This information will allow the use of an Icom HM-56A DTMF mic with an Icom 706. I have ONLY used this on my 706mkIIG so test it on all others at your own risk.
 You will need an 8 conductor (RJ-45) ethernet connector (male) and a crimping tool. Radio shack has a non-crimp version if you don't want to invest $45 for a new tool.
 If you place the tab down, pin 1 is the furthest to the left (see picture)
  
 
The color code is:
1. Red
2. Black
3. 
4. Green
5. Braid
6. 
7. Blue
8. 
 
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