LV-ROM

LV-ROM
Media type	Read-only optical disc
Encoding	Pulse-width modulation (analog)
Capacity	324 megabytes of digital information, or 54,000 frames of PWM-encoded analog video (per side)
Read mechanism	Laser diode
Developed by	Philips
Dimensions	30 cm (11.81 in)
Usage	Interactive media
Extended from	Laserdisc
Extended to	LD-ROM

LV-ROM is an optical disc format developed by Philips Electronics to integrate analog video and computer software for interactive multimedia. The LV-ROM is a specialized variation of the CAV Laserdisc. LV-ROM is an initialism for "LaserVision Read-Only Memory".

Like Laserdisc, LV-ROM discs store analog audio and video by encoding it in pulse-width modulation. However, LV-ROM also stores computer files via the Advanced Disc Filing System, which is the file system used by Acorn Computers. An LV-ROM disc can store up to 324 megabytes of digital information, or up to 54,000 frames of analog video^[1] (36 minutes with a frame rate of 25 fps) per side.

The format had only one application: to publish documentary video, children's writings, and other historical records compiled from 1984 to 1986 for the BBC Domesday Project.^{[disputed – discuss]} The Domesday Project LV-ROM discs were played using a BBC Master computer connected via SCSI-1^[2] to a Philips AIV VP415 Laserdisc player.^[1] A genlock enabled the software stored on the LV-ROM to display computer graphics over the analog video on the BBC Master's computer screen. The buttons and menus of the user interface were accessed with a trackball. The Philips VP415 was shown in the 1989 James Bond film: “License to Kill”.

^ ^a ^b Rhind, David; Openshaw, Stan (1986). "The BBC Domesday System: A Nationwide CIS FOR $4448" (PDF). Archived from the original (PDF) on 15 March 2016. Retrieved 13 April 2013. {{cite journal}}: Cite journal requires |journal= (help)
^ The BBC Master, introduced by Acorn Computers in 1986, was one of the first home computers to feature the new SCSI-1 parallel communications bus.

[rhind-openshaw-1] Rhind, David; Openshaw, Stan (1986). "The BBC Domesday System: A Nationwide CIS FOR $4448" (PDF). Archived from the original (PDF) on 15 March 2016. Retrieved 13 April 2013. {{cite journal}}: Cite journal requires |journal= (help)

[2] The BBC Master, introduced by Acorn Computers in 1986, was one of the first home computers to feature the new SCSI-1 parallel communications bus.

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