RX02 controller type DIP switches		John Wilson 02-Aug-1999

Settings for the 2-position DIP switch ("S1") on the M7744 microcomputer
board (the one on the top of the RX02 that swings up after you remove some
screws):

S1-1	S1-2	Interface
OFF	ON	RX211, RXV21  (normal setting for PDP-11 use as DY:)
ON	OFF	RX8E, RX11, RXV11  (RX01 emulation)
OFF	OFF	RX28  (i.e. non-DMA RX02)

Note:  the RX8E and RX28 are just marketing names, they both refer to the
same M8357 controller board which can drive either RX01 or RX02 drives.

Actual switch meanings:

S1-1	is read by the RX02 microcode, so who knows what it does, probably
	modifies the meaning of the fill/empty silo commands (although,
	maybe the DMA INTF pin (VV/40) is what does that)
S1-2	decides whether the RX DRV AC L signal (TT/pin 38) is really
	connected to the drive's AC-low signal, or just echoes RX INIT L
	(which comes from the host controller).  ON means AC-low IS ORed in.

John Wilson
D Bit