more sane directory name, updated binaries

src/basic/math/b853.sub_FAC2_FAC1.s

@@ -0,0 +1,25 @@
+// #LAYOUT# STD *       #TAKE
+// #LAYOUT# X16 BASIC_0 #TAKE-OFFSET 2000
+// #LAYOUT# *   BASIC_0 #TAKE
+// #LAYOUT# *   *       #IGNORE
+
+//
+// Math package - subtract FAC1 from FAC2
+//
+// See also:
+// - [CM64] Computes Mapping the Commodore 64 - page 112
+// - https://www.c64-wiki.com/wiki/Floating_point_arithmetic
+// - https://codebase64.org/doku.php?id=base:kernal_floating_point_mathematics
+//
+
+// XXX test this
+
+sub_FAC2_FAC1:
+
+	// Toggle FAC1 sign
+	lda FAC1_sign
+	eor #$FF
+	sta FAC1_sign
+
+	// Perform addition
+	jmp add_FAC2_FAC1