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This is the source of DOStodon, a Mastodon client for MS-DOS.

DOStodon is implemented in Javascript and relies on a yet unreleased version of DOjS to run.

Quick start

  • You need a VM, real HW or DOSBox-staging with a network card and a matching packet driver to use it.
  • A Pentium 133 or faster with at least 32MiB of RAM is recommended.
  • Packet drivers can e.g. be found on (make sure to download the driver from the "PC/TCP PACKET DRIVERS" section) or on or
  • You don't need any TCP/IP stack, Watt32 is compiled into the program and directly uses the packet driver
  • Make sure you read the section about the limitations!
  • see "DOSBox-staging config" below for an example config that works (for me) with DOSBox-staging

Just download the whole repository.

Help on this project is very much appreciated, contact me on Twitter, Mastodon or in the DOjS Discord if you want to help or have questions...

Linux version

There is a highly experimental Linux version of DOStodon included. It is based on DOjS v1.12. You can try it at your own risk. You need to compile DOjS yourself, please look at this instruction how to do that. Fullscreen mode does not get keyboard input on WSL2, you can switch to windowed mode by removing the -u option in

DOStodon timeline

DOStodon profile

DOStodon find user

DOStodon hashtag


First start

Please run DOStodon <server> <email> <password>

  • server: the URL of the server you want to connect to (e.g. or Can be with or without https:// prefix.
  • email: the email address used for registration (shown on the Preferences -> Account page in the web).
  • password: Your server password. 2FA is not supported. Your password should not contain any non 7bit ASCII characters.

Example: DOStodon 123abcABC

The access tokens are stored in CREDS.JSN if the login is successful.

subsequent starts

Just run DOStodon.

Proxy support

If you want DOStodon to use a proxy you have to set the following ENV variables:

  • PROXY_HOST: HTTP proxy to use. The parameter should be a string holding the host name or dotted IP address. To specify port number in this string, append :[port] to the end of the host name. The proxy string may be prefixed with [protocol]:// since any such prefix will be ignored. The proxy's port number may optionally be specified with the separate function SetProxyPort().
  • PROXY_PORT: Pass a port number with this option to set the proxy port to connect to unless it is specified in the proxy string using PROXY_HOST.
  • PROXY_TYPE: set this to SOCKS to use a SOCKS proxy. If unset or set to anything else a HTTP proxy is asumed.


DOStodon supports NOISE.SYS, a MS-DOS random number generator. It can be obtained here:



  • ESC: Quit DOStodon
  • h/H/?: Help screen
  • F1: Switch to home timeline
  • F2: Switch to notifications
  • F3: Switch to hashtag timeline
  • F4: Switch to local timeline
  • F5: Switch to global timeline
  • F6: Switch to bookmarks list (last 40)
  • F7: Switch to favourites list (last 40)
  • F10: Switch to Toot composer
  • F11: Info screen
  • F12: Poll/Refresh home/notification timelines
  • UP/DOWN, Page UP/DOWN, HOME/END: scroll entries in home/notifications
  • p: Show profile of currently selected entry (for boosts the boosters profile)
  • P: Show profile of currently selected entry (for boosts the original profile)
  • CTRL-S: Save screenshot as PNG. Screenshots are numbered, starting with 1.PNG.
  • CTRL-P: Search for a user/profile. The profile is displayed when pressing ENTER.
  • CTRL-C: Show config dialog
  • DEL: close dialog


  • b: Boost/reblog currently selected toot in home screen
  • B: UN-Boost/reblog currently selected toot in home screen
  • f: Favorite/like currently selected toot in home screen
  • F: UN-Favorite/like currently selected toot in home screen
  • m: Bookmark currently selected toot in home screen
  • M: UN-Bookmark currently selected toot in home screen
  • R/r: reply to selected toot in home screen
  • D/d: Print JSON of selected toot in home screen to logfile
  • C/c: Toggle toots with content warning
  • 1..4: show media attachment 1 to 4. Any key to close.
  • 5: show show YouTube preview image. Any key to close.
  • CTRL-1..4: show image description of media attachment 1 to 4. Any key to close.
  • ENTER: show thread view of current entry, DEL or BACKSPACE to return to timeline.
  • CTRL-B: Toggle toots&boosts, boosts only, toots only
  • CTRL-M: Toggle showing posts with media only

