DOS ain't dead - LZ-DOS 7.1

LZ-DOS 7.1 (Miscellaneous)

posted by sol, 19.11.2007, 21:32

> Good luck! But please provide enough evidence to prove that you really did
> it.

I did part of it :)

If you pop it into HIEW or QVIEW, you'll see at 0x202 within the "LZ-DOS" IO.SYS:

inc dx
dec dx
jmp 0x704

<big chunk of crap code>

0x704:

cli
mov ax, cs
mov es, ax
mov ax, si
mov dx, di
mov di, 0202h
mov si, 0205h
mov cx, 04FFh
0x716:
xor byte ptr cs:[si],cl
movsb es:[di],cs:[si]
loop 0x716
mov si, ax
mov di, dx
sti
jmp 0x202 ; 0x202 is where the unobfuscated code is now

Thread locked

Complete thread:

LZ-DOS 7.1 & booting previous DOS version - RayeR, 19.11.2007, 10:43 (Miscellaneous)
- LZ-DOS 7.1 & booting previous DOS version - sol, 19.11.2007, 17:56
  - LZ-DOS 7.1 & booting previous DOS version - sol, 19.11.2007, 17:59
    - LZ-DOS 7.1 - lucho, 19.11.2007, 19:05
      - LZ-DOS 7.1 - Steve, 19.11.2007, 19:36
        LZ-DOS 7.1 - lucho, 19.11.2007, 20:11
        LZ-DOS 7.1 - Steve, 20.11.2007, 18:29
        Canadian - lucho, 20.11.2007, 19:20
        Canadian - sol, 20.11.2007, 19:43
        Canadian - Steve, 21.11.2007, 02:11
        Canadian - Steve, 21.11.2007, 02:09
      - LZ-DOS 7.1 - sol, 19.11.2007, 20:06
        LZ-DOS 7.1 - lucho, 19.11.2007, 20:24
        LZ-DOS 7.1 - sol, 19.11.2007, 20:26
        LZ-DOS 7.1 - lucho, 19.11.2007, 20:38
        LZ-DOS 7.1 - sol, 19.11.2007, 20:45
        LZ-DOS 7.1 - lucho, 19.11.2007, 20:49
        LZ-DOS 7.1 - sol, 19.11.2007, 21:32
        LZ-DOS 7.1 - sol, 19.11.2007, 21:39
        LZ-DOS 7.1 - sol, 19.11.2007, 21:55
        LZ-DOS 7.1 - sol, 19.11.2007, 21:58
        LZ-DOS 7.1 - sol, 19.11.2007, 22:00
        LZ-DOS 7.1 - lucho, 20.11.2007, 07:35
        LZ-DOS 7.1 - sol, 20.11.2007, 08:13
        LZ-DOS 7.1 - lucho, 20.11.2007, 09:43
        LZ-DOS 7.1 - RayeR, 20.11.2007, 12:52
        LZ-DOS 7.1 - lucho, 20.11.2007, 13:25
        LZ-DOS 7.1 - RayeR, 20.11.2007, 14:51
        LZ-DOS 7.1 - lucho, 20.11.2007, 15:28
        LZ-DOS 7.1 - RayeR, 20.11.2007, 18:15
        LZ-DOS 7.1 - sol, 20.11.2007, 19:04
        LZ-DOS 7.1 - sol, 20.11.2007, 19:09
        SOL comes from StoOL-pigeon - lucho, 20.11.2007, 19:54
        SOL comes from StoOL-pigeon - sol, 20.11.2007, 20:22
        "Forking" is much worse than copying - lucho, 21.11.2007, 11:00
        LZ-DOS 7.1 - lucho, 20.11.2007, 19:30
        LZ-DOS 7.1 - sol, 20.11.2007, 19:34
        LZ-DOS 7.1 - RayeR, 20.11.2007, 19:51
        LZ-DOS 7.1 - sol, 21.11.2007, 00:36
        LZ-DOS 7.1 - lucho, 21.11.2007, 10:32
        LZ-DOS 7.1 *IS* MSDOS 7.1 - tom, 22.11.2007, 12:39
        LZ-DOS 7.1 - Rugxulo, 22.11.2007, 16:58
        LZ-DOS 7.1 - rr, 22.11.2007, 21:28
        LZ-DOS 7.1 - rr, 20.11.2007, 10:58
        LZ-DOS 7.1 - lucho, 20.11.2007, 12:45
      - LZ-DOS 7.1 - sol, 19.11.2007, 20:10
        LZ-DOS 7.1 - lucho, 19.11.2007, 20:33
        LZ-DOS 7.1 - sol, 19.11.2007, 20:37
        LZ-DOS 7.1 - lucho, 19.11.2007, 20:46
        LZ-DOS 7.1 - Rugxulo, 20.11.2007, 00:07
        About the Best Kept Top Secret of this forum, again - lucho, 20.11.2007, 07:46
        I apologize. - Japheth, 20.11.2007, 12:01
        I apologize. - lucho, 20.11.2007, 12:49
        anger shortens one's life - Rugxulo, 21.11.2007, 09:28
        anger shortens one's life - lucho, 21.11.2007, 10:03
        anger shortens one's life - Japheth, 21.11.2007, 10:09
        About the Best Kept Top Secret of this forum, again - Rugxulo, 21.11.2007, 09:25
        About the Best Kept Top Secret of this forum, again - lucho, 21.11.2007, 12:10
