initial support for Mega65 extra ROM

c64/basic/select_device.s

@@ -1,7 +1,9 @@
+#if ROM_LAYOUT_STD || (ROM_LAYOUT_M65 && SEGMENT_BASIC_0)
+
 
 select_device:
 
-	// Take last device number, make sure it's a drive - 8 or above. Above 30,
+	// Take last device number, make sure it is a drive - 8 or above. Above 30,
 	// although illegal for IEC we also consider a drive, as they exists
 	// drivers assigning these numbers to CBM-DOS capable devices - like some
 	// IEEE-488 carts.
@@ -9,11 +11,12 @@ select_device:
 	// If current device is not a drive, set device to 8 (first drive number)
 	// Device number is left in X, for SETFLS Kernal routine
 
-	// Note: if tape support is introduced here, make sure DOS wedge won't get broken
-
 	ldx FA
 	cpx #$08
 	bcs !+
 	ldx #$08
 !:
 	rts
+
+
+#endif // ROM layout