Found the following hamletworks.org entries referring to line 831

View Immaterial Textual Note for 829
829 Ham. Yes by Saint Patrick but there is {Horatio} <my Lord>,1.5.136

View Immaterial Textual Note for 830
830 And much offence to, touching this vision heere,1.5.137

View Commentary Note for 831
831 It is an honest Ghost that let me tell you,1.5.138

View Immaterial Textual Note for 831
831 It is an honest Ghost that let me tell you,1.5.138

View Material Textual Note for 831
831 It is an honest Ghost that let me tell you,1.5.138

View Immaterial Textual Note for 832
832 For your desire to knowe what is betweene vs1.5.139

View Immaterial Textual Note for 833
833 Oremastret as you may, and now good friends,1.5.140