Pioneer Industrial DVD Player DVD-V7400 - Manual (Page 92)

Internal Registers
8.15 Mark Title/Track (Mark Chapter)
The register contains the Title/Track (mark Chapter) as a marker.
The function is identical to the Mark Time/Frame command (refer to 8.14).
8.16 Mark Index
The register contains the Index number as a marker.
The function is identical to the Mark Time/Frame command (refer to 8.14).
8.17 Video Control
The player uses the register to control the Video ON/OFF switch.
8.18 Audio Control
The player uses the register to select the audio output.
8.19 Display Control
The player uses the register to toggle the Character Display switch ON/OFF.
The Character Display tracks on-screen information such as Time/Frame
number, Title/Track number, etc.
8.20 Registers
There are three (3) registers, A B and D. The registers are reserved exclusively
for CPU internal operations.
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