Update div_MEM_FAC1

src/basic/math/bb0f.div_MEM_FAC1.s

@@ -3,9 +3,13 @@
 ;; #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 - divide RAM by FAC1
 ;
+; This is verified to be identical to the original Microsoft implementation where it was named FDIV.
+;
 ; Input:
 ; - .A - address low byte
 ; - .Y - address high byte