Microsoft
The Original Build
- Microsoft
- Mssng Peces
- Assembly
- Digital experience design
- Custom OS & game development
- WebGL shader development
- Multi-device show control
- Hardware integration
1975 on the surface. 2026 underneath.
Microsoft turned 50 at Build 2025, and to mark it, they sent 23,000 developers back in time. Into a wood-paneled 1970s office. Four Altair 8800 terminals. A working CRT. Period-correct keyboards, no mouse in sight.
Underneath every pixel of that authentic retro surface, we engineered a modern stack that behaved exactly like DOS would have in 1975, while quietly coordinating four stations, a badge printer, a leaderboard, and triggered video playback across the room.
Mssng Peces and Assembly led the installation for Microsoft. We built the digital layer: the OS, the games, the shader, the networking, the show control. The invisible software that had to feel like old tech and hold up as live tech for four straight days at Microsoft's flagship developer conference.
The Phone Rang Across 50 Years
Scott Hanselman, Microsoft's veteran developer advocate and one of the most recognizable voices in the dev community, walked the installation on camera, debugging Paul and Bill's telephone code one line at a time. When he got the last answer right, the desk phone rang. He picked it up. On the other end: himself, in 1975, working at a new company called Micro-Soft.
That was the moment the room stopped being a set. A developer who has seen every demo Microsoft has ever shipped got pulled into the fiction, live, in front of a camera. No seams. No modern UI peeking through. Just basic code, a working phone, and a voice from fifty years ago.
"This is probably one of the coolest things I've ever got to play with."
The Spell Had to Hold
Authenticity was the whole point. If the monitors looked modern, if text rendered too cleanly, if a scroll behaved like 2025 instead of 1975, the spell breaks. Worse: Microsoft's own developer community, the most detail-sensitive audience on earth for this kind of thing, would spot it instantly.
The digital experience had to do three impossible things at once. Feel completely period-accurate, down to the shader artifacts on the glass. Run a coordinated multi-device show with four stations, a printer, a TV, and a live leaderboard all in sync. And stay bulletproof under live conference conditions, on retrofitted hardware with non-standard resolutions, in front of Trevor Noah, GitHub's CEO, and every developer creator Microsoft had invited.
No mouse. No escape hatches. No second takes.
Every Character, Pixel by Pixel
We built the operating system from scratch. Not a skin over a modern UI, but a genuine DOS-like environment with its own command interpreter, file system, and navigation model. Every character rendered to HTML canvas with pixel-perfect layout and stacking. DOM elements wouldn't have passed the authenticity test, so we drew it ourselves.
Then we wrapped the whole thing in a custom WebGL shader: scan lines, barrel distortion, phosphor bloom, the soft glow that gives 70s CRTs their character. A slider-based config panel let the Creative Director tune the shader live on-site, dialing in exactly how much each monitor should warp and breathe.
The full DOS command set shipped. CD, DIR, backspace, folder traversal, state tracking. Everything keyboard-driven, because that's how 1975 worked.
Every Station Talked to Every Other
Three timed challenges ran across the floor. A code debugger where attendees raced the clock to fix errors in period-correct code, with multiple-choice fixes and a context-sensitive hint ladder that escalated line by line. A file system Easter egg hunt that rewarded DOS navigation and triggered archival Bill Gates video on the 4:3 CRT the moment a hidden file was found. And a photo badge challenge that captured the player, composited a retro "Team 1975" Microsoft employee badge, and sent it to the printer.
A central server coordinated four Altair stations, the leaderboard, the badge printer, and the CRT video playback. WebSockets between every device. A real-time database holding global state. Trigger an Easter egg at Station 3 and the CRT across the room fires a Bill Gates interview. Complete the debugger at Station 1 and your score lands on the leaderboard before you lift your hands.
Writing Software for Hardware That Didn't Exist Yet
The hardware was the wildcard. Intel NUCs stuffed into real Altair 8800 shells, driving vintage monitors with non-standard resolutions and tiny screens. A 4:3 CRT with an oddball aspect ratio. And most of the software had to be written before the final hardware was available.
So we built a simulation system that let us test against target resolutions and screen sizes from our own desks, plus a dynamic adjustment toolkit for on-site tuning. Live sliders for resolution, font size, and readability, so we could walk up to any station on install day and dial in the exact legibility curve that worked.
The whole application shipped inside Tauri, the Rust-based framework, locked down so completely that no keyboard combination could escape the experience. Stress-testing tools beat the system up before it went live. An auto-update pipeline pushed fixes remotely during the show. None of this was visible to attendees. That was the point.
The Hardest Audience Believed It
23,000 developers walked through the space across Build 2025. Every creator Microsoft invited stopped by, including surprise drop-ins from Trevor Noah and GitHub CEO Thomas Dohmke. Linus Tech Tips filmed a segment inside the installation that reached 1.6 million viewers on YouTube. Microsoft leadership called it "the coolest thing we've ever done for developers," and there's internal buzz about taking it on a global tour.
Press coverage landed across Ad Age, LBBOnline, DesignTAXI, DesignRush, and themarketmag. Mssng Peces rode the activation into its tenth consecutive year on the Ad Age A-List and a 2025 Webby Production Company of the Year nod.
The installation sold a 50-year-old origin story to the developer community Microsoft was built on. It felt like 1975 and ran like 2025.
