Report: ISM 3.0 Keyboard Driver — Marathi 1. Executive summary ISM 3.0 is a keyboard driver implementation designed to provide robust input support for Indic scripts. This report evaluates ISM 3.0’s Marathi support: installation, layout design, rendering accuracy, compatibility, performance, user experience, and recommendations for improvement. 2. Scope and objectives

Assess ISM 3.0 driver for Marathi input correctness and usability. Test on common platforms (Windows 10/11, Ubuntu 22.04) and major applications (word processors, browsers, terminal). Verify mapping to Marathi orthography (Devanagari), ligatures, vowel signs, consonant clusters (conjuncts), nukta, anusvara, visarga. Produce actionable recommendations for developers and localization teams.

3. Methodology

Installed ISM 3.0 on Windows 11 and Ubuntu 22.04. Tested input in: Notepad/Word, LibreOffice Writer, Google Docs (browser), Firefox/Chrome textareas, GNOME terminal. Compared against reference Marathi keyboard layouts (InScript, Phonetic transliteration like Remington/Baraha/Google Input Tools). Checked Unicode codepoints produced, normalization, and rendering of complex conjuncts using Devanagari fonts (Noto Sans Devanagari, Lohit Devanagari). Collected qualitative usability feedback from 3 native Marathi typists.

4. Findings 4.1 Installation & Setup

Installer provided Windows package and Linux tarball; Windows installer integrates with system IME; Linux required manual registration with IBus on Ubuntu. Setup documentation is present but sparse for non-technical users; no GUI configurator for Ubuntu.

4.2 Layout and Input Mapping

Default layout: hybrid between InScript and phonetic mapping. Strengths:

Common Marathi characters (अ–ह, vowels, matras) accessible. Nukta, anusvara, visarga present.

Issues:

Some less-frequent conjuncts require multi-step keystrokes that are inconsistent with InScript expectations. Phonetic mapping differs from widely-used Marathi phonetic schemes, causing learning friction for users migrating from Google Input Tools or Remington. Deadkey behavior for matras occasionally inconsistent across applications.

4.3 Unicode Output & Normalization