Ass USER1 jumper on an otherwise unused input.

2063-Z80-cache.lib

@@ -256,6 +256,25 @@ X O3 9 500 200 200 L 50 50 1 0 T
 ENDDRAW
 ENDDEF
 #
+# Connector_Generic_Conn_01x02
+#
+DEF Connector_Generic_Conn_01x02 J 0 40 Y N 1 F N
+F0 "J" 0 100 50 H V C CNN
+F1 "Connector_Generic_Conn_01x02" 0 -200 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Connector*:*_1x??_*
+$ENDFPLIST
+DRAW
+S -50 -95 0 -105 1 1 6 N
+S -50 5 0 -5 1 1 6 N
+S -50 50 50 -150 1 1 10 f
+X Pin_1 1 -200 0 150 R 50 50 1 1 P
+X Pin_2 2 -200 -100 150 R 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
 # Connector_Generic_Conn_01x05
 #
 DEF Connector_Generic_Conn_01x05 J 0 40 Y N 1 F N

2063-Z80.sch

@@ -1760,7 +1760,7 @@ Wire Wire Line
 Wire Wire Line
 	3500 6650 4200 6650
 Wire Wire Line
-	3500 6550 4200 6550
+	3500 6550 3650 6550
 Wire Wire Line
 	3500 6450 4200 6450
 Wire Wire Line
@@ -4042,4 +4042,37 @@ Wire Wire Line
 	5800 7050 6350 7050
 Text Notes 11400 5650 1    39   ~ 0
 Populate R10 when the CTC is not present. \nElse optional.
+Text Label 3700 6550 0    50   ~ 0
+USER1
+Wire Wire Line
+	3650 6550 3650 5500
+Connection ~ 3650 6550
+Wire Wire Line
+	3650 6550 4200 6550
+$Comp
+L Connector_Generic:Conn_01x02 J9
+U 1 1 6157539A
+P 3650 5300
+F 0 "J9" V 3568 5112 50  0000 R CNN
+F 1 "Conn_01x02" V 3523 5112 50  0001 R CNN
+F 2 "Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical" H 3650 5300 50  0001 C CNN
+F 3 "~" H 3650 5300 50  0001 C CNN
+	1    3650 5300
+	0    -1   -1   0   
+$EndComp
+$Comp
+L power:GND #PWR018
+U 1 1 61603B1F
+P 3750 5550
+F 0 "#PWR018" H 3750 5300 50  0001 C CNN
+F 1 "GND" H 3755 5377 50  0000 C CNN
+F 2 "" H 3750 5550 50  0001 C CNN
+F 3 "" H 3750 5550 50  0001 C CNN
+	1    3750 5550
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	3750 5550 3750 5500
+Text Notes 3500 5200 0    50   ~ 0
+User Input
 $EndSCHEMATC