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Short Form Block ID
7
0
BOP
1
2
3
4
(MSB)
7
8
(MSB)
11
12
13
(MSB)
15
(MSB)
16
19
Returned data fields:
BOP
EOP
LOCU
BYCU
LOLU
PERR
Partition Number This will always be zero.
First Block
Location
Last Block
Location
128
Commands
6
5
EOP
LOCU (1) BYCU (1)
Partition Number (0)
First Block Location
Last Block Location
(same as First Block Location)
Number of blocks in buffer (0)
Number of bytes in buffer (0)
0
The current logical position is not at BOM (beginning of media).
1
The current logical position is at BOM.
1
The current logical position is within the EW-EOM region.
1
The number of blocks in the buffer is unknown.
1
The number of bytes in the buffer is unknown.
0
The Partition Number, First Block Location and Last Block Location fields are
valid.
0
No position error
1
There has been a position error caused by the overflow of some position field
data.
The number of blocks and filemarks from BOM to the current position. Counting starts
at zero, so BOM is block location 0.
Always set to the value of the First Block Location.
4
3
2
Rsvd (0)
LOLU (0)
Reserved (0)
Reserved (0)
1
0
PERR
Rsvd (0)
(LSB)
(LSB)
(LSB)
(LSB)
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