@rustlang targets is like to see - a long-running thread:
m68k-apple-system

For developing for classic Macintosh System 1 to System 7.

The lack of a proper name for that OS it's confusing.
powerpc-apple-macos

For developing for PowerMacintosh systems running MacOS 7.6, MacOS 8 and MacOS 9.
powerpc-microsoft-windows

For developing for PowerPC versions of Windows NT 3.51 and 4.0.

Wasn't sure if the vendor for this one. The CPU is from the Apple-IBM-Motorola alliance, and NT runs on the IBM PowerPC Reference Platform (PReP).
mips64-sgi-irix

Developing for the 64-bit Silicon Graphics MIPS workstations, like the Indy, O2, Octane, etc. IRIX was SGI's UNIX implementation, which gave us XFS and OpenGL.
powerpc-apple-darwin

Developing for PowerPC MacOS X machines running 10.0 Cheetah to 10.4 Tiger.

I had an iBook G3 and it was fabulously unreliable, but there were some interesting machines from this period. Plus, the pinstriped Aqua UI!
i386-pc-dos

Developing for MS-DOS (and DR-DOS, etc) systems with an Intel 80386 CPU or higher, and hence having a flat 32-bit Protected Mode.
arm-acorn-riscos

Developing for RISC OS systems. As developed for and introduced on the Acorn Archimedes range, it's still available today on a selection of Arm SBCs.

Early machines only had 26-bit addressing, so not sure how to reflect that in the triple. Maybe a -riscos3?
m68k-sun-sunos

Let's write some code for the early Sun workstations, like the 68020 powered Sun 3/60! SunOS was a 4.2BSD derivative and later replaced by the UNIX System V Release 4 based Solaris.
parisc-hp-hpux

Yeah, let's do some HP RISC Workstation dev! Something like the HP 9000 Series 700, with its PA-RISC processor running HP's take on UNIX System V. HP vs Sun, who will win?

Spoiler alert: They both lost.
ia64-pc-windows-msvc

Talking of losing ... 20 years ago Explicitly Parallel Instruction Computing was the future, and the VLIW 64-bit Intel Itanium was its king. Except it didn't work out.

Maybe LLVM can finally help it meet its promise on Windows XP for IA64?
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