$ and ! symbols

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I've been searching around the interwebs for a while, but I can't seem to find what the $ and ! symbols before some charsets mean. When are they needed, and what exactly do they do?

[TDS]

The size for 1 character includes 4 directions (down, left, right, and up) and 3 patterns for a total of 12 patterns in a set order. One file should contain 2 characters vertically and 4 horizontally, for a total of 8 characters. The size of one character is calculated to be 1/12 the width and 1/8 the height of this file.

Note that in order to make overlapping with buildings appear more natural, characters are displayed 4 pixels above the tiles.

You can disable this effect by putting a "!" at the beginning of the file name. This is mainly used for object-type characters on the map, such as doors and treasure chests. It is possible to use this in conjunction with the special symbol "$".

If you put a "$" at the beginning of the file name, only one character per file will be used. In this case, the character size is 1/3 the width and 1/4 the height of the file. It is possible to use this in conjunction with the special symbol "!".

From the help file.

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Ah...I never thought to look at the help file...thanks.