Mandome was invented in 1978 by David Wabeladio Payi, in Dem. Rep. of Congo. It was used at its beginning mainly by the Kimbanguist church in DRC for writing Kongo. Mandombe can also be used to write Lingala, Swahili, Tshiluba and most tonal languages and even European languages such as French.
It is not encoded in Unicode, but
- an initial proposal was submitted by CENA in late 2010: http://www.unicode.org/L2/L2011/11053-mandombe.pdf
- a current proposal was submitted in April 2015 and revised in July 2015: http://www.unicode.org/L2/L2015/15118r-mandombe.pdf
Mandombe is apparently not yet added to ISO-15924.
An example in Kongo can be seen at: http://www.hapax.qc.ca/pdf/notre-p%e8re-kikongo.pdf
There were websites on Mandombe at mandombe.info and mandombe.org, but these are now offline.
Il y a une explication et un tableau des transformations sur Wikipedia
There also exists a simplified Mandombe script: Sakwameso perso.wanadoo.fr/kimbangu.net/Mandombe%20en%20Sakwameso.htm (page offline). References to this and how it is simplified have been hard to find. (The above link was seen on the French Wikipedia page in 2007.)
- Script Source, "Unicode Status (Mandombe)" http://scriptsource.org/entry/v886dhystc