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B.
Automatic Mode
In Automatic Mode, operation of the videodisc player is
controlled by the application program stored in RAM.
This mode is initiated by the successful loading of a
program dump, or with the RUN command.
If the user wishes
to begin program execution at a specific memory location,
he enters the location number and then the RUN command.
If no location is specified, program execution begins
at location 0000.
_,
Input during Automatic Mode is limited to the following:
o
Audio Control.
Both Audio channell and Audio 2
outputs are normally turned on when the player enters
Automatic Mode.
The viewer may toggle Audio 1 and
Audio 2 ON or OFF, undetected by the application
program.
The fifteen Axx commands can be used to
set the state of either or both audio output channels.
A command to toggle ex* ON/OFF is also available.
However, if the disc is encoded with automatic ex
control codes, they take priority over the commands.
o
Frame Display.
The display of frame numbers is turned
off when the player enters Automatic Mode.
The viewer
may toggle this display ON and OFF with the DISP
command, undetected by the application program.
,,..
o
Viewer Response.
If the application program has
been written to allow viewer interaction, it will
normally request this interaction by presentihg a
statement or question, followed by
multiple~choices.
The viewer may, at that time, make the numeric entry
that corresponds to his choice (0 ••• 9) '.' The subsequent
path of program control is altered by that choice.
o
Mode Termination.
The user may terminate Automatic
Mode by"issuing either the HALT or the REJECT command.
A HALT command ,returns-the player to Manual Modej
however, the player may continue in motion 'until
the STOP button is pressed, depending on the program
command which was being executed at the time of the
HALT.
A REJECT operates as discussed previousl.Y. _.
for Manual Mode.
*
ex is a trademark of CBS, Inc.
TPl09 Version 2.0
- 6 -
April'1984
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