Change current directory to the root and display it

Question

I tried to use interrupt 3bh/21h for change directory to the root and display it, but that doesn't work. I copy program to c:/folder and execute it.

.model  tiny

ORG 100h  
.DATA


root db "\",0
buf DB   64 dup('$') 

.CODE
 start:
mov ax, @data
mov ds, ax



mov ah,3bh
mov dx,offset root
int 21h

mov ah,47h
mov si,offset buf   
mov dl,0       
int 21h         

mov ah,9        
mov dx,offset buf   
int 21h


mov ax,4c00h
int 21h
end start

A good place to start would be to add some error checking. All those disk interrupts you're using return error codes if they fail. — Michael, Jun 05 '14 at 10:41

score 0 · Accepted Answer · answered Jun 05 '14 at 11:24

0

It displays nothing because the root path has no pathname. Try it with a subdirectory e.g. "\tmp" (or something existing). Caution: You must use 8.3-pathnames.

BTW: Your combination

.model  tiny

ORG 100h  
.DATA
...
.CODE
...

is wrong.

answered Jun 05 '14 at 11:24

rkhb

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Again thanks. Whether I just wanted to check the catalog changes. – lifetowin Jun 05 '14 at 11:50
Try to check the carry flag(CF set on error/CF clear if successful) if the is an error. – Dirk Wolfgang Glomp Jun 05 '14 at 14:57

Change current directory to the root and display it

1 Answers1