even the chinese is so many and great ,you are not very appropriate to sell 'WQX' here,I almost be joked to death seeing your notes,with the words of 'LiuXiang" I can't believe it ,I can't believe it too much.

firstly thank you all.
basically,I know the difference of "64.." and "9c..." that generated from "STZ", and then that is my point I don't understand. "STZ YEAR" there should be correspondant to "64.."not "9c.."and so I think it is my assembler's fault.
The assembler i am making use, i think, may ...

I am confused when i use "stz" to clear memory that located in zero page in w65c02s instruction sets.
first I defined
year equ e4h
then .......
stz year
the confusion appeared.after compiled,the instruction opcode is "9c e5 00" rather than "64 e5"that i think reasonable.So when the program runs ...