Bdscr - Alarum

The first word is unmistakably a Middle-to-Early Modern English variant of alarm . Derived from the Old French alarme (itself from the Italian all'arme — "to arms"), "alarum" was the preferred spelling in military and theatrical contexts from the 15th to 17th centuries.

I think you meant "Alarum, bedscore" or more likely "Alarum, bedscrew" and then I think I understand: A piece for Alarum/Bedscrew from John Donne's poem. alarum bdscr

In a hybrid system (e.g., a digital audio workstation for theater sound or a legacy military alert system), BDSCR is a register or buffer. "Alarum BDSCR" would then be a status dump: "Alert: Breakpoint Debug Status Control Register tripped" – a machine’s cryptic way of saying "A programmed warning condition has occurred." The first word is unmistakably a Middle-to-Early Modern