You're looking for information on the Kal 001 Tamil font keyboard layout!
Maintain Compatibility: The Kal 001 layout likely aims to be compatible with standard keyboard hardware, making it easy for users to adopt without needing specialized keyboards.
How to install and use:
For detailed character-to-key mappings used in older fonts, the Mylai Tamil Font Keymap offers a similar technical breakdown. How to Use Legacy Fonts tamil-key-board-layout.pdf - kalvisolaionline