diff --git a/test-programs/add-sub.asm b/test-programs/add-sub.asm
new file mode 100644
index 0000000..2052728
--- /dev/null
+++ b/test-programs/add-sub.asm
@@ -0,0 +1,18 @@
+;; test addition and substraction
+;  with direct addressing...
+LDA $FE
+ADD $01 ; $FF
+ADD $01 ; $00 + CF=1
+ADD $01 ; $01 + CF=0
+SUB $01 ; $00 + CF=0
+SUB $01 ; $FF + CF=1
+;  and with indirect...
+LDA $01
+STO $00
+LDA $FE
+ADD ($00) ; $FF
+ADD ($00) ; $00 + CF=1
+ADD ($00) ; $01 + CF=0
+SUB ($00) ; $00 + CF=0
+SUB ($00) ; $00 + CF=1
+END
\ No newline at end of file