I/O Boards

Series 900 with rev DD I/O and IPI controller using Series 6 cpus
	doesn't work.  NEEDs higher I/O : "DR" known to work

Series 600 with DD I/O and SMD controller is flaky with Series6 (maybe Series5)

Series 500 with AJ rev I/O and Series 6 causes MXCC failures.

Disks

Fujitsu M1606S on KBus
	f/w 6226 works
	f/w 6237 causes BAD TRAP at kernel probe/label inquiry on KBus
		(may work at certain I/O board revs, not sure)
Seems fine on IDT

Quantum Viking seems fine on IDT, most Quantums aren't fine