DOS ain't dead - I made my own DOS implementation

I made my own DOS implementation (Announce)

posted by roytam, 15.12.2025, 16:42
(edited by roytam on 15.12.2025, 16:54)

> Lots of progress has been made since I posted here last time. Nowadays the
> kernel can compile itself using the Open Watcom compiler and the DOS/32 DOS
> extender.
>
> The website now has a "Contribute" page, which also has a link to a set of
> guidelines of how to write userland programs. I will probably add more
> content to those pages in the near future.
>
> http://sininenankka.dy.fi/leetos/contribute.php
>
> The download page now has download counters. Only full file downloads are
> counted. Partial downloads don't increment the numbers.
>
> The utilities disk now includes also a FAT12/16 filesystem checker (CHKFAT)
> with its source code that also compiles on GCC. Currently it cannot fix any
> errors, but it is better at finding them than GNU fsck.msdos.

oh cool, but dostools.img is too broken that DOS 6.22 can't even read it.

EDIT: oh because the disk image has invalid BPB.

NDD log:
Disk Doctor Norton Utilities 2002 December 15, 2025 3:46pm ************************* * Report for Drive B: * ************************* DISK TOTALS ---------------------------------------- 1,457,664 bytes Total Disk Space 34,816 bytes in 1 User Files 13,824 bytes in 1 Hidden Files 512 bytes in bad sectors 1,408,512 bytes available on the disk LOGICAL DISK INFORMATION ---------------------------------------- Media Descriptor: F0 Large Partition: No FAT Type: 12-bit Total Sectors: 2,880 Total Clusters: 2,847 Bytes Per Sector: 512 Sectors Per Cluster: 1 Bytes Per Cluster: 512 Number of FATs: 2 First Sector of FAT: 1 Number of Sectors Per FAT: 9 First Sector of Root Dir: 19 Number of Sectors in Root Dir: 14 Maximum Root Dir File Entries: 224 First Sector of Data Area: 33 PHYSICAL DISK INFORMATION ---------------------------------------- Drive Number: 1 Heads: 2 Cylinders: 80 Sectors Per Track: 18 Starting Head: 0 Starting Cylinder: 0 Starting Sector: 1 Ending Head: 1 Ending Cylinder: 79 Ending Sector: 18 SYSTEM AREA STATUS ---------------------------------------- Boot Record program is invalid Status: Corrected Media descriptor byte is invalid. Status: Corrected The FAT copies are not the same. Status: Corrected FILE STRUCTURE STATUS ---------------------------------------- **************** Errors processing directories *************** Root Directory Invalid entries found; Corrected ************* Errors in Long File Name Structures ************ Root Directory has invalid long file names; Corrected 1 entries deleted. ************** Files with size allocation errors ************* \┼ox$.e$p Status: Size adjusted \║δ╢sueσi.$i Status: Size adjusted ********************* Invalid directories ******************** \UσA╥TXE╧.╤τσ Status: NOT Corrected ************************* Lost Chains ************************ Lost cluster chain at cluster 2 Status: Deleted Lost cluster chain at cluster 3 Status: Deleted Lost cluster chain at cluster 33 Status: Deleted Lost cluster chain at cluster 35 Status: Deleted Lost cluster chain at cluster 36 Status: Deleted Lost cluster chain at cluster 69 Status: Deleted Lost cluster chain at cluster 88 Status: Deleted Lost cluster chain at cluster 89 Status: Deleted Lost cluster chain at cluster 90 Status: Deleted Lost cluster chain at cluster 128 Status: Deleted Lost cluster chain at cluster 129 Status: Deleted Lost cluster chain at