Model: PowerBook Duo 280
PMU v2 ADB: OK.
5380 SCSI: OK but lacks DMA support on Mac IIfx.
SWIM floppy disk controller: Not working on PowerBooks.
Many low-end Macs were fitted with a defective 68LC040 processor.
(Penguin can tell you the type of processor in your Mac.)
See the FAQ for information about this issue.
Please send corrections and new results to the linux-m68k or debian-68k mailing list.