Tag timeline

  • T/t: change tag
  • ENTER: confirm tag in tag editor
  • BACKSPACE: delete character in tag editor


  • L/l : Toggle showing of favorites
  • B/b : Toggle showing of boosts
  • F/f : Toggle showing of follows
  • M/m : Toggle showing of mentions
  • O/o : Toggle showing of other notifications
  • SPACE : Reset all filters


  • CTRL-ENTER: Send toot in Toot editor
  • CTRL-P: Open account search, ENTER puts the selected account into the toot
  • BACKSPACE: delete character
  • DEL: delete toot composer text and reply-to toot
  • TAB: switch toot visibility between public, unlisted, private and direct.
  • INSERT: Image selector for image attachments to the toot.

Profile screen

  • ENTER: close profile
  • f: follow
  • F: unfollow
  • b: block
  • B: unblock
  • m: mute
  • M: unmute
  • T: Write toot to account


  • DOStodon is busy while the Mastodon logo is displayed in middle of the screen. Don't hit keys like crazy, every keypress will be queued :)
  • DOStodon polls home/notifications every 5 minutes for new entries. Countdown is in the lower right corner.
  • To add a content warning/spoiler to a toot start the toot with "cw:". The first line of the toot will be the content warning, all subsequent lines will be the body text of the toot.
  • If you press DOWN on the last entry in home/notifications older entries are fetched.
  • Favourite/boost/bookmark status ([FBM]) is displayed below the profile picture of each toot.
  • The selected hashtag is displayed in the upper right corner of the hashtag timeline.
  • When first selecting the hashtag timeline you have to enter a hashtag.


  • 2FA is not supported right now!
  • logging in with passwords that contain characters outside 7bit ASCII might not be possible
  • HTTPS requests can take quite a lot of time, be patient!
  • Can't play videos/audio
  • Image attachements are just drawn at the upper left corner
  • No support for HTML tags, they are (badly) filtered out
  • No support for emojis (replaced by spaces)
  • No support for characters like umlauts, etc.
  • The toot composer only supports BACKSPACE, it is not a real text editor.
  • Bookmarks and favourites do not support pagination (yet).
  • NO REAL TESTING/QUALITY ASSURANCE! Folks, this is a fun project, if you need a production ready client contribute or use something real! If it works for you, it works, but don't blame me for broken commits or missing features...


The source is split into several files right now:

  • dstdn.js the "application"
  • home.js the home timeline
  • imgcache.js image fetching/caching
  • info.js info screen display
  • splash.js splash screen
  • mstdn.js contains the Mastodon REST API
  • notific.js the notification timeline
  • profile.js profile viewer
  • toot.js toot creation
  • util.js support code
  • dialogs.js all input fields
  • filsel.js image file selector

DOStodon is implemented using DOjS native API (no p5js emulation). Network operations block the input processing/rendering.

DOSBox-staging config

I use DOSBox Staging to test this version of DOStodon. A NE2000 packet driver can be found on this page here.

DO NOT use DOSBox-X right now, it has a known bug in file io which creates broken SQLite databases DOSBox-staging has a problem with mouse support, thats why I disabled that in the example config!

My dosbox-staging.conf looks like this:

capture_mouse = nomouse

memsize = 64

cputype = pentium_slow
cycles  = max

ne2000  = true
nicbase = 300
nicirq  = 3
macaddr = AC:DE:48:88:99:AA

mount c E:\_DEVEL\GitHub\DOStodon
ne2000 0x60 3 0x300


  • Look into character-encoding again
  • Busy indicator is missing for some network operations
  • Same network errors lead to an endless loop
  • Color themes?
  • invert timeline (oldest post on top)
  • ALT text for image uploads
  • Implement setting for CW toots (default collapsed or visible)
  • Fix bugs
  • Have fun


5. April 2024

  • Updated curl to 8.8.0
  • Updated mbedTLS to 3.6.0
  • Added NOISE.SYS support

5. April 2024

  • Updated curl to 8.7.1
  • Updated mbedTLS to 2.28.8
  • Updated zip to 0.3.2

01. February 2024

  • Updated mbedTLS and cURL for the DOS version
  • removed Linux binaries, added link to the compilation instructions of DOjS v1.12

26. January 2024

  • Added Linux version for Ubuntu 20.04 and ArchLinux

16. January 2024

  • Display votes with results in the notifications
  • Improve single choice voting dialog
  • Implemented multiple choice voting

13. January 2024

  • Improved handling of Unicode characters (displaying German Umlauts and other diacritic characters)
  • Finally display votes in the timeline
  • Enable voting in single-choice votes (sorry, no multiple choice votes yet)

06. January 2024

  • Updated curl to 8.5.0
  • Updated mbedTLS to 2.28.6
  • Updated zip to 0.3.1
  • Added example proxy config to `DOSTODON.BAT``

16. Oktober 2023

14. Oktober 2023

  • Added webp image format

11. Oktober 2023

  • Security update to curl 8.4.0 and mbedTLS 2.28.5
  • Fixed tag selection in tag screen display

23. august 2023

  • highlight DMs in timeline and notifications
  • added visibility options to toot editor
  • added visibility to toot display

05. august 2023

  • Added proxy support through ENV variables

19. july 2023

  • Updated DOjS to curl-8.2.0

8. july 2023

  • fixed drive letter detection in the file selector
  • file selector cursor start position is between drives and files now
  • fixed 'parent' handling in file selector
  • accept HTTP status 206 for home timeline

25. june 2023

  • recompiled DOjS with GCC 12.2 and DJGPP CVS (fixes SSL/date bug AGAIN)
  • added YouTube video preview

21. june 2023

  • added image upload/attachment to toots

14. may 2023

  • newly polled entries in home and notifications screens are now highlighted red

10. may 2023

  • Fixed a bug with displaying boosted toots when they had a content warning
  • Moved filter display in notifications to lower left
  • Added filtering of Toot-types to timelines: boosts, original toots and media attachments

7. apr 2023

  • Updated to DOjS 1.11alpha with mbedTLS 2.28.3 and curl 8.0.1

4. mar 2023

  • view the timeline of an account by pressing F3 on the profile screen
  • updated DOjS, now using mbedTLS 2.28.2

4. feb 2023

  • Help pages will now also be displayed when pressing ?.
  • Enabled auto_vacuum for SQLite image cache.
  • Added rainbow colors to the thread view.
  • Reduced indentation in thread view.
  • Added highligting of "root" entry in thread view.
  • You can now press RETURN in thread view to see details of displayed children.
  • Added configuration dialog (press CTRL-C) and config saving to CFG.JSN.
  • Changed some colors
  • CTRL-L and CTRL-W to load/save the timeline position is still work in progress!

14. jan 2023

  • Profile view now shows the header image as well
  • You can toot to the profile owner now by pressing T
  • DOStodon now returns to the calling screen after replying to a toot
  • CTRL-P in the editor lets you search for an account
  • Added "reply" marker <
  • Improved thread view and search dialog

13. jan 2023

  • Implemented indentation and lines for toot context view (threads)

12. jan 2023

  • Toots and notifications now show the time in a more readable fashion as a relative time.
  • Added type filter for notifications

8. jan 2023

  • Updated DOjS, new curl, new jpeg decoder and bugfixes
  • Tinkered a little bit on the splash screen
  • You can now press t to select a hashtag from the current toot and display the hashtags timeline
  • You can now press F1/F2 in profile view to show a list of followers/following accounts.

7. jan 2023

  • Added 'LOCKED' and 'BOT' info to profile screen.
  • Used a smaller font for timeline timestamps and toot stats
  • You can now search for a user (profile) by pressing CTRL-P
  • Lots of small internal optimizations, especially text rendering

6. jan 2023

  • New, experimental word wrapping algorithm with support for coloring hashtags and handles

1. jan 2023

  • Reworked the "login" section in the README
  • You can now save PNG screenshots using CTRL-S

29. Dec 2022

  • Added scroll indicators ^ and v at the very right of the screen
  • Added thread view for toots.
  • Fixed bug with toggling content warnings on toots with no spoiler text
  • Added image description viewing
  • Added help screen when pressing H

28. Dec 2022

  • Added local timeline
  • Added global timeline
  • Added hashtag timeline
  • Added 'view bookmarks'
  • Added 'view favorites'
  • Added text input field
  • Reworked sidebar
  • Added auto refresh countdown

26. Dec 2022

  • Fixed issue with the image cache
  • Fixed issue with profile screen follow/block/mute function
  • Fixed wrong sound being played
  • Added Makefile to create DOSTODON.ZIP

22. Dec 2022

  • Added follow/mute/block info to profile screen
  • Added (un) follow/mute/block keys to profile screen (yet untested)

20. Dec 2022

  • Updated README regarding DOSBox (switched from DOSBox-X to DOSBox-staging)
  • Added UnBoost and UnFav
  • Added Bookmarks
  • Added boost/fav/bookmark markers
  • Added splash screen
  • Added SQLite based image cache. Images are deleted from cache after 28 days.

19. Dec 2022

  • Updated README regarding DOSBox-X
  • Added debug timestamp during startup
  • Fixed 486 incompatibility (hopefully)

17. Dec 2022

  • Switched compiler for DOjS from GCC 7.2.0 to 12.2.0
  • Added UTC date of toots

15. Dec 2022

  • Fixed a time() bug in DOjS and re-enabled certificate validation.

14. Dec 2022

  • Switched from nanojpeg to libjpeg to be able to load progressive JPEGs
  • Added toot stat display to home screen

13. Dec 2022

  • Disabled TLS/SSL certificate verification for now. DOStodon is not able to verify the certificate of anymore and I need to dive deeper into the reason for that.
  • Added Page UP/DOWN and HOME/END to home and notifications
  • Added content warnings/spoilers to the toot composer
  • Added fetching of older entries when viewing home/notifications

11. Dec 2022

  • Fixed a memory corruption in DOjS
  • Images are no longer saved into TMP files
  • Images are now scaled to fit the screen when displayed

4. Dec 2022

  • implemented LRU cache for images
  • fixed some quirks with key handlings
  • DOjS now uses cURL 7.86.0

2. Dec 2022

  • Blurhash is now implemented in C

1. Dec 2022

  • added <CW> for content warnings, you can toggle the toot with C
  • added media indicator for non-images (e.g. <video>)

30. Nov 2022

  • added JS based blurhash

27. Nov 2022

  • implemented connection reuse
  • you can now reply to toots by pressing R
  • you can now clear the toot-composer by pressing DEL
  • improved display of boosted toots
  • added sounds

26. Nov 2022

  • DOjS now uses mbedTLS instead of OpenSSL
  • changed display of user handles
  • added info screen
  • reworked Mastodon-API, prepared it to re-use cURL objects (doesn't work yet)
  • now shows a busy indicator when fetchingt iages during scrolling
  • disabled alpha channel to speed up rendering

18. Nov 2022

  • code cleanup
  • several fixes all over the place
  • added splash screen
  • added entry scrolling
  • added manual reload with F5
  • changed polling time from 1min to 5min
  • added profile viewer
  • added media preview
  • added media showing
  • added liking
  • added boosting
  • added "busy" indicator

16. Nov 2022

  • added some help in
  • first working version

14. Nov 2022

  • first public release
  • didn't work