Strange behavior with screen and Arduino uno serial port

doov:
Interesting.. I'm using 1.01. When you say that the IDE is setting the serial port do you mean the computer's port or the hardware's port?

I don't know what you mean by hardware port, arduino hardware port?
The 115200 is not very accurately set since 16MHz and 115200 are not matching. This offset can be compensated if the usb ttl chip is set at a proper rate, not exactly 115200. I thought arduino ide does that.