Ultra Newb question

Using debug.exe in XP, I'm trying to assembly the following but keep
getting garbage after the entered key...

mov ah,09
mov dx,200
int 21
mov ah,01
int 21
mov bl,al
mov ah,09
mov dx,220
int 21
mov ah,02
mov dl,bl
int 21
int 20

I have two strings in memory...

e 200
50 72 65 73 73 20 61 20 62 75 74 74 6f 6e 3a 24

e 230
0d 0a 59 6f 75 20 70 72 65 73 73 65 64 20 24

Debug is saying the program terminates normally and tracing through I
can't find anything abnormal that could be causing this. Any help and
suggestions will be much appreciated!

.

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