cluster 130 Status: Deleted Lost cluster chain at cluster 131 Status: Deleted Lost cluster chain at cluster 132 Status: Deleted Lost cluster chain at cluster 264 Status: Deleted Lost cluster chain at cluster 297 Status: Deleted Lost cluster chain at cluster 300 Status: Deleted Lost cluster chain at cluster 303 Status: Deleted Lost cluster chain at cluster 304 Status: Deleted Lost cluster chain at cluster 320 Status: Deleted Lost cluster chain at cluster 321 Status: Deleted Lost cluster chain at cluster 415 Status: Deleted Lost cluster chain at cluster 438 Status: Deleted Lost cluster chain at cluster 475 Status: Deleted Lost cluster chain at cluster 476 Status: Deleted Lost cluster chain at cluster 495 Status: Deleted Lost cluster chain at cluster 505 Status: Deleted Lost cluster chain at cluster 508 Status: Deleted Lost cluster chain at cluster 514 Status: Deleted Lost cluster chain at cluster 516 Status: Deleted Lost cluster chain at cluster 612 Status: Deleted Lost cluster chain at cluster 2,730 Status: Deleted Lost cluster chain at cluster 2,731 Status: Deleted Lost cluster chain at cluster 2,732 Status: Deleted Lost cluster chain at cluster 2,733 Status: Deleted Lost cluster chain at cluster 2,734 Status: Deleted Lost cluster chain at cluster 2,735 Status: Deleted Lost cluster chain at cluster 2,736 Status: Deleted Lost cluster chain at cluster 2,737 Status: Deleted Lost cluster chain at cluster 2,738 Status: Deleted Lost cluster chain at cluster 2,739 Status: Deleted Lost cluster chain at cluster 2,740 Status: Deleted Lost cluster chain at cluster 2,741 Status: Deleted Lost cluster chain at cluster 2,742 Status: Deleted Lost cluster chain at cluster 2,743 Status: Deleted Lost cluster chain at cluster 2,744 Status: Deleted Lost cluster chain at cluster 2,745 Status: Deleted Lost cluster chain at cluster 2,746 Status: Deleted Lost cluster chain at cluster 2,747 Status: Deleted Lost cluster chain at cluster 2,748 Status: Deleted Lost cluster chain at cluster 2,749 Status: Deleted Lost cluster chain at cluster 2,750 Status: Deleted Lost cluster chain at cluster 2,751 Status: Deleted Lost cluster chain at cluster 2,752 Status: Deleted Lost cluster chain at cluster 2,753 Status: Deleted Lost cluster chain at cluster 2,754 Status: Deleted Lost cluster chain at cluster 2,755 Status: Deleted Lost cluster chain at cluster 2,756 Status: Deleted Lost cluster chain at cluster 2,757 Status: Deleted Lost cluster chain at cluster 2,758 Status: Deleted Lost cluster chain at cluster 2,759 Status: Deleted Lost cluster chain at cluster 2,760 Status: Deleted Lost cluster chain at cluster 2,761 Status: Deleted Lost cluster chain at cluster 2,762 Status: Deleted Lost cluster chain at cluster 2,764 Status: Deleted Lost cluster chain at cluster 2,765 Status: Deleted Lost cluster chain at cluster 2,766 Status: Deleted Lost cluster chain at cluster 2,767 Status: Deleted Lost cluster chain at cluster 2,768 Status: Deleted Lost cluster chain at cluster 2,769 Status: Deleted Lost cluster chain at cluster 2,770 Status: Deleted Lost cluster chain at cluster 2,771 Status: Deleted Lost cluster chain at cluster 2,772 Status: Deleted Lost cluster chain at cluster 2,773 Status: Deleted Lost cluster chain at cluster 2,774 Status: Deleted Lost cluster chain at cluster 2,775 Status: Deleted Lost cluster chain at cluster 2,776 Status: Deleted Lost cluster chain at cluster 2,777 Status: Deleted Lost cluster chain at cluster 2,778 Status: Deleted