Merge pull request #202 from lynchaj/patch-3

Create button2.asm

Source/Apps/button2.asm

@@ -0,0 +1,19 @@
+; test program for user button on Z80 MBC clock board
+; by Andrew Lynch, 6 Jul 2021
+
+
+  ORG    00100H
+
+MAIN_LOOP:
+
+	IN	A,($70)		    ; READ USER BUTTON STATUS
+	AND	%01000000	    ; REMOVE ALL EXCEPT USER BUTTON (D6)
+	    			    ; 0=PRESSED, 1=NOT PRESSED
+	JR	NZ,MAIN_LOOP	; IF NOT PRESSED TRY AGAIN
+
+	LD	A,%00000011	    ; TURN ON BOTH USER LEDS
+	OUT	($70),A		    ;
+
+    RET
+    
+    end