more work on Mega65 native mode

src/basic/engine_runtime/select_device.s

@@ -1,23 +0,0 @@
-// #LAYOUT# STD *       #TAKE
-// #LAYOUT# M65 BASIC_1 #TAKE
-// #LAYOUT# *   BASIC_0 #TAKE
-// #LAYOUT# *   *       #IGNORE
-
-// XXX for Mega65, it should be available in BASIC_1 segment only
-
-select_device:
-
-	// 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.
-	//
-	// If current device is not a drive, set device to 8 (first drive number)
-	// Device number is left in X, for SETFLS Kernal routine
-
-	ldx FA
-	cpx #$08
-	bcs !+
-	ldx #$08
-!:
-	rts