Information:  - Roberta Williams (born February 16, 1953) is an American video game designer, writer, and a co-founder of Sierra On-Line (later known as Sierra Entertainment), who developed her first game while living in Simi Valley, California. She is most famous for her pioneering work in the field of graphic adventure games with titles such as "Mystery House", the "King's Quest" series, and "Phantasmagoria". She is married to Ken Williams and retired from her career in 1999. Roberta Williams is one of the most influential PC game designers of the 1980s and 1990s, and has been credited with creating the graphic adventure genre.  - MS-DOS (; acronym for "Microsoft Disk Operating System") is a discontinued operating system for x86-based personal computers mostly developed by Microsoft. It was the most commonly used member of the DOS family of operating systems, and was the main operating system for IBM PC compatible personal computers during the 1980s and the early 1990s, when it was gradually superseded by operating systems offering a graphical user interface (GUI), in various generations of the graphical Microsoft Windows operating system by Microsoft Corporation.  - Sierra Entertainment (previously Sierra On-Line, commonly referred to as Sierra) is an American publisher founded in 1979 as On-Line Systems by Ken and Roberta Williams. Based in Oakhurst, California and later in Fresno, California, the division is now owned by Activision, a subsidiary of Activision Blizzard.  - The Colonel's Bequest is a character-driven graphic adventure game by Sierra On-Line. It was developed for Atari ST, Amiga, and MS-DOS in . It was the first of the short-lived "Laura Bow Mysteries" series created by Roberta Williams, which used many elements from the game "Mystery House" and is known for its lack of discernible point system. "The Colonel's Bequest" was created with SCI0, and employed 4-bit color (16 colors) and a typing interface. Its sequel "The Dagger of Amon Ra" was released in 1992.  - The Atari ST is a line of home computers from Atari Corporation and the successor to the Atari 8-bit family. The initial ST model, the 520ST, saw limited release in the spring of 1985 and was widely available in July. The Atari ST is the first personal computer to come with a bit-mapped color GUI, using a version of Digital Research's GEM released in February 1985. The 1040ST, released in 1986, is the first personal computer to ship with a megabyte of RAM in the base configuration and also the first with a cost-per-kilobyte of less than US$1.  - King's Quest is a graphic adventure game series created by the American software company Sierra Entertainment. It is widely considered a classic series from the golden era of adventure games. Following the success of its first installments, the series was primarily responsible for building the reputation of Sierra. Roberta Williams, co-founder and former co-owner of Sierra, designed all of the "King's Quest" games until the series' reboot in 2015.  - A CD-ROM is a pre-pressed optical compact disc which contains data. The name is an acronym which stands for "Compact Disc Read-Only Memory". Computers can read CD-ROMs, but cannot write to CD-ROMs which are not writable or erasable.  - Roberta Williams ' Laura Bow in : The Dagger of Amon Ra ( also known as Laura Bow II ) is a computer game published by Sierra On - Line in 1992 . The game is the second and final installment in the Laura Bow Mysteries line of adventure games , the first of which was The Colonel 's Bequest . Unlike the first game , it was not written or designed by Roberta Williams , she was a creative consultant on the project . It uses 8 - bit color and a point - and - click interface . The CD - ROM version included voice acting . The Dagger of Amon Ra was developed using Sierra 's Creative Interpreter ( SCI1.1 ) . Overall , this sequel owes little to the original game and is a much more traditional point - and - click game .  - The Amiga is a family of personal computers sold by Commodore in the 1980s and 1990s. Based on the Motorola 68000 family of microprocessors, the machine has a custom chipset with graphics and sound capabilities that were unprecedented for the price, and a pre-emptive multitasking operating system called AmigaOS. The Amiga provided a significant upgrade from earlier 8-bit home computers, including Commodore's own C64.  - Compact disc (CD) is a digital optical disