The Old Kannada is essentially the continuation of the Kadamba script. It is used to write South Indian languages of Kannada and Telugu. In fact, Old Kannada is also known as the Kannada-Telugu script.
Differentiation of the Old Kannada script into the modern scripts of Kannada and Telugu began as early as the 13th century CE, but the process did not finish until the early 19th century CE with the arrival of printing. Even so, Telugu and Kannada scripts have remained extremely similar.
The following is the Old Kannada script.
Note: Old Kannada is also known as Old Kanarese.