more sane directory name, updated binaries

src/basic/math/bae2.mul10_FAC1.s

@@ -0,0 +1,41 @@
+// #LAYOUT# STD *       #TAKE
+// #LAYOUT# X16 BASIC_0 #TAKE-OFFSET 2000
+// #LAYOUT# *   BASIC_0 #TAKE
+// #LAYOUT# *   *       #IGNORE
+
+//
+// Math package - multiply FAC1 by 10
+//
+// See also:
+// - [CM64] Computes Mapping the Commodore 64 - page 114
+// - https://www.c64-wiki.com/wiki/Floating_point_arithmetic
+// - https://codebase64.org/doku.php?id=base:kernal_floating_point_mathematics
+//
+
+mul10_FAC1:
+
+	// Handle special case of FAC1 equal 0
+
+	lda FAC1_exponent
+	beq mul10_FAC1_done
+
+	// Start by multiplying FAC1 by 2
+
+	jsr mul10_FAC1_mul2
+
+	// Move FAC1 to FAC2, so that FAC1 = FAC2 = 2 * initial
+
+	jsr mov_FAC1_FAC2
+
+	// Multiply FAC1 by 4
+
+	jsr mul10_FAC1_mul2
+	jsr mul10_FAC1_mul2
+
+	// Now we have FAC1 = 8 * initial and FAC2 = 2 * initial; so just add these 2 values
+
+	jmp add_FAC2_FAC1
+
+mul10_FAC1_done:
+
+	rts