Found the following hamletworks.org entries referring to line 81

View Commentary Note for 11
11 Bar. Tis now strooke twelfe, get thee to bed Francisco,1.1.7

View Commentary Note for 81
81 Mar. Thus twice before, and {iump} <iust> at this dead houre,1.1.65

View Immaterial Textual Note for 81
81 Mar. Thus twice before, and {iump} <iust> at this dead houre,1.1.65

View Material Textual Note for 81
81 Mar. Thus twice before, and {iump} <iust> at this dead houre,1.1.65