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0S // SYSTEMS DIVISION

We build the systems too.

An entire division of the studio devoted to one absurd, beautiful idea: writing the operating systems and shells these machines always deserved. From a Commodore 128 in forty columns to a DOS that grew windows. Five systems, fifteen years of alternate history, zero licenses.

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ChumOS Infinity

16-BIT · AMIGA · Amiga 500 · KS 1.3+

The synthwave Workbench the A500 deserved.

A brand-new desktop for the 1987 Commodore Amiga 500, written in 2026: a synthwave-styled environment with ten "Centers", fifteen games and demos — including Neon Dungeon, a first-person 3D dungeon crawler on a stock 68000 — office apps with a real formula engine and ARexx automation. All inside a single 160 KB executable that boots from one floppy and uses 0% CPU when idle.

DECLARED RIVALVS Workbench
// SPEC SHEET
A500 · 68000 · 1MB160 KB · one floppy10 Centers · 8 games · 7 demosMIT · 0% idle CPU
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VIEW FULL SPEC →

Castalia DOS 1.0 “Tombatossals”

386-CLASS · DOS · FreeDOS · 386SX+

A Mediterranean fortress for your 386.

A serious, beautiful, game-focused DOS for real 386 hardware. FreeDOS underneath, a text-mode fortress identity on top: eight memory profiles, a game launcher, an installer and a rescue disk. The machine boots onto CASTALIA and nothing else.

DECLARED RIVALVS MS-DOS 6.22
// SPEC SHEET
386SX+ · 640K · VGAFreeDOS + Open Watcom8 boot profilesMIT + GPLv2+ · no Microsoft
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VIEW FULL SPEC →

Castalia 92 v0.52

386 · VGA 13h · DOS 3.3+ · 386

The Windows 95 your 386 never got.

A complete graphical desktop for DOS — overlapping windows, a taskbar and Start button, thirty-plus built-in programs, eighteen themes and a demoscene screensaver — that boots from DOS and flies on 4 MB of RAM. Free, MIT, and written in period-correct C89. The Windows 95 every 386 owner dreamed of in 1992, three years early and 120 KB small.

DECLARED RIVALVS Windows 95
// SPEC SHEET
386SX+ · 4 MB · VGA 320×20030+ programs · 13 games18 themes · 16 demoscene saversMIT · real-mode C89 · 0 libraries
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VIEW FULL SPEC →

CastaliaOS 98 PE v0.1.0 · PE

DESKTOP · FREEDOS · FreeDOS · DOS/4GW

The 90s desktop. Zero Microsoft code.

An original Win9x/XP-inspired desktop, written from scratch in portable C89, that boots on FreeDOS as a 32-bit protected-mode binary. It composites its entire UI into a 32-bit XRGB back buffer and presents it at 8 or 16 bits with no dithering: ten real applications, four virtual desktops and .CAPP add-ons, with no Microsoft code anywhere.

DECLARED RIVALVS Windows 98 SE
// SPEC SHEET
FreeDOS + DOS/4GW · VESA 800×60018,462 lines of C · 93 files10 apps · 4 desktops · .CAPP add-ons457 tests green · MIT
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VIEW FULL SPEC →

C-128 WorkSpace 2026

DESKTOP · COMMODORE 128 · Commodore 128 · BASIC v7.0

A desktop the C128 never got. In BASIC.

A graphical desktop for the Commodore 128, written entirely in BASIC v7.0: a menu bar, twelve tools behind twelve PETSCII icons, windows with shadows, three themes and a textured ground — in forty columns on a 1 MHz VIC-IIe, with no REU, no 80-column monitor and not one bitmap. It draws by POKEing straight into screen and colour RAM, and it opens in about three seconds because the launcher is blitted from disk rather than drawn. A second edition puts seventeen apps on the 80-column VDC.

DECLARED RIVALVS GEOS 128
// SPEC SHEET
BASIC v7.0 · 3 hand-assembled 6502 routines12 tools in 40 columns · 17 apps in 803 themes · 4 grounds · joystick or keyboardBoots in ~3 s · no REU, no bitmaps
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0C // US vs. THEM
The chart they don't want you to see
6 SISTEMAS · 1 VERDAD

An honest comparison, no thumb on the scale: where the rival wins, we say so. Pick a system and watch how it does against its declared adversary — we take freedom and telemetry, and concede the rest like sports.

US · ChumOSTHEM · Workbench
SPEED
84
88
LIGHTNESS
78
84
FREEDOM
92
70
NO TELEMETRY
100
92
SOUL
95
88
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