PLANET DSP-1000 - Manual (Page 50)

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Create a text file and add up to 5 lines, each with up to 12bytes.
Depending on when you would like to show this message, rename the
text file with a two digit number from 00~23 and then store it in the “info”
directory.
As an example, to display the message from 3-4PM, name it “15.txt”. To
display the same message from 3-5PM, create another copy of the same
text file, name one “15.txt” and the other “16.txt”. If there is no text file for
that particular hour, it will instead display the date, time and weekday.