implemented 2 more simple math routines

c64/basic/,stubs_math/bbd4.MOVMF2.s

@@ -14,12 +14,11 @@
 // - .A - FAC1 exponent
 //
 // 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
 //
 
 // XXX provide implementation
 
-MOVFM:
+MOVFM2:
 	STUB_IMPLEMENTATION()

c64/basic/,stubs_math/bc0f.MOVFA.s

@@ -1,17 +0,0 @@
-// #LAYOUT# STD *       #TAKE
-// #LAYOUT# *   BASIC_0 #TAKE
-// #LAYOUT# *   *       #IGNORE
-
-//
-// Math package - copy FAC1 to FAC2, skips rounding
-//
-// See also:
-// - [CM64] Computes Mapping the Commodore 64 - page 115
-// - https://www.c64-wiki.com/wiki/Floating_point_arithmetic
-// - https://codebase64.org/doku.php?id=base:kernal_floating_point_mathematics
-//
-
-// XXX provide implementation
-
-MOVFA:
-	STUB_IMPLEMENTATION()

c64/basic/,stubs_math/bc0f.interop

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