Welcome to the Alternate timeline.

// 64-bit RISC operating system

JAGOS'SPOT'

Turn your Atari Jaguar into the home computer Atari never released.

Support on Patreon Download Join our Discord
Build
1.0.241
ROM
6 MB
Status
Preview
JagOS desktop: menu bar reading JagOS, Apps, Places, Settings, View, Help and Spot 1.0.259, a misty canyon wallpaper, app icons, and a status bar showing free RAM 642K and ROM 6MB
Real JagOS desktop on an Atari Jaguar // Screen: Clint Thompson

01 // What is JagOS

A desktop for the Jaguar.

  1. Real OSMenus, windows, wallpapers, apps and games on a stock Atari Jaguar.
  2. Painter DNAInspired by the Atari Painter, an unreleased home computer built on the Jaguar chipset.
  3. GameDriveRuns from the RetroHQ GameDrive and saves to its SD card. USB keyboard + mouse via adapters.
  4. By ClintBuilt by Clint Thompson since 2023. Preview Beta coming soon!
Lines demo drawing a rainbow wireframe pattern in a window on the JagOS desktop
Lines wireframe demo, running on the Jaguar // Screen: Clint Thompson
// Dev start
2023
// ROM
6MB
// RISC OS
64-BIT
// Mouse + keyboard
30.09.26

02 // Screens 12 captures

Straight off the Jaguar.

The Jaguar's own SD captures.

JagPEG window showing a photo of a jaguar in the grass
01JagPEG image viewer
JagOS desktop with an autumn forest wallpaper and app icons
02Desktop // build 1.0.241
Clock app with an analog JAGUAR clock face and a digital readout 01:28:12
03Clock
Settings window, Theme tab, listing desktop colours Midnight, Ocean, Forest, Amber, Snow, Jaguar, Carbon and Neon
04Settings // Themes
Settings window, Wallpaper tab, with six desktop photos to choose from
05Settings // Wallpapers
JagPAINT with a red circle, orange rectangle and line shapes on a green canvas
06JagPAINT
JagPAD notepad reading Welcome to the future, with an on-screen keyboard
07JagPAD notepad
JagPONX, a Pong-style game, in a window
08JagPONX
Terminal window with an on-screen keyboard and command buttons
09Terminal
A Breakout-style game with rainbow rows of bricks
10Breakout-style game
JagIRC chat window with messages and a user list
11JagIRC (simulated chat)
Lines window drawing a rainbow wireframe pattern
12Lines demo
  1. Screenshot 1: JagPEG image viewer
  2. Screenshot 2: Desktop // build 1.0.241
  3. Screenshot 3: Clock
  4. Screenshot 4: Settings // Themes
  5. Screenshot 5: Settings // Wallpapers
  6. Screenshot 6: JagPAINT
  7. Screenshot 7: JagPAD notepad
  8. Screenshot 8: JagPONX
  9. Screenshot 9: Terminal
  10. Screenshot 10: Breakout-style game
  11. Screenshot 11: JagIRC (simulated chat)
  12. Screenshot 12: Lines demo

Transmission // 10:59 23.09.2026

Watch Spot run.

Runtime
10:59
Posted
23.09.2026
Shows
Boot // Desktop // Apps // Games
Video still: the JagOS boot screen with the leopard-print SPOT logo Play video: JagOS 'Spot' Preview by Clint Thompson (opens YouTube; loads in page if JavaScript is on)

"JagOS 'Spot' Preview": boot, desktop, apps and games on a stock Jaguar // Video: Clint Thompson // Loads from youtube-nocookie.com only when you press play

JagNET // Network Coming soon

JAGNET and JAGLYNX

Lynx owners can now take on Jaguar owners and play live over JagNET both locally and online! JagNET with JagLYNX cross-play, Jaguar and Lynx owners playing together. Coming soon.

Lynx // AtariDude

A real Atari Lynx handheld, cut out from a photo, with LYNX CHECK running on its screen
Jaguar JagCHECK over JagNET: KidZero (YOU) VS AtariDude (RED), a checkers board mid-game with both player portraits and YOUR MOVE

Jaguar // KidZero

Coming soonLynx owners take on Jaguar owners, live over JagNET. AtariDude plays red from his Lynx while KidZero answers on a Jaguar, move for move on one shared board.

Games // Upcoming Coming soon

Upcoming JagOS games.

Online features exclusive to Patreon Supporters!

01 // Featured Coming soon

Risky Keys

Type fast. Miss once and the shotgun fires.

A fullscreen typing game for JagOS. A mistake erases the line and you type the sentence again. Live average WPM, with the top 10 saved to the SD card.