        About the Best Kept Top Secret of this forum, again - Steve, 21.11.2007, 12:32
        About the Best Kept Top Secret of this forum, again - lucho, 21.11.2007, 12:38
        About the Best Kept Top Secret of this forum, again - Steve, 21.11.2007, 13:17
        About the Best Kept Top Secret of this forum, again - lucho, 21.11.2007, 13:22
        About the Best Kept Top Secret of this forum, again - Rugxulo, 21.11.2007, 12:46
        Useless to argue - Japheth, 21.11.2007, 13:11
        Useless to argue - lucho, 21.11.2007, 13:17
        About the Best Kept Top Secret of this forum, again - lucho, 21.11.2007, 13:12
        About the Best Kept Top Secret of this forum, again - sol, 21.11.2007, 16:29
        Pravetz-16, etc. - lucho, 21.11.2007, 18:20
        Pravetz-16, etc. - RayeR, 21.11.2007, 18:45
        1980s - lucho, 21.11.2007, 19:11
        1980s - RayeR, 22.11.2007, 00:58
        Pravetz-16, etc. - Steve, 22.11.2007, 05:35
        Saul Hudson -- nice guy - Rugxulo, 21.11.2007, 13:02
        Book author? - lucho, 21.11.2007, 13:26
        Book author? - Rugxulo, 22.11.2007, 14:59
  - LZ-DOS 7.1 & booting previous DOS version - Japheth, 19.11.2007, 22:41
    - LZ-DOS 7.1 - lucho, 20.11.2007, 08:06
      - LZ-DOS 7.1 - Japheth, 20.11.2007, 08:57
        The pot calls the kettle black - lucho, 20.11.2007, 09:26
        The pot calls the kettle black - Japheth, 20.11.2007, 10:22
        The pot calls the kettle black - lucho, 20.11.2007, 13:18
        "Five of Good" - agreed - Japheth, 20.11.2007, 14:05
        The pot calls the kettle black - Rugxulo, 21.11.2007, 09:43
        Depression - lucho, 21.11.2007, 10:18
        The pot calls the kettle black - Japheth, 21.11.2007, 10:19
        The pot calls the kettle black - lucho, 21.11.2007, 10:25
        The pot calls the kettle black - Japheth, 21.11.2007, 10:42
        Udo confirmed it was you - lucho, 21.11.2007, 11:05
        The FOG is speaking - Japheth, 21.11.2007, 12:43
        The FOG is speaking - Steve, 21.11.2007, 13:28
        Five of Good vs. Gang of Four - lucho, 21.11.2007, 13:42
        2 innocent questions - Japheth, 21.11.2007, 14:05
        2 innocent questions - lucho, 21.11.2007, 14:44
        2 innocent questions - Steve, 21.11.2007, 14:56
        2 innocent questions - lucho, 21.11.2007, 15:34
        None selected - Japheth, 21.11.2007, 17:45
        None selected - Steve, 21.11.2007, 17:58
        ... the game must go on ... - Japheth, 21.11.2007, 15:38
        ... the game must go on ... - Matjaz, 21.11.2007, 19:14
        A small riddle - Japheth, 21.11.2007, 19:39
        Farewell! - lucho, 21.11.2007, 20:06
        Failed! - Japheth, 21.11.2007, 20:30
        A small riddle - Matjaz, 21.11.2007, 20:19
        Solved! - Japheth, 21.11.2007, 20:26
        Solved! - Matjaz, 21.11.2007, 20:37
        Solved! - Japheth, 21.11.2007, 22:07
        Solved?? - Rugxulo, 22.11.2007, 14:56
        a one man play ... no, not about my hooha - Rugxulo, 21.11.2007, 10:51
- LZ-DOS 7.1 & booting previous DOS version - rr, 20.11.2007, 11:24
  - LZ-DOS 7.1 & booting previous DOS version - RayeR, 20.11.2007, 12:07
    - LZ-DOS 7.1 & booting previous DOS version - lucho, 20.11.2007, 13:27
      - LZ-DOS 7.1 & booting previous DOS version - Rugxulo, 21.11.2007, 09:15
        Boot managers, Vista - lucho, 21.11.2007, 09:40
        Boot managers, Vista - Rugxulo, 21.11.2007, 09:57
        METAKERN by Eric Auer - lucho, 21.11.2007, 12:46
        OS boot managers -- comparison requested - Rugxulo, 21.11.2007, 12:57
        OS boot managers -- comparison requested - lucho, 21.11.2007, 13:32