Add convert_u8_A_to_FAC1

src/basic/math/b794.convert_A_to_FAC1.s

@@ -0,0 +1,14 @@
+;; #LAYOUT# STD *       #TAKE
+;; #LAYOUT# X16 BASIC_0 #TAKE-OFFSET 2000
+;; #LAYOUT# *   BASIC_0 #TAKE
+;; #LAYOUT# *   *       #IGNORE
+
+;
+; Math package - Convert A (uint8) to FAC1
+;
+; - https://sta.c64.org/cbm64basconv.html
+;
+
+convert_u8_A_to_FAC1:
+    tay
+    jmp convert_Y_to_FAC1

src/basic/math/b794.interop

@@ -0,0 +1,3 @@
+This is an important floating point math routine, documented in many places.
+
+XXX - try to find real-life example