This is one of over 4625 effects generated by Filter Forge, a Photoshop plugin that allows you to create your own filters.
To open this filter, you must have Filter Forge 2.0 or higher installed on your computer. If you don't have it installed yet, click here to download Filter Forge
This takes a predefined message defined at the start of the Lua code which you can change. All ascii characters are supported.
Text, Dot Matrix, ASCII, Copyright, Watermark, Character