Hunmin Jeong'eum is the basis of modern Korean written script. Some of the letters have become obselete, but they are included in the computer encoding for Korean, and thus, they are also found as glyphs in Unicode.
When the new script was proclaimed, a version in written Chinese was written. In the Korean version, a mix of hangeul and Chinese characters were used, including the marks used for indicating the tones.
See Taiffalo's site for the scans where the following text is taken from. He also includes scans in Korean hangeul as well.
This page was created on Wednesday 23rd April 2003.