Evilspeak (1981)

The clumsy military cadet Stanley Coopersmith is orphan and completely outcast in the West Andover Academy. He is frequently abused and humiliated by four despicable mates, and has a bad treatment from his teachers, the coach, the colonel and even from the local reverend. When Coopersmith finds a book of black mass that belonged to the evil medieval Father Esteban, he uses a computer to conjure Satan and revenge his harassers.

Evilspeak is a horror movie featuring Clint Howard.

Evilspeak is currently streaming for free (ad-supported) on Plex and Plex Player and it's also available on AMC+, AMC+ Amazon Channel, Shudder and Shudder Amazon Channel.