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Collection of Apple Hardware Tests uploaded to GitHub, last updated in December, 2017.
Apple computers ship with a pre-installed suite of hardware diagnostic tools, known as Apple Hardware Test (AHT).
To create a bootable CD either use Disk Utility or right click on the DMG and use the "Burn Disc Image to Disk" opo-up option.
AHT.zip (210.66 MiB / 220.9 MB)
Apple Hardware Tests 2017 archive from GitHub / Zipped
Architecture: PPC + Intel
Emulating this? It should run fine under: QEMU