Wiktionary:About Old Khmer

Writing Systems
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The Latin script is the standard Indological transliteration of the original old Khmer script. Consequently, word-final implicit vowels are written even though they were, for the most part, probably not sounded. The old Khmer script almost never distinguishes &lt;b&gt; and &lt;v&gt;; the single character is written as &lt;v&gt;, except for a very few instances where a distinct &lt;b&gt; is written.

Thus, the array of consonants is:

The ten vocalic vowels are used in writing. There are some very rare examples of syllabic consonants; they will be added as occasion arises. The vowels are thus, with dependent vowels written on ក:

The independent vowel អ behaves as a consonant only in that it can take subscript consonants, in which case it is transliterated as the modifier letter apostrophe, U+02BC. The combination can take a dependent vowel, as in. When independent vowels are subscripted, the transliteration writes the glottal stop as an apostrophe, e.g. . Independent vowels in hiatus are also written with an apostrophe.

There is an alternative notation in which the independent vowel with a subscript consonant is written superscript (a) and the hiatus before a non-subscript independent vowel is marked with a hyphen.

៌|Robat acts like reph in the middle of a word (-Vr). It means to be put immediately over the next consonant. ៑|Viriam acts like virama at the end of a word, making a consonant halant.

On-line Resources
There is an on-line dictionary at SEAlang. The dictionary indicates word attested only as prefixes or suffixes by appending a degree sign. On Wiktionary, we use a hyphen, before or after as appropriate. A quick account of the orthography is given in 'The Handbook of Austroasiatic Languages' by Paul Sidwell and Mathias Jenny. There is a Google books preview accessible by searching for "Angkorian Khmer writing".