China DOS Union

What's going on here? I'm just a beginner, how to solve it? Hope the experts can give instructions! The source code is as follows, a very simple one

data segment
x db 1
data ends
code segment
assume cs:code,ds:data
start:mov ax,data
mov ds,ax
mov dl,x
add dl,30h
mov ah,2h
int 21h
mov ah,4ch
int 21h
code ends
end start

Save this program as a text file named a.asm. Then go to compile and link. Remember that you have raised a similar question in this forum before. Don't make the same mistake in the same place!

I just put the a.asm file in the masm folder and then it was compiled. Thanks very much. But ask, the a.exe I generated is not running properly. I want to look at it in debug. According to the book, I input debug a.exe in the command prompt, but it says file not found. Please give me some advice!! Thanks a lot!!

First, switch the path to the directory of A.EXE 44. For long pathnames with spaces, etc., use "" to enclose them.

Just enter the path of a.exe just now, thank you very much