Update div_MEM_FAC1

STATUS.md

@@ -226,7 +226,7 @@ Floating point mathematical routines - not official, but well known and broadly
 | `$BAE2`   | `mul10_FAC1`           | DONE     | From the Microsoft BASIC, original name: MUL10     |
 | `$BAFE`   | `div10_FAC1_p`         | DONE     | From the Microsoft BASIC, original name: DIV10     |
 | `$BB07`   | `div_FAC2_MEM`         | DONE     | From the Microsoft BASIC, original name: FDIVF     |
-| `$BB0F`   | `div_MEM_FAC1`         | DONE     |                                                    |
+| `$BB0F`   | `div_MEM_FAC1`         | DONE     | From the Microsoft BASIC, original name: FDIV      |
 | `$BB12`   | `div_FAC2_FAC1`        | DONE     |                                                    |
 | `$BB8F`   | `mov_RES_FAC1`         | DONE     | From the Microsoft BASIC, original name: MOVFR     |
 | `$BBA2`   | `mov_MEM_FAC1`         | DONE     | From the Microsoft BASIC, original name: MOVFM     |

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

tools/similarity.c

@@ -27,7 +27,7 @@ unsigned short microsoft_basic_chunks[NUM_CHUNKS * 2] = {
     0xB3A2, 0xB3A5,
     0xB849, 0xB97D,
     0xB983, 0xB9BB,
-    0xBA28, 0xBB0E,
+    0xBA28, 0xBB11,
     0xBB8F, 0xBCF2,
 };