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COMMON COMMAND SET AND DISK OPERATION
A-18
A
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
120015 ¼ in.,
FM/MFM
(VERSAdos
double
density)
2. The block length is taken from the attach
packet, byte offset $1C, bytes per block.
BYTE OFFSET
VALUE COMMENTS
0 5 Page code
11EPage 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)
ATTRIBUTE FLAGS
MEDIA
ALL SECTORS 500K BITS/ MFM
TYPE
SAME BIT 7 SEC BIT 3 BIT 0 NOTES