66 lines
3.3 KiB
Markdown
66 lines
3.3 KiB
Markdown
# 86-DOS 0.11 Source Code Reconstruction
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Full source code reconstruction of 86-DOS 0.11 - the earliest released version
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of the earliest operating system for the Intel x86 architecture.
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> [!IMPORTANT]
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> All 8086 assembly language source files in this repository use the extension
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`.A86`, because 86-DOS was originally assembled using the SCP Z80/8086 Cross
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Assembler running under Cromemco CDOS. To build 86-DOS under 86-DOS itself or
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MS-DOS, you would have to rename all `.A86` files to `.ASM`.
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## Progress
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<img src="./.progress/boot.svg"> <img src="./.progress/bios.svg">
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<img src="./.progress/kernel.svg"> <img src="./.progress/asm.svg">
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<img src="./.progress/chess.svg"> <img src="./.progress/command.svg">
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<img src="./.progress/edlin.svg"> <img src="./.progress/hex2bin.svg">
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<img src="./.progress/rdcpm.svg"> <img src="./.progress/sys.svg">
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<img src="./.progress/trans.svg">
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## Author
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This software was written by [@TimPaterson](https://github.com/TimPaterson) in
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1980. The reconstructed source code in this repository compiles back to the
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exact same binaries shipped by Seattle Computer Products. Therefore, it can be
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fully regrded as Paterson's work.
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> [!IMPORTANT]
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> Please do not file feature requests or make pull requests to fix bugs in the
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code. This is not my OS and I want this important piece of digital computing
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history to be preserved in its most original state. I will not accept anything
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that alters the assembled binaries in any way, shape or form.
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## Disclaimer
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This source code reconstruction is a product of reverse engineering. It is
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important to note that Microsoft Corporation has not released the source code
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for this specific version of DOS, and its legality may be in a gray area.
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The source code reconstruction was undertaken with the understanding that
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Microsoft Corporation has open-sourced later versions of this operating system
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under the name MS-DOS, under the MIT License. The intention behind this source
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code reconstruction project is purely for historical and educational purposes,
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with a focus on preserving the heritage of early computing.
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While efforts have been made to ensure compliance with applicable laws and
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regulations, the legal status of this source code reconstruction project may
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not be entirely clear. Users are advised to exercise caution and seek legal
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advice before using or redistributing any code extracted from this repository.
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This project acknowledges the intellectual property rights of Microsoft
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Corporation and does not seek to infringe upon any proprietary rights. The
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reconstructed source code is shared in the spirit of historical preservation,
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education, and appreciation for this wonderful operating system.
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By accessing and using the reconstructed source code provided in this
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repository, you agree to do so at your own risk and assume all responsibility
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for any legal implications that may arise.
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## Building
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*See [Building 86-DOS 0.11](./Building.md).*
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## Special Thanks
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* [@TimPaterson](https://github.com/TimPaterson) - For writing this amazing OS
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and providing the source code of 86-DOS 1.00.
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* [@geneb](https://github.com/geneb) - For providing a copy of 86-DOS 0.11.
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* [@RichCini](https://github.com/RichCini) - For figuring out some
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hard-to-decipher logic and for testing and debugging the reconstructed
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Tarbell-specific code on physical hardware.
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