INT 21h, function 4Fh produces Segmentation fault \ VOGONS

INT 21h, function 4Fh produces Segmentation fault

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First post, by trepan

Posted on 2005-06-08, 19:39

trepan Offline

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Rank: Newbie
Posts: 2
Joined: 2005-06-08, 19:29

I made a program in NASM.
It crashes.
Code :

1BITS 16
2ORG 0x100
3SECTION .text
4	; Lets do DTA
5	mov	ah,0x1a
6	mov	dx,buf
7	int	0x21
8	; Find a COM file
9	mov	ah,0x4f
10	xor	cx,cx
11	mov	dx,fname
12	int	0x21 ** we crash here
13	; Did we find it ...
14	cmp	ax,0x0
15	je	end

1fname	db	'c:\*.com',0
2buf	db	'                                                    '

DosBOX 0.63 [Core:simple and full] Running FreeBSD/4.10 XFree 4.x ; Sound disabled; RAM : 256MB [system] 4;8;16;32 [Dosbox]

Reply 1 of 2, by Qbix

Posted on 2005-06-08, 20:14

Qbix Offline

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Rank: DOSBox Author
Posts: 11324
Joined: 2002-11-27, 14:50
Location: Fryslan

yes
you must use 4e first to initilase the dta. (and get the first result)

while this crash has actually been fixed in the cvs. you will not find a file.
if you only use 4f

Water flows down the stream
How to ask questions the smart way!

Reply 2 of 2, by trepan

Posted on 2005-06-08, 22:35

trepan Offline

Rank Newbie

Rank: Newbie
Posts: 2
Joined: 2005-06-08, 19:29

Stupid me 😊

I made just a typo 😜

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