Post #2098435
2026-05-03 21:31 UTC
i bought another powerpc mac laptop
all the pre-pci powerpc macs, as far as i can tell, have similar MMIO and identical cascaded interrupt controllers (inherited from the late 68k era it appears - this system uses a chipset identical to an earlier 68k powerbook, except with a newer graphics controller revision - probably to support 800x600x16bpp), so I hacked in powerpc 601 support to the loader and arc too, and it boots on emulated PDM (NT 3.5 PPC emulation soon?)
actually writing drivers for this thing is going to be fun. half the chipset is undocumented and what is documented is just what's in the old mklinux sources.
Replies (3)
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@Rairii@labyrinth.zone 2026-05-03 21:36
the funny thing is the mklinux sources call this chipset "M2" (the codename of the first powerpc laptop using it) M2 mac before it was cool
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@comp_ed82@mastodon.social 2026-05-03 21:55
@Rairii You can do this... We believe in you! 💪
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@bakkus@bitbang.social 2026-05-04 13:47
@Rairii@labyrinth.zone There was once upon a time a Linux kernel patchset for these 1st generation PowerPC Nubus based macs. Perhaps you could glean from there: https://sourceforge.net/projects/nubus-pmac/ (there are GitHub mirrors here and there) + https://nubus-pmac.sourceforge.net/