Around 1993, Sunil Koswatta created a bitmap Sinhala font for use on Macs. Wijesuriya Pubudu Dayawansa wrote a perl script to convert "samanala" documents into LaTeX. Vasantha Saparamadu converted the Mac font into a font that can be used by Latex, and combined all bits to create a sinhala software package which converts anything written in English characters using samanala transliteration scheme into a postscript file showing Sinhala characters.
In 1995, we discovered that a Sinhala TeX software (with a proper font) has been developed by Yannis Haralambous, with funding from the Wellcome Institute for the History of Medicine, 183 Euston Road, London NW1 2BE, England (Contact person: Dominik Wujastyk), which is using the font in its Catalogue of Sinhala Manuscript. It is available at ftp://ftp.bcc.ac.uk/pub/users/ucgadkw/indology/software/sinhala1-TeX.zip
It was later modified by Vasantha to add support for Prasad's "samanala" transliteration scheme.