Hello Mr. Phil Mony,
A lot of times seeing values like #0FH and #00FH can confuse you. I have found if you compile the questionable portion program (A51 ANATEST.ASM) you can look at the results in ANATEST.LST and it will eliminate the confusions.
I saved the below two lines to a file called "ANATEST.ASM" and complied with a public domain program A51.EXT and it produced the bottom two lines as a results that were contained in a file called ANATEST.LST. Hope this eliminates the confusion and teaches you how to deal with these pesky problems in the future. Good luck.
Regards,
Charles Bannister
----------------------------- FILE ANATEST.ASM ----------------
ANL A, #0FH
ANL A, #00FH
----------------------------- FILE ANATEST.LST ----------------
000001 0000 540F ANL A, #0FH
000002 0002 540F ANL A, #00FH