I’ll see if I can try my MDD G4 and my G5 in the next few days.
First time posting here — thanks so much for the work on Tabby, it’s great to see PPC getting this kind of attention. Wanted to share a test report in case it’s useful.
Tested on a PowerBook G4 12" (PowerBook6,2, BootROM 4.7.5f1), Tabby hrev59853+146+dirty.
USB-booted the installer fine (needed probe-all before OF would see the stick, and a single backslash in the boot path rather than \\). Install to internal HDD completed cleanly, 347/347 packages.
Booting from the installed HDD panics 100% of the time, right at “Mounting boot disk” — reproduced twice with the identical object address and identical stack trace, so this looks fully deterministic rather than a racy heap issue:
Panic trace (ASSERT FAILED, Slab.cpp:1340)
PANIC: ASSERT FAILED (../src/system/kernel/slab/Slab.cpp:1340): *(uint32*)object == 0xdeadbeef; object 0x84e3e080
Thread 14 "main2" running on CPU 0
stack trace for thread 0xe "main2"
frame caller <image>:function + offset
9024f9f0 802267b0 kernel_ppc:object_cache_alloc + 0x0264
9024fa20 80282d9c kernel_ppc:strdup + 0x0038
9024fa40 801d121c kernel_ppc:_ZN8BPrivate10DiskDevice11KDiskSystemC1EPKc + 0x007c
9024fa60 801d2518 kernel_ppc:_ZN8BPrivate10DiskDevice11KFileSystemC1EPKc + 0x0034
9024fa80 801cfe68 kernel_ppc:_ZN8BPrivate10DiskDevice18KDiskDeviceManager18_RescanDiskSystemsERNS1_13DiskSystemMapEb + 0x0144
9024fae0 801d004c kernel_ppc:_ZN8BPrivate10DiskDevice18KDiskDeviceManager17RescanDiskSystemsEv + 0x009c
9024fb30 801d0400 kernel_ppc:_ZN8BPrivate10DiskDevice18KDiskDeviceManagerC2Ev + 0x0240
9024fb60 801d0500 kernel_ppc:_ZN8BPrivate10DiskDevice18KDiskDeviceManager13CreateDefaultEv + 0x007c
9024fb80 8020dd00 kernel_ppc:vfs_mount_boot_file_system + 0x03a0
9024ff80 8011c438 kernel_ppc:_ZL5main2Pv + 0x00a8
Also saw a one-off panic during the post-install restart (page fault touching 0x0000001c in the “shutdown worker” thread) — only happened once, didn’t chase it since the HDD-boot panic above blocked further testing anyway.
Restart panic (single occurrence)
PANIC: page fault, but interrupts were disabled. Touching address 0x0000001c from ip 0xff848340
Thread 435 "shutdown worker" running on CPU 0
srr0 0xff848340 srr1 0x00003030 dar 0x0000001c dsisr 0x40000000
vector: 0x300
Happy to test more if it’d help narrow this down.
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This report is extremely useful, thank you!
I had only a panic while “mounting Bootdisk” when I did boot in my 15" PowerBook G4 from usb0
On my PowerBook G4 the boot seem only to work e.g. starting to Desktop from usb1 
I tried it on my A1046 G4 PowerBook5,2 (sic) with no luck — it dumps into KDL while trying to mount the root filesystem; screenshot below. The good news is that it behaves identically booting from either USB or CD (I was too chicken to try it on the real hard drive).
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At long last, i can finally have some haiku fun with all the powerpc mac towers and laptops i have stacked around the place, neat.
thanks for this!!
I have exactly this error at this point when I do boot the image via USB Stick in USB0.
But when I use the other USB port (usb1) in my PB G4 15" then the PB does mount the Boot Disk.
Try the other USB Port:
boot usb1/disk@1:,\haikuloadder.elf
But mine is missing the Trackpad-Support and has a ATI Radeon 9700 not a Nvidia 5200 like the 12" models which get a real GFX driver in tabby
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Is there any chance this will ever be implemented for G5s? They are a lot faster than their 32-bit counterparts. When I booted it on my iMac G5 iSight, it just kept mapping memory in OF with no stop, so something is wrong there for sure.
I do plan on getting this working on G5
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To follow on from someone’s wallpaper project, I had some fun coming up with a loose logo concept for TabbyOS as well. Tabby cat stripes aren’t as “rectangular” as this but it was a five minute concept knock-up in Inkscape. The inspirations should be obvious.
Thought it would be a fun idea for a sticker logo. All copyright/trademark/etc is hereby assigned to whoever is behind TabbyOS.
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(I’m not expecting this to replace the black pawprint. Just a bit of fun in between more productive tasks.)
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Can you also try to port the arctic fox browser for ppc ?
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the Flower Power units will be back ! 
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Would like to know how well it runs on that thing. Like how’s the performance? Also I see Sauerbraten installed, how well does that run? Also, how’s the G5 progress going?
Is there a newer USB installer image available?
Also, I would ultimately like to set it up to build locally if possible. Do you have instructions? Are you cross compiling from Linux or some other OS?
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Tabby-powered. Love it.
Power Mac G5 seals the deal for me! 
Thought this image was more PowerMac-ish…
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Was this image AI-generated?