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| F2 (Down)- | Downloads
      incoming data from a host computer into a file. | 
| F3 (Up) - | Uploads prepared data from a file for transmission to a host computer. | 
| F4 (Full/Half) - | Commutates between full duplex and half duplex modes of data transmission. | 
| F5 (Echo) - | When the M10 is connected to a printer, this key prints what is on the screen. | 
| F8 (Bye) - | Returns user to Entry mode. The response to the prompt Disconnect? must be Y (Yes) to free the telephone line. | 
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