The Armenian orthography reform occurred between 1922 and 1924 in Soviet Armenia and was partially revised in 1940. Per Dr. Jasmine Dum-Tragut in Armenian: Modern Eastern Armenian, "The main features of the orthography reform of 1922 were the neutralization of classical, etymological writing and the adjustment of phonetic realization and writing..."[1]
This orthographic reform is not to be confused or associated with the 13th-century alphabet extension introducing letters ⟨օ⟩ and ⟨ֆ⟩.
The original orthography is now known as the classical orthography (Armenian: դասական ուղղագրութիւն dasakan uġġagrut'yun) and is sometimes referred to as Mashtotsian orthography (մաշտոցեան ուղղագրութիւն), after Mesrop Mashtots, who invented the Armenian alphabet in 405 AD.