Emerson MVME147 Common Command Set And Disk Operation, Attribute Flags, Media, Type, Byte Offset

A

COMMON COMMAND SET AND DISK OPERATION

ATTRIBUTE FLAGS

MEDIA	ALL SECTORS	500K BITS/	MFM
TYPE	SAME BIT 7	SEC BIT 3	BIT 0	NOTES
12	0	0	1	5 ¼ in.,
				FM/MFM
				(VERSAdos
				double
				density)
	2.	The block length is taken from the attach
		packet, byte offset $1C, bytes per block.

The remaining 32 bytes that are transferred during the DATA OUT phase for the mode select command are the page 5 header and parameters. The header consists of the first two bytes listed below, the parameters are the remaining bytes.

Mode Select Parameter List: Page 5 Parameters

	BYTE OFFSET	VALUE	COMMENTS
0	5	Page code
1		1E	Page length
2		(Note 1)	Transfer rate (MSB)
3		(Note 1)	Transfer rate (LSB)
4		(Note 2)	Number of heads
5		(Note 3)	Sectors per track
6		(Note 4)	Bytes per sector (MSB)
7		(Note 4)	Bytes per sector (LSB)
8		(Note 5)	Number of cylinders (MSB)
9		(Note 5)	Number of cylinders (LSB)
	A	(Note 6)	Starting cylinder - write precomp
			(MSB)
	B	(Note 6)	Starting cylinder - write precomp
			(LSB)

A-18