Emerson MVME147 manual Single track density

			Attach/Detach Packet (all devices)
	........	......0.	Single track density
			(media TPI = ½ drive
			TPI,
			double step)
	........	......1.	Double track density
			(media TPI = drive
			TPI)
	........	........	Reserved
	........	....0...	250K bits/sec data
			rate (5¼ inch)
	........	....1...	500K bits/sec data
			rate (8 inch)
	........	...0....	Floppy media
	........	...1....	Rigid media
	........	..0	No reserve on attach;
			no release on detach
	........	..1	Reserve on attach;
			release on detach
	........	.0	Non-buffered seeks
	........	.1	Buffered seeks
	........	0	Standard IBM format,
			256b sectors are 128 in
			track 0
	........	1	Non-standard; all
			sectors same size,
			even
			track 0
	.......0	........	Soft-sectored media
	.......1	........	Hard-sectored media
	......0.	........	Fixed media drive
	......1.	........	Removable media
			drive
	........	........	Reserved
	....0...	........	Zone = track
	....1...	........	Zone = cylinder
$12	xxxxxxxx		Controller type (refer
			to controller type
			table)

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