more work on Mega65 native mode

src/kernal/board_m65/mega65_viciv_unhide.s

@@ -0,0 +1,24 @@
+// #LAYOUT# STD *        #TAKE
+// #LAYOUT# X16 *        #IGNORE
+// #LAYOUT# *   KERNAL_0 #TAKE
+// #LAYOUT# *   *        #IGNORE
+
+//
+// Routine to unhide Mega65 extra registers
+//
+
+
+#if ROM_LAYOUT_M65 || CONFIG_KEYBOARD_C65 || (CONFIG_MB_MEGA_65 && (CONFIG_TAPE_NORMAL || CONFIG_TAPE_TURBO))
+
+
+viciv_unhide:
+
+	lda #$A5
+	sta VIC_KEY
+	lda #$96
+	sta VIC_KEY
+
+	rts
+
+
+#endif