Z80 CPU Pin Description:

                     _________    _________
                   _|         \__/         |_                  
             A11  |_|1                   40|_|  A10
                   _|                      |_                  
             A12  |_|2                   39|_|  A9              
                   _|                      |_                  
             A13  |_|3       Z80 CPU     38|_|  A8              
                   _|                      |_                  
             A14  |_|4                   37|_|  A7              
                   _|                      |_                  
             A15  |_|5                   36|_|  A6      
                   _|                      |_                  
             CLK  |_|6                   35|_|  A5      
                   _|                      |_
              D4  |_|7                   34|_|  A4      
                   _|                      |_                  
              D3  |_|8                   33|_|  A3                  
                   _|                      |_                  
              D5  |_|9                   32|_|  A2                  
                   _|                      |_                  
              D6  |_|10                  31|_|  A1                  
                   _|                      |_                  
             VCC  |_|11                  30|_|  A0                 
                   _|                      |_                  
              D2  |_|12                  29|_|  GND           
                   _|                      |_                  
              D7  |_|13                  28|_|  /RFSH              
                   _|                      |_                  
              D0  |_|14                  27|_|  /M1                
                   _|                      |_                  
              D1  |_|15                  26|_|  /RESET          
                   _|                      |_                  
            /INT  |_|16                  25|_|  /BUSRQ          
                   _|                      |_                  
            /NMI  |_|17                  24|_|  /WAIT          
                   _|                      |_                  
           /HALT  |_|18                  23|_|  /BUSAK         
                   _|                      |_                  
           /MREQ  |_|19                  22|_|  /WR            
                   _|                      |_                  
           /IORQ  |_|20                  21|_|  /RD            
                    |______________________|