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PIC RS232 to USB Only PC - Which Adaptor?

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I've started looking through Nigels' RS232 tutorials. I've got two PIC18F2420's connected, one sending a byte to the other which it then sends it to an lcd. I want to connect my PC to a PIC but the PC only has usb ports. I need an adaptor. Will the cheapest of these three do the job?

Thanks in advance for any help.


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If you can find one there are USB to TTL serial adapters (parallax has one) which can be directly connected to the PICs USART pins (no MAX232 needed)
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