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A-18
HP 9895A Disc Memory Command Set
Stat 2
Bit#
•
15
TTTT
12-9
A
7
w
6
E
4
F
3
c
2
Meaning
Stat 2 error. This bit is set if one or more of the following
bits are set in stat 2:
1. Drive fault,
2. Seek check,
3. Any drive not ready error.
(See code 10011 in Sl table for list of possible causes.)
Disc type. These four bits Indicate the type and format of
the disc currently present in the selected drive as follows:
0000 - Empty drive
0001 - Blank or unknown format, single-sided
0010 - HP format, single-sided
0101 - Blank or unknown format, double-sided
0110 - HP format, double-sided
1000 - lBM format, single-sided
Attention. This bit is set when a seek completes (success-
fully or unsuccessfully), or following an End command
when stat 2 changes. It is cleared after the status is read.
Write protected. The disc in the selected drive has the
write protect notch present.
Drive fault. This bit is set after the following occurs:
1. Drive goes not ready after End command,
2. Drive goes not ready during data transfer,
3. Hardware failure.
Drive fault is cleared after the status is read.
First status bit. This bit is set when a disc is present in the
selected drive after:
1. Power on,
2. The door is closed,
3. Self-test completion.
First status is cleared after the status is read.
Seek check. This bit is set when a seek fails for one or
more of the following reasons:
1. An out-of-bounds target sector was specified,
2. An attempt was made to access a non-existent phys-
ical track,
3. The seek algorithm could not find the target logical
track.
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