Code page 771 (also known as CP 771 or "KBL") is a code page used under DOS to write the Lithuanian and Russian languages.
Code page layout
Each character is shown with its equivalent Unicode code point and its decimal code point. Only the second half of the table (code points 128–255) is shown, the first half (code points 0–127) being the same as ASCII.
References
Code page 771 Wikipedia(Text) CC BY-SA