HP 9845B/C CE Service Manual

HP 9895A Disc Memory Command Set A-7
2. First Status State
This state is entered for a particular drive after:
a. A disc
is inserted in the drive during normal operation,
b. The 9895A is powered up with a disc in the drive,
c. The 9895A is issued an Initiate Self-Test command, with a disc in the drive.
When this state is entered, a flag in the status 2 word for the drivers) affected is set. All
operations requiring access to the newly inserted disc are disabled until the status of
the drive is requested or the Cold Load Read command is issued.
The holdoff ensures that the HP-IB controller is aware that the disc is a newly inserted
one before ifis actually accessed. In addition, the first request of status for that drive
will cause the device to find out the format of the newly-inserted disc, thereby enabl-
ing proper use of the disc.
Commands not executed while first status is set are:
a.
Read commands
b. Write commands
c. Verify
d. I
ni tialize
e.
Format
f. Seek
It should be noted that after a power-on has occurred or after the execution of the
Initiate Self-Test command, the DSJ is set to 2 and the first status bit is set for any
drive containing a disc. Thus, both holdoffs, DSJ and first status, will be in effect.
Therefore, to enable access to a disc, two command sequences may be used. They
are:
a. A DSJ
or Clear followed by a Status command,
b. A Cold Load Read command.

HP 9845B/C CE Specifications

General

Brand	HP
Model	9845B/C CE
Category	Storage
Language	English