From Apples Technote HW 540...The only release where I have kernel source code runs only onthe original Mac II and does not support all the hardware and periphals.
Currently A/UX is only OS to use Macintosh IIfx SCSI DMA chipDate Written: 8/15/91
Last reviewed: 8/15/91
Does System 6.0.7 or 7.0 make use of the DMA portion of the Macintosh IIfx hardware?
System 7.0, or any version of the Macintosh operating system at this point, does not utilize the SCSI DMA chip in the Macintosh IIfx. A/UX is the only operating system on the Macintosh that does use this chip.