Lost cluster chain at cluster 2,779 Status: Deleted Lost cluster chain at cluster 2,780 Status: Deleted Lost cluster chain at cluster 2,781 Status: Deleted Lost cluster chain at cluster 2,782 Status: Deleted Lost cluster chain at cluster 2,783 Status: Deleted Lost cluster chain at cluster 2,784 Status: Deleted Lost cluster chain at cluster 2,785 Status: Deleted Lost cluster chain at cluster 2,786 Status: Deleted Lost cluster chain at cluster 2,787 Status: Deleted Lost cluster chain at cluster 2,788 Status: Deleted Lost cluster chain at cluster 2,789 Status: Deleted Lost cluster chain at cluster 2,790 Status: Deleted Lost cluster chain at cluster 2,791 Status: Deleted Lost cluster chain at cluster 2,793 Status: Deleted Lost cluster chain at cluster 2,794 Status: Deleted Lost cluster chain at cluster 2,795 Status: Deleted Lost cluster chain at cluster 2,796 Status: Deleted Lost cluster chain at cluster 2,797 Status: Deleted Lost cluster chain at cluster 2,798 Status: Deleted Lost cluster chain at cluster 2,799 Status: Deleted Lost cluster chain at cluster 2,800 Status: Deleted Lost cluster chain at cluster 2,801 Status: Deleted Lost cluster chain at cluster 2,802 Status: Deleted Lost cluster chain at cluster 2,803 Status: Deleted Lost cluster chain at cluster 2,804 Status: Deleted Lost cluster chain at cluster 2,805 Status: Deleted Lost cluster chain at cluster 2,806 Status: Deleted Lost cluster chain at cluster 2,807 Status: Deleted Lost cluster chain at cluster 2,808 Status: Deleted Lost cluster chain at cluster 2,809 Status: Deleted Lost cluster chain at cluster 2,810 Status: Deleted Lost cluster chain at cluster 2,812 Status: Deleted Lost cluster chain at cluster 2,813 Status: Deleted Lost cluster chain at cluster 2,814 Status: Deleted Lost cluster chain at cluster 2,815 Status: Deleted Lost cluster chain at cluster 2,816 Status: Deleted Lost cluster chain at cluster 2,818 Status: Deleted Lost cluster chain at cluster 2,819 Status: Deleted Lost cluster chain at cluster 2,820 Status: Deleted Lost cluster chain at cluster 2,821 Status: Deleted Lost cluster chain at cluster 2,822 Status: Deleted Lost cluster chain at cluster 2,823 Status: Deleted Lost cluster chain at cluster 2,824 Status: Deleted Lost cluster chain at cluster 2,825 Status: Deleted Lost cluster chain at cluster 2,827 Status: Deleted Lost cluster chain at cluster 2,828 Status: Deleted Lost cluster chain at cluster 2,829 Status: Deleted Lost cluster chain at cluster 2,830 Status: Deleted Lost cluster chain at cluster 2,831 Status: Deleted Lost cluster chain at cluster 2,832 Status: Deleted Lost cluster chain at cluster 2,833 Status: Deleted Lost cluster chain at cluster 2,834 Status: Deleted Lost cluster chain at cluster 2,835 Status: Deleted Lost cluster chain at cluster 2,836 Status: Deleted Lost cluster chain at cluster 2,837 Status: Deleted Lost cluster chain at cluster 2,839 Status: Deleted Lost cluster chain at cluster 2,840 Status: Deleted Lost cluster chain at cluster 2,841 Status: Deleted Lost cluster chain at cluster 2,842 Status: Deleted Lost cluster chain at cluster 2,843 Status: Deleted Lost cluster chain at cluster 2,844 Status: Deleted Lost cluster chain at cluster 2,845 Status: Deleted Lost cluster chain at cluster 2,846 Status: Deleted Lost cluster chain at cluster 2,847 Status: Deleted Lost cluster chain at cluster 2,848 Status: Deleted SURFACE TEST STATUS ---------------------------------------- Surface Test not performed

