Update mov_r_FAC1_VAR

src/basic/math_mov/bbd0.mov_r_FAC1_VAR.s

@@ -3,9 +3,14 @@
 ;; #LAYOUT# *   BASIC_0 #TAKE
 ;; #LAYOUT# *   *       #IGNORE
 
-;
+
+; This file is under the MIT license, it contains code released by Microsoft Corporation.
+; See LICENSE for more information.
+
 ; Math package - move FAC1 (rounds) to memory variable
 ;
+; This is verified to be identical to the original Microsoft implementation where it was named MOVVF.
+;
 ; Input:
 ; - FORPNT ($49/$4A) - variable address
 ;
@@ -15,7 +20,7 @@
 
 mov_r_FAC1_VAR:
 
-	ldy #FORPNT+1
 	ldx #FORPNT+0
+	ldy #FORPNT+1
 
 	; FALLTROUGH to mov_r_FAC1_MEM