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Chapter Four • LD-V8000 Level II
LOAD
MLOAD
(cont.);
Program dump data is stored as a specially constructed "tone" on Audio Channel 2.
Data bits are recorded at 5000 bits per second and span approximately 50 frames of
Audio Channel 2. The combined leader tone, data, and buffer zone may occupy 2 to 3
seconds of Audio Channel 2. Thus, approximately 2 to 3 seconds are required to load a
1022-byte "page" of data.
Information regarding the recommended positioning and spacing of multiple program
dumps may be obtained from Pioneer Video Manufacturing, Inc. Also, refer to Section
3.3, Level II Programs Encoded on Videodisc on page 3-10 of this manual.
Upon successful completion of the load operation, the audio and video squelch status are
returned to the state they were in before the load was executed. Then, program execution
continues at program address 0.
If the load is unsuccessful (for example, a checksum error), the player retries the load
operation up to eight times. If the load operation still fails, or no leader tone was detected
at the target frame, the player returns to Manual Mode operation.
Note: The player may not properly process commands received while it is loading a
program dump from a videodisc.
Example: A dump that has it's target frame (covered by leader tone) at frame 450 is
loaded into Page 0 and the program execution is to resume at Address 0. The player
searches to frame 450, finds the leader tone, and then loads the data. Since there is no
argument before the Load command, the player will automatically resume executing
program instructions at program address 0. Also show a program segment which passes
a parameter (the value "13") in Register 0 to the loaded program.
Address
3) MLOAD (Moving Load)
Function: This command loads a 1022-byte dump into the indicated page.
Argument
Integer
4-6
Argument
100
450
104
200
201
13
204
100
Hex Code
CC
TP 114 v. 1.1
Command
SEARCH
LOAD
VOFF
GET
BRANCH
Mnemonic
L
Pioneer LD-V8000 Level II User's Manual
•
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Hex Code
F7
CC
1C
08
CF
RCU Buttons
Play, C, C
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