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Complete thread:

I made my own DOS implementation - samwdpckr, 07.12.2023, 05:07 (Announce)
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  - I made my own DOS implementation - Zyzzle, 07.12.2023, 23:58
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        I made my own DOS implementation - nico7550, 28.12.2023, 08:31
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- I made my own DOS implementation - RayeR, 31.01.2024, 17:13
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    - I made my own DOS implementation - Japheth, 01.02.2024, 08:32
  - I made my own DOS implementation - samwdpckr, 01.02.2024, 15:36
    - I made my own DOS implementation - RayeR, 01.02.2024, 19:01
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        I made my own DOS implementation - KormaX, 02.02.2024, 11:11
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- I made my own DOS implementation - samwdpckr, 12.03.2024, 22:56
  - I made my own DOS implementation - fritz.mueller, 15.03.2024, 14:49
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      - I made my own DOS implementation - fritz.mueller, 16.03.2024, 20:01
        I made my own DOS implementation - samwdpckr, 16.03.2024, 23:11
        I made my own DOS implementation - samwdpckr, 18.03.2024, 01:52
        I made my own DOS implementation - fritz.mueller, 18.03.2024, 13:25
        I made my own DOS implementation - samwdpckr, 18.03.2024, 22:22
        I made my own DOS implementation - fritz.mueller, 20.03.2024, 15:56
        I made my own DOS implementation - samwdpckr, 21.03.2024, 18:06
        I made my own DOS implementation - tom, 21.03.2024, 19:32
        I made my own DOS implementation - samwdpckr, 21.03.2024, 19:56
        I made my own DOS implementation - fritz.mueller, 21.03.2024, 22:14
        I made my own DOS implementation - samwdpckr, 21.03.2024, 22:21
        I made my own DOS implementation - ecm, 22.03.2024, 00:21
        I made my own DOS implementation - samwdpckr, 22.03.2024, 02:06
        I made my own DOS implementation - ecm, 22.03.2024, 07:31
        I made my own DOS implementation - tom, 22.03.2024, 10:58
        I made my own DOS implementation - tom, 22.03.2024, 11:22
        I made my own DOS implementation - samwdpckr, 22.03.2024, 13:14
        I made my own DOS implementation - tom, 22.03.2024, 14:12
        I made my own DOS implementation - samwdpckr, 22.03.2024, 16:21
        I made my own DOS implementation - tom, 22.03.2024, 17:32
        I made my own DOS implementation - samwdpckr, 23.03.2024, 08:10
        I made my own DOS implementation - ecm, 23.03.2024, 09:58
        I made my own DOS implementation - tom, 23.03.2024, 12:20
        I made my own DOS implementation - samwdpckr, 23.03.2024, 20:32
        I made my own DOS implementation - samwdpckr, 26.03.2024, 04:36
        I made my own DOS implementation - samwdpckr, 27.03.2024, 23:29
        I made my own DOS implementation - Rugxulo, 28.03.2024, 01:29
        I made my own DOS implementation - samwdpckr, 28.03.2024, 04:15
        I made my own DOS implementation - fritz.mueller, 28.03.2024, 21:19
        I made my own DOS implementation - samwdpckr, 29.03.2024, 18:00
        I made my own DOS implementation - Rugxulo, 29.03.2024, 22:01
        I made my own DOS implementation - samwdpckr, 29.03.2024, 22:31
        I made my own DOS implementation - Rugxulo, 08.04.2024, 03:19
        I made my own DOS implementation - fritz.mueller, 17.05.2024, 12:49
        I made my own DOS implementation - Rugxulo, 29.03.2024, 02:53
        I made my own DOS implementation - Rugxulo, 30.03.2024, 10:16
        I made my own DOS implementation - samwdpckr, 30.03.2024, 20:09
        I made my own DOS implementation - Oso2k, 31.03.2024, 21:22
        I made my own DOS implementation - Rugxulo, 31.03.2024, 22:59
        I made my own DOS implementation - samwdpckr, 01.04.2024, 16:31
        I made my own DOS implementation - samwdpckr, 08.09.2024, 01:32
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        I made my own DOS implementation - samwdpckr, 15.12.2025, 06:29
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        I made my own DOS implementation - samwdpckr, 16.12.2025, 03:34
        I made my own DOS implementation - Japheth, 16.12.2025, 09:20
        I made my own DOS implementation - roytam, 16.12.2025, 10:26
        I made my own DOS implementation - Japheth, 16.12.2025, 12:25
        I made my own DOS implementation - samwdpckr, 16.12.2025, 13:29
        I made my own DOS implementation - Japheth, 17.12.2025, 16:34
        I made my own DOS implementation - bretjohn, 17.12.2025, 21:47
        I made my own DOS implementation - samwdpckr, 17.12.2025, 23:53