Fixed stupid dangerous mistake in io_out initialisation! (introduced …

…accidentaly 1 commit earlier)

src/ci2406_z80.v

@@ -205,7 +205,7 @@ module ci2406_z80(
 
     // 4 input control pins
     assign {io_oeb[35], io_oeb[31:30], io_oeb[4]} = {4{1'b1}};   // 1 = Input
-    assign {io_oeb[35], io_out[31:30], io_out[4]} = {4{1'b0}};   // Initialize otherwise undriven pins to 0
+    assign {io_out[35], io_out[31:30], io_out[4]} = {4{1'b0}};   // Initialize otherwise undriven pins to 0
 
     wire data_oe;
     z80 z80 (