implement $EA7E entry point and fix $EA31 entry point. Issue #20

c64/kernal/ioinit.s

@@ -15,6 +15,11 @@ ioinit:
 	sta $D020
 	sta $D021
 
+	;; Turn off sprites
+	;; (observed hanging around after running programs and resetting)
+	lda #$00
+	sta $D015
+	
 	;; Enable CIA1 IRQ and ~50Hz timer
 	;; (https://csdb.dk/forums/?roomid=11&topicid=69037)
 	lda #$7f