diff --git a/wip-hugo/macros/16aritmatic.s b/wip-hugo/macros/16aritmatic.s
index 46eb0be..ed2cba5 100755
--- a/wip-hugo/macros/16aritmatic.s
+++ b/wip-hugo/macros/16aritmatic.s
@@ -7,21 +7,27 @@
 ;; IF to run it fast
 .ifblank fast_unsafe
     CLC
-.endif
-;; If b_low != A
-.if .match(.mid (0, 1, {b_low}), A )
-.else
-    LDA b_low
 .endif
 	LDA b_low
 	ADC a_low
 	STA a_low
 	LDA b_hi
-    LDA b_hi
 	ADC a_hi
 	STA a_hi
 .endmacro
 
+; Untested!
+.macro Add_16_AX low, hi, fast_unsafe; , A, X
+;; IF to run it fast
+.ifblank fast_unsafe
+    CLC
+.endif
+	ADC low
+	STA low
+	TXA
+	ADC hi
+	STA hi
+.endmacro
 
 .macro Sub_16 a_low, a_hi, b_low, b_hi, fast_unsafe ; a = a - b
 .ifblank fast_unsafe
@@ -35,6 +41,19 @@
     STA a_hi
 .endmacro
 
+;;Untested
+.macro Sub_16_AX low, hi, fast_unsafe; , A, X
+;; IF to run it fast
+.ifblank fast_unsafe
+    SEC
+.endif
+	SBC low
+	STA low
+	TXA
+	SBC hi
+	STA hi
+.endmacro
+
 .macro mult_16 low_, hi_, fast_unsafe  ; [low, hi] = [low, hi]*2
 ;; IF to run it fast
 .ifblank fast_unsafe