Technical information
SEGA Confidential
52
• Atime (Absolute Time)
When a command is received that has an access position as its parameter, that
parameter value is displayed. The format is mm:ss:ff, where mm is minutes, ss is
seconds, and ff is frames. For commands that do not have an access position, the
parameter 00:00:00 is displayed.
• FAD (Frame address)
Displays the absolute time in terms of frames, either in decimal or hexadecimal
numbers (default setting is in decimal format). For example, when the absolute
time displayed is 00:02:15, this field is displayed as 165 (75 x 2 + 15). "FAD (10)"
denotes the display of data in decimal format.
• Message
Displays the number of
NOP commands and the number of data transfer frames.
The number of
NOP commands is determined by counting the number of NOP
commands issued between other commands. The value shown in the current line
indicates the number of
NOPs received since the last command and the current
command. The number of frames is determined by counting the frames trans-
ferred to the VCD interface board from the receipt of the command that initiated
the data transfer to the current command acknowledged by the system. Accord-
ingly, this value is greater than the numbers (default setting is in decimal format)
received by the target box.
• Status
This shows the status of the VCD interface board when it receives a command.
Otherwise, “StatusPREFD" is displayed. It is a sequence of five 0s or 1s in
varying combinations depending on system status. Their meaning, from left, is
as follows.
• 1 indicates Play. This digit is always 0. It is not set by the VCD interface board.
• 1 indicates Ready. This digit is 1 if the system is normal.
• 1 indicates Error. It means that some kind of error has occurred.
• 1 indicates DiskEnd (Finish). It is always 0. It is not set by the VCD interface board.
• 1 indicates DmaEnd. It is used during playback to indicate the end of data transfer.
Other Messages
Other messages, such as error messages, are not assigned to fields.
4.2 Menu Screen Functions
Menu in the top bar is highlighted when the SPACE bar is pressed. Menu and Help can be
selected with the LEFT and RIGHT cursor. If ENTER or the DOWN cursor is pressed,
the content of the selected menu appears.