hello
what is number of your z80 pin outside
 
1    U    40
2          39      
+          +
+          +
19         22
20         21
 
1   is A11
20 is IORQ
21 is RD
40 is A10
 
is not possible the z80 is working if a pin of this 4 is not connected
 
Bye
 
Jipe
 

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