  • Keyboard Supported via RetroFrog USB4JAG
  • Live WPM
  • Top 10 saved to SD
Risky Keys title logo: RISKY KEYS on tilted gray keycaps with red fingerprints and dripping blood
  • JagPONX running in a JagOS window: two paddles, a dashed centre line and the score 0 to 1

    02 // Arcade Complete

    JagPONX

    An inverted twist to a game you think you know!

    2-player support coming soon!

    Supports Wireless CX78+ Joypads!

  • Jag+Lynx JagNET Enabled
    JagCheckers title art: blue graffiti lettering with red and blue checkers pieces and red drips
    • JagCHECK in-game board: KidZero (you, red) versus the Jaguar (black) a few moves into a game, YOUR MOVE prompt

    03 // Board // JagNET Complete

    Checkers

    Play against other Jaguar and Lynx* fans in checkers through JagNET!

    *Future support feature yet to be implemented.

  • Jag+Lynx JagNET Enabled
    DarkDarts title screen: gold DARKDARTS lettering over a smoky gothic darts parlor with a dartboard and red leather chairs
    • DarkDarts gameplay: aiming crosshair over the dartboard with the green throw-power meter on the left
    • DarkDarts gameplay: a dart stuck in the board after a throw, player portraits and scores at the sides

    04 // Parlor Coming soon

    DarkDarts

    Darts are more fun played in the Dark! And with your friends via JagNET on the Atari Jaguar or Lynx!

    *Future support feature yet to be implemented.

  • 2DIE4 gameplay, World 1 level 1-1 Satellite Attic: a red and gold cube on glowing cyan tiles floating in a deep starfield, moves 04 and par 09 top left

    05 // Puzzle // 3D Coming soon

    2DIE4

    Mysterious rolling space cube puzzle game in beautifully textured 3D on the Atari Jaguar!

  • Jag+Lynx JagNET Enabled

    06 // In development Coming soon

    JagShip

    A new JagOS game in development. More soon.

  • Jag+Lynx JagNET Enabled

    07 // Cards // Lynx Coming soon

    Juno

    You know the game, now play it with your friends on their Atari Jaguar or Atari Lynx with cross-net JagNET gameplay!

    *Future support feature yet to be implemented.

Apps // Serious Coming soon

Killer Apps. 64-Bit Productivity.

Conquer real tasks in a 64-BIT dimension like it's 1995!

These aren't your momma's wind-up tinker toys. These are serious, professional apps designed to create beautiful art and music, just as PAINTER intended in the '90s!

01 // Raytracer Work in progress

JTRACE

A real raytracer on a stock Jaguar.

WORK-IN-PROGRESSJTRACE is still in active development.
What you see here is an early build.

Build a scene from spheres, cubes, cylinders, cones and tori. Give them gold, chrome, colour or checker materials, pick a sky and a floor, then watch the Jaguar trace every ray. You can raytrace-render endless scenes and animations to the RetroHQ Game Drive at any resolution and length. You're only bound by your imagination, SD space, and the time it takes the Jaguar to render them!

  • Scene builder
  • Gold, chrome, checker
  • Instant preview
  • Renders to SD
  1. SelectClick an object to pick it.
  2. MoveDrag on X/Z. Hold C and drag for height.
  3. ScaleDrag X/Y. C + drag for Z, A + drag scales all axes.
  4. RotateDrag on Y/X. C + drag for Z.
  5. DuplicateCopies the selected object.
  6. DeleteRemoves the selected object.
  7. CameraDrag to orbit the view.
  8. Instant previewThe glove toggle: redraws only what changed, then fully refines when you stop.
JTRACE builder with three gold spheres on a red and white checker floor under a sunset sky, the tool menu open down the right edge
Tool menu, numbered to match the key.
Demo // 0:30Rendering, orbiting, a second scene, then the tools.
JTB // RenderA JTRACE animation rendered by the Jaguar
  • JTRACE render: a gold sphere, a chrome sphere and a ring of chrome spheres on a red and white checker floor under a dusk sky with horizon haze
    Gold + chrome // Dusk sky, horizon haze
  • JTRACE render: a gold sphere beside a chrome sphere, both reflected in a gold floor under a grey sky
    Gold + chrome // Gold floor, grey sky
  • JTRACE render: a single gold sphere on a red and white checker floor under a blue sky
    Gold sphere // Blue sky, checker floor
  • JTRACE classic scene Chrome Garden: chrome, green and red spheres and a blue pyramid on a red and white checker floor
    Classic scene // Chrome Garden
  • JTRACE render: a chrome sphere reflecting a blue sky above a grey marble-textured floor
    Chrome sphere // Marble floor, blue sky
  • JTRACE render: a red sphere and a chrome and blue sphere reflected in a rippling orange floor under an orange sky
    Red + chrome // Rippled mirror floor
  • JTA007: a finished JTRACE render saved by the Jaguar
    JTA007 // Saved render

02 // Synth Work in progress

JAS SEQ

Jaguar Audio Synthesis.

WORK-IN-PROGRESSJAS is still in active development.
What you see and hear here is an early build.

A multi-part synthesizer and sequencer running on the Jaguar's DSP. Shape patches with two oscillators, seven mix modes, a resonant filter, envelopes, an LFO and a 32-step mod sequencer. Play them across three parts on an 88-key piano, build songs in the pattern sequencer, then bounce them to WAV on the SD card.

  • 16 patch banks
  • 3 parts
  • 8 voices
  • Bounce to WAV
JAS v10.11 live: a 130 BPM techno groove with kick, bass and supersaw lead, hi-hats added while it plays, then filter and detune tweaks.
JAS patch editor: OSC, STEP MOD, DCF, LFO, DCA, VEL and OUT panels above the part strip and piano

Patch editor

  • OSC 1 + 2Saw, pulse, triangle (and noise on OSC 1), tune, transpose, level, pulse width
  • Mix modeNormal, merge, ring mod, FM, AND, OR, hard sync
  • DCF + DCALP, HP, BP or BS filter with resonance, key tracking and its own ADSR, plus the amp ADSR
  • LFO + step modLFO to filter, oscillators or levels, and 32 drawable mod steps
JAS bank grid A to P next to the SONGS list

Banks + songs

  • 16 banksA to P in one grid, banks I to P holding 128 extra patches
  • Bank toolsLoad, store, compare, rename, init, save all and load all
  • Song listClick a song to play it, 16 per page
JAS sequencer: a chord, bass and lead pattern playing the GLYPH song, with transport buttons and BOUNCE WAV

Sequencer

  • TransportPlay, stop, record, song or pattern mode, BPM and swing
  • Patterns16 or 32 steps, chained into a song
  • TracksChord, bass and lead lanes with accent, slide and patch rows
  • Bounce WAVRenders the song to a WAV on the SD card
JAS playing live: bank K bass patches listed, voice and DSP meters, piano keys lit

Play live

  • PartsChord, bass and lead, each with its own patch and level
  • Piano88 keys, lit in each part's colour by every sounding voice
  • MetersVoices used out of 8, plus DSP load
  • Keypad + mousePlay notes on the joypad keypad, edit with the Jaguar mouse
  • JAS patch editor on boot
    Patch editor
  • JAS sequencer playing GLYPH
    Sequencer // GLYPH
  • JAS banks grid and song list
    Banks + song list

Download // Status: locked

Temporary placeholder: demo not yet released

Coming soon! ETA: NOVEMBER 2026

"JagNET GAMES will blow your socks off and if they don't, the premium PAINTER inspired apps like JTRACE and JAS will!"

Release
Not yet
Build
Preview
Needs
Jaguar + GameDrive + SD
Download JagOS demoNot available

Follow the AtariAge thread or Patreon for the release.

03 // Support on Patreon SUPPORT.DATA

Five bucks. A whole OS.

  • $5Consistent JagOS updates + first access to test builds.
  • $10The JagNET beta, plus new games and apps every month.
  • $25Inside the hardware lab: behind-the-scenes updates, prototype contests, Lifetime Gold Credit for the first 42. Free gift to the first 64.

Less than a coffee run. And every month, the Jaguar gets better.

Tier 01

JagOS Fundamentals Supporter!

$5/month

  • Consistent JagOS updates
  • First access to test builds + feedback
  • Your name in the release notes
  • JagOS Discord access
Join for $5Opens Patreon

Tier 02 // Elite

JagOS Elite Enthusiast Supporter!

$10/month

  • Everything in Fundamentals
  • First access to JagNET beta builds (Risky Keys, BBS Games, IRC)
  • New games and apps in builds every month
  • Global game high scores

Coming soon JagLYNX cross-play on JagNET

Join for $10Opens Patreon

Tier 03 // Top tier Hardcore

The Meaning of Life Hardcore Supporter!

$25/month

  • Everything in both tiers
  • Behind-the-scenes hardware updates, posted nowhere else
  • Lifetime Gold Credit for the first 42 Hardcore Supporters
  • Contests for hardware prototypes + FREE GIFT to the first 64
Join for $25Opens Patreon

Gold Credit: in JagOS after 3 months of membership. Full tier details on Patreon.

04 // Roadmap RELEASE.PATH

JagOS roadmap.

  1. Release 01 Current // Upcoming

    JagOS 'Spot'

    As in "first spotted"

    Beta. The primary release, laying the base foundation of JagOS with basic apps and games.

  2. Release 02 Future

    JagOS 'Prowl'

    As in "prowling the internet"

    An advanced release supporting online gameplay, global high scores, downloads and new program installations, including self-update notifications when connected to JagNET.

  3. Release 03 Future

    JagOS 'Claw'

    As in "clawing" into external devices

    A feature-rich release with dedicated music applications and online-connected Lynx gameplay, with potential for cross-platform connectivity.

Social media coverage 21:40

Video still: Rees Rambles podcast, Ramble 172 thumbnail Play video: Social media coverage, Rees Rambles, Ramble 172, starts at 21:40 (opens YouTube; loads in page if JavaScript is on)

Hardware // Patreon-funded Prototyping

The Great Beyond.

01 // MIDI // DSP port In development

JAS MIDI

An externally controlled synthesizer using JAS.

A MIDI box with IN, OUT and THRU, linked to the Jaguar through a small adapter board on the console's DSP port. With enough support from Hardcore Patreon supporters, it will fund prototyping of the PCBs, which could become a future JagOS product for your MIDI devices, turning the Jaguar into an externally controlled synthesizer.

  • MIDI IN / OUT / THRU
  • DSP-port adapter
  • PCB rev 0.4.4
3D render of the JAS MIDI box PCB, rev 0.4.4: a blue board with three MIDI DIN sockets, a microcontroller module and a ribbon header
MIDI box, 3D render // Design: Clint Thompson
  • Rear view render of the MIDI box PCB showing the three MIDI sockets and the ribbon header
    MIDI box // Ports
  • Render of the DSP-port adapter: a small blue board with the console-side edge connector and a cable socket
    DSP-port adapter

02 // Console II // AF2037 ~95% done

Jaguar PCB Rev 2

A drop-in replacement Jaguar board.

A recreation of the Atari Jaguar Revision 2 (Console II) motherboard. It has been a painstaking process, tracing the 1993 board, then the 1994 board, and finally the 1994 Revision 2, to create a DIY drop-in replacement. The board is around 95% done and with enough Hardcore Patreon supporters, we can fund the prototyping and testing of these boards.

  • 1993 → 1994 → Rev 2
  • Drop-in DIY board
  • 3D model rev 7
Top-down 3D render of the populated Console II recreation board, rev 7, with the Tom and Jerry chips, DRAM and cartridge slot
Console II board, 3D render // Design: Clint Thompson
  • Angled close-up render of the Jerry chip on the rev 7 board
    Jerry close-up // Rev 7
  • Close-up render of the Tom and Jerry chips on the board
    Tom + Jerry
  • Close-up render of the Console II board in blue
    Console II board render, blue solder mask

Downloads // Upcoming Coming soon

Upcoming JagOS downloads.Downloads exclusive to Patreon Supporters!

  • Mister Buster title screen: a grinning gold robot ball with a bubble blaster in a rainbow of bubbles
    • Mister Buster gameplay: rows of coloured bubbles hanging under icicles between golden pillars, the launcher at the bottom
    • Mister Buster gameplay: the bubble cluster a few shots later

    01 // Game // Puzzle Coming soon

    Mister Buster

    Bubble-busting arcade puzzler. Aim the launcher, match the colours and clear the board.

    Full game

  • Hakkr Trakkr title screen: neon logo over the Sunnyvale Nights track, PRESS B TO START
    • Hakkr Trakkr race: the player's ship banking into a neon curve, lap, position and speed readouts on top
    • Hakkr Trakkr race: chasing the pack down a straight on Sunnyvale Nights

    02 // Demo // Racing Coming soon

    Hakkr Trakkr Demo

    Futuristic Hover Racer finally lands on the Jaguar in glorious 3D with atmospheric music! 6 Tracks, 6 Tunes, 2-player and future JagNET support planned!

    Demo only

  • DACTYL title screen: floating 3D platforms above the arena
    • DACTYL: WAVE 01 begins, the player on an orange pterodactyl with green riders circling
    • DACTYL: flying low over the arena on the orange pterodactyl

    03 // Demo // 3D Coming soon

    DACTYL Demo

    Travel back to 1995 and play the demo you've always wanted to try! Exclusively on JagOS.

    Demo only

05 // Contact TRANSMISSIONS

Transmit.

Transmit ideas from the future to the past and change the current timeline!

Questions? Ideas? Bugs?
Send a message to change the Future!

Or join the AtariAge thread. Your details are only used to reply.

JagSweeper minesweeper game window on the JagOS desktop
JagSweeper // Video frame: Clint Thompson

// Privacy

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Last updated: October 17, 2026

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Questions? Email JagOS@prototypecomputers.com.

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