|Widget_Servo_Functional_Objective.pdf||WIDGET SERVO FUNCTIONAL OBJECTIVE
I. BASIC SERVO FUNCTIONS
Widget servo-control functions are handled by a Z8 microprocessor. The
Z8 handles all I/O operations, timing operations and communication with a
host controller. Control functions to the Z8 Servo Controller are made
through the serial I/O.
The following commands for the Widget servo are:
A. HOME - not detented, heads off data zones located at the inner stop.
B. RECAL - detented at one of two positions.
1. FORMAT RECAL: 32, -0, +3 tracks from HOME use only during data
2. RECAL: 72, -0, +3 tracks from HOME use to initialize home pOSi-
tion after power on or following an access or any other error.
c. SEEK - coarse track positioning of data head to any desired track
D. TRACK FOLLOWING - heads are detented on a specific track location and
the device is ready for another |