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Explanation: One or several dumps can be loaded while a motion sequence is playing.
In effect, loading the program is hidden under a motion segment, providing an "invisible
load". Like LOAD, the MLOAD command loads a 1022-byte program dump from the
videodisc. However, the data may be put into any of the currently active pages of
memory. Thus, the command must have an argument specifying the page (0 - 6) into
which the "dump" information will be loaded. The command does not affect the contents
of Register 0 or the Active Register Pointer.
When the MLOAD command is executed, AUDIO 2 is temporarily muted. Valid program
leader must be detected for the MLOAD to continue. It is not necessary for AUDIO 2 to
be turned "ON". While "listening" for data, the player is forced to PLAY forward if it is not
already doing so. The VIDEO and AUDIO 1 squelch status are not changed. Thus,
dumps could be loaded while a motion sequence is playing. After the MLOAD, the player
reverts to the mode it was in before the MLOAD was executed. Program execution
continues at the program address immediately following the MLOAD command. Thus, an
MLOAD would usually be used to load data only into another page, not the page that is
currently executing code.
If dump leader is not detected, or the load is not successfully completed, the player does
not retry the MLOAD. Branch on Failure (BRF) is used to detect the failure.
Note: The argument is taken modulo 256. The command is ignored if the argument
specifies a page that is not active. The player may not properly process commands
received while it is loading a program dump from a videodisc.
Example: Load the dump at frame 100 into Page 3 (of pages 0 - 6). "Invisible Load" the
dump at frame 450 into Page 2 while playing from 450 to 600. In both cases, if loading
fails, Branch to program address 200.
Address
Pioneer LD-V8000 Level II User's Manual
Argument
50
51
52
100
56
3
58
59
200
100
450
104
105
2
107
200
111
600
LD-V8000 Level II • Chapter Four
Command
Hex Code
VOFF
AFF
SEARCH
MLOAD
STOP
BRF
SEARCH
PLAY
MLOAD
BRF
AUTOSTOP
TP 114 v. 1.1
•
8/92
MLOAD
(cont.)
1C
A0
F7
CC
FB
07
F7
FD
CC
07
F3
4-7
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