DOS ain't dead

LZ-DOS 7.1 (Miscellaneous)

posted by sol, 20.11.2007, 19:04

http://www.old-computers.com/museum/computer.asp?st=1&c=615
> OK, even if it is a product of real company it may be 99% based on
> reversed code. I think it was not so unusual in communist and
> post-communists countries (e.g. our n.p. Slusovice).
> BTW I still didn't get answer if it have some advanded features over
> MSDOS.

It doesn't have new features, and it's not "based on reversed code". Apparently no one's really understood what I've shown here :)

If someone reverse engineered IO.SYS, they would then have to assemble it themselves. Unless they reverse engineered it perfectly (pretty much impossible), and ended up choosing the same assembler to use and the exact same options to assemble with (unlikely), the code would be different.

If I changed anything, the code would be different. Even if I changed a single byte, the the jump addresses around it would have all changed.

The only way this could have been done, would have been to take the original MS-DOS 7.10 IO.SYS, use a hex editor to remove copyright strings and then manually compress data and add decompression code.

This means that it's more likely to be unstable (probably why I can't get it to boot on a hard disk instead of a floppy), and it's also a little *wee* bit slower.

Even if it had been reverse engineered code, it would be just as illegal. If anyone were good enough to code their own kernel, they wouldn't need to steal a chunk of loader code anyway.

There is *no chance* the LZ-DOS kernel is not a hacked MS-DOS 7.10 kernel. There's no chance it's an independent project or even a reverse engineered & reassembled version. Just to make sure we're clear here.

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