Old Turkic is written from right to left.
Hard consonants (for back vowels: a, o, u, ı) are on the first row.
Soft consonants (for front vowels: ä, ö, ü, i) are on the second row.
To type directly with the computer keyboard:
Download & install the font Noto Sans Old Turkic
→ Turkic languages of Central Asia & Old Turkic
→ Hungarian runes keyboard (Old Hungarian): a related runiform script from the same steppe tradition
→ Turkish keyboard (Latin script)
→ Ottoman Turkish keyboard (Arabic script)
→ Latin script keyboard: special characters for any language
→ Multilingual keyboard: a wide range of scripts