Bishop's holodisk is a holodisk in Fallout 2.
Location
Shark Club, in the (trapped) safe in Bishop's room.
Transcript
This holodisk contains incriminating information on Bishop's secret deal with NCR. Apparently, Bishop hired mercenaries to attack Vault City in the hopes that Vault City would turn to NCR for military aid. This holodisk is audio only and has no text data. Vault City might be interested in this.
Gallery
This safe contains Bishop's holodisk and the raiders map