Found the following hamletworks.org entries referring to line 844

View Commentary Note for 842
842 Ham. Vppon my sword. {D4v}1.5.147

View Commentary Note for 844
844 Ham. Indeede vppon my sword, indeed.1.5.148

View Immaterial Textual Note for 844
844 Ham. Indeede vppon my sword, indeed.1.5.148

View Material Textual Note for 844
844 Ham. Indeede vppon my sword, indeed.1.5.148

View Material Textual Note for 845
845 {Ghost cries vnder the Stage.}1.5.149
845 Ghost. Sweare. <Ghost cries vnder the Stage.>

View Immaterial Textual Note for 846
846-7 Ham. {Ha,} <Ah> ha, boy, say'st thou so, art thou there {trupenny} <true- |penny>? 

View Material Textual Note for 847
847 Come {on,} <one> you heare this fellowe in the Sellerige,1.5.151

View Commentary Note for 857
857 {Sweare by my sword}1.5.159

View Commentary Note for 858
858 Ghost. Sweare {by his sword}.1.5.161