Smallest DOS hello world? ASCII CODE

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Alphonso

Joined: 16 Jan 2007
Posts: 294

Alphonso

Ok, found this link. executable ascii. Seems like bitRAKE should know all about it Very Happy

It's a shame it's been put to bad use.

13 Dec 2009, 10:46

Dex4u

Joined: 08 Feb 2005
Posts: 1601
Location: web

Dex4u

I wrote a txt2com for DexOS you can see code here, it will convert to dos very easy .
http://dex.7.forumer.com/viewtopic.php?t=417&highlight=txt2com

14 Dec 2009, 19:10

rugxulo

Joined: 09 Aug 2005
Posts: 2341
Location: Usono (aka, USA)

rugxulo

CWS (of CWSDPMI) recently mentioned using some self-executing ASCII in his configure.com for VMS (now renamed to configure.vms). With help from this thread (esp. the table made by windwakr), I hacked this up (purely 7-bit):

EDIT: Now with source (if you didn't feel like disassembling it)!

Code:

; hY1X-00P[h:!_)?)?CC)?)?h]1X-00PZh09X-00AdAc!DOS is not VMS!$

; CRC32 (w/ CR+LF):  836E89E7
; using FASM from http://board.flatassembler.net
; rugxulo _AT_ gmail _DOT_ com
; public domain, nenies proprajxo, Christus Rex!

; cpu 186
org 100h
magic equ ':!'

;and al,20h        ; dw '$ '
cmp sp,[bx+si]     ; dw '; '
push doscall+'00'
pop ax
sub ax,'00'
push ax
pop bx
push magic
pop di
sub [bx],di
sub [bx],di
inc bx
inc bx
sub [bx],di
sub [bx],di
push msg+'00'
pop ax
sub ax,'00'
push ax
pop dx
push '09'
pop ax
sub ax,'00'
doscall dw (021CDh+magic*2) and 0FFFFh, (020CDh+magic*2) and 0FFFFh
msg db '!DOS is not VMS!'
msg_end db '$'     ; do not change!
linefeed db 13,10  ; to please nitpicky text editors

11 Apr 2010, 06:17

bttr

Joined: 21 Oct 2003
Posts: 16
Location: Berlin, Germany

bttr

Old thread, but you might be interested in CM3 by Laura Fairhead: http://lf.8k.com/TOOLS/TOOLS.HTM

11 Sep 2010, 20:15

prino

Joined: 24 Jun 2004
Posts: 17

prino

http://groups.google.com/group/alt.lang.asm/browse_frm/thread/a275cf59c1d8030a/e56bed2aa7689eb1?hl=en&q=#e56bed2aa7689eb1

or this - see http://www.google.com/search?q=ptt007.zip

VZNNXPH555750K4PP5DM3D01D0X5AC3D21D2XP559550K4

save as ASCII.COM

As debug source:

Code:

NASCII.COM
A100
PUSH SI
POP  DX
DEC  SI
DEC  SI
POP  AX
PUSH AX
DEC  AX
XOR  AX,3535
AAA
XOR  AX,4B30
XOR  AL,50
PUSH AX
XOR  AX,4D44
XOR  AX,[SI+30]
XOR  [SI+30],AX
POP  AX
XOR  AX,4341
XOR  AX,[SI+32]
XOR  [SI+32],AX
POP  AX
PUSH AX
XOR  AX,3935
XOR  AX,3035
DEC  BX
DB   34

RCX
2E
W
Q

11 Sep 2010, 21:21

DVicthor

Joined: 13 Sep 2013
Posts: 3
Location: Nigeria

DVicthor

Instead of adding 100h to the offset of .msg, you can just ORG 100h and the corrections will be made.

16 Sep 2013, 21:41

DOS386

Joined: 08 Dec 2006
Posts: 1901

DOS386

See also : http://board.flatassembler.net/topic.php?t=15272 (ASCII code)

http://board.flatassembler.net/topic.php?t=15169 "Tiniest Example Ever"

22 Sep 2013, 18:46

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