RUruk_booze·Dec 11, 2023
It has been reverse engineered
https://github.com/mist64/geos
In PC GEOS: the multitasking DOS-based GUI OS that evolved from a C64 desktopmist64
geos
Assembly2016–2023
mist64 / geos
geos
Source code of GEOS 2.0 for the Commodore 64 and 128
7Distinct people
7Mentions
1Explicit recommenders
488GitHub stars
What to know before exploring
What it is
Source code of GEOS 2.0 for the Commodore 64 and 128
GitHub
Where it is used
No documented product use has been verified yet.
What people are saying
I love this kind of stuff! Related is the reverse engineered GEOS (C64) available at github: https://github.com/mist64/geos The maintainers are gearing up to support more…
exlurker used a recommendation phrase. One indexed comment matches. This is a phrase match, not a verdict.
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Also in these discussions
No other repository is repeatedly linked in the same discussions.
This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 3:56:07 PM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by year7 dated mentions
Observed mentions: 2016-08-20 15:49:45 UTC to 2023-12-11 08:03:56 UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| 2016 | 2016-01-01 00:00:00 UTC | 2017-01-01 00:00:00 UTC | 3 | 1 | 2 |
| 2017 | 2017-01-01 00:00:00 UTC | 2018-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2018 | 2018-01-01 00:00:00 UTC | 2019-01-01 00:00:00 UTC | 2 | 0 | 2 |
| 2019 | 2019-01-01 00:00:00 UTC | 2020-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2022 | 2022-01-01 00:00:00 UTC | 2023-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2023 | 2023-01-01 00:00:00 UTC | 2024-01-01 00:00:00 UTC | 2 | 0 | 2 |
What Hacker News says
7 sourcesGEOS is an early GUI system for the Commodore 64 computer.
https://github.com/geos64128/HG2G2022
That manual contains some detail on how it works.
Source code for GEOS
https://github.com/mist64/geos
Quickdraw is the graphics library for the Apple Macintosh
https://computerhistory.org/blog/macpaint-and-quickdraw-sour...
Digital Research GEM is another early GUI used in that Atari ST line of computers and later PC systems. Source code is available on the following page.
http://www.deltasoft.com/downloads.htm
In Ask HN: Resources to learn how GUI libraries were/are made?The source code for the C64 version is available here too:
https://github.com/mist64/geos
In PC/GEOSWorth mentioning that GEOS itself has been completely reverse engineered and the fully commented 6502 assembler source is up on github: https://github.com/mist64/geos
In theory quite portable to other 'new' 6502/816 systems.
In C64 OS: A Commodore 64 OS with Modern ConceptsLooks like Geos for the C64 has recently been reverse engineered and is now available on GitHub.
https://en.wikipedia.org/wiki/GEOS_(8-bit_operating_system)#...
https://github.com/mist64/geos
In Why the Apple II ProDOS 2.4 Release Is the OS News of the YearI love this kind of stuff! Related is the reverse engineered GEOS (C64) available at github: https://github.com/mist64/geos
The maintainers are gearing up to support more platforms, CPUs, repair and extend!
In Why the Apple II ProDOS 2.4 Release Is the OS News of the YearReverse engineered Source code of GEOS 2.0 for the Commodore 64
3 points · Open discussion