlock extra radio channels on pre-2005 controllers I think.
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Just to clarify, setting the MSB enables the extra radio channels on the 2005 and later controllers, while the pre-2005 controllers required you to ground a specific pin on the Competition port in order to do so.