ZiLOG System 8000 Hardware Reference Manual

HRM ..
.lilog
HRM
CONTAG- This signal enables the following individual con-
trol bits and must be true for the entire control operation.
1. Write Gate (Bit 0)
2. Read Gate (Bit 1)
The Write Gate line enables
the write driver.
Enables the digital read data
on the transmission lines.
3. Servo Offset + (Bit 2)
When true, the
offset from the
Cylinder position
spindle.
actuator
nominal
toward
is.
On
the
4. Servo Offset - (Bit 3)
When true, the
offset from the
Cylinder position
the spindle.
actuator is
nominal On
away from
5. Fault Clear (Bit 4)
A pulse is sent to the device
to clear the fault if condi-
tion no longer exists.
6. AM Enable (Bit 5)
The Address Mark (AM)
tog~ther with Write
Read Gate allows the
or recovering of
marks.
Enable
Gate.or
writing
address
7. RTZ ( Bi t 6)
A Return to Zero (RTZ) pulse
when sent to the device will
cause the actuator to seek
track 0, reset the head regis-
ter, and clear the Seek Error
flip-flop.
8. Data Strobe Early (~it 7) When true, ,the device PLO Data
Separator will strobe data at
a time earlier than normal.
9. Data Strobe Late (Bit 8) When true, the device PLO Data
Separator will strobe the data
at a time later than normal.
10. Bit 9 Reserved
SECTOR - The sector mark is derived from the servo track.
Timing integrity is maintained throughout seek operations.
The number of sectors per revolution is switch selectable
and determined by dibits/sector clocks.
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Zilog
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ZiLOG System 8000 Specifications

General

Brand	ZiLOG
Model	System 8000
Category	Desktop
Language	English