Windows NT for Power Macintosh

Original Article ↗ Hacker News Discussion ↗

A new hobby project ports Windows NT 4.0’s PowerPC build to run natively on vintage Power Macintosh hardware, highlighting the original NT architecture’s portability and the complexity of writing a new hardware abstraction layer and boot path over Open Firmware. Commenters reminisce about NT’s multi‑architecture era (PPC, MIPS, Alpha), compare it with today’s x86 dominance, and note how little practical software exists for PPC NT beyond curiosity value. The project also triggers broader what‑ifs around Apple’s 1990s OS choices (NeXT vs BeOS vs A/UX) and how those decisions shaped today’s macOS, iOS, and mobile landscape.

Project overview & capabilities

  • Port runs Windows NT 4 natively on PowerPC-based Macintosh hardware (e.g., G3 iMac, B&W G3), not via x86 emulation.
  • As a result, typical DOS/x86 games are not supported; NTVDM on PPC relied on an x86 emulator and is limited.
  • Screenshots and prior work (e.g., NT4 on Wii) are referenced, and several commenters express strong enthusiasm and nostalgia.

NT on non‑x86 architectures

  • NT4 historically supported PowerPC, Alpha, and MIPS; PPC support ended after Service Pack 2.
  • Discussion of why PPC NT faded: low market share vs x86, Apple’s lack of interest in PReP/CHRP, and no strong desktop demand.
  • Xbox 360 is cited as a later example of NT‑derived OS on PowerPC.

Boot, HAL, and firmware details

  • NT was designed to be portable: architecture-neutral kernel plus per-platform HAL and firmware interfaces.
  • This project supplies an ARC-like boot environment atop Open Firmware, a custom HAL for Mac hardware, and device drivers.
  • Writing a new HAL is described as difficult due to sparse documentation and subtle hardware assumptions.
  • ARC, SRM, EFI/UEFI, and Open Firmware are compared; Open Firmware’s Forth syntax is criticized as hard to read.

Software availability & practicality

  • Commenters note “basically zero” native PowerPC NT software, making the port more of a technical showcase than a usable daily driver.
  • Some mention niche possibilities (e.g., compiling with available PPC toolchains, running legacy NT PPC binaries) but expectations are low.

Historical OS context & nostalgia

  • Extensive side discussion on Windows NT’s evolution, its POSIX and UNIX subsystems, and later WSL.
  • Comparisons with AIX, Solaris, classic Mac OS, Copland, BeOS, NeXTSTEP/OpenStep, and alternate Apple-history timelines.
  • Many reminisce about multi-architecture NT, Alpha systems, early UNIX exposure, and the broader era of experimental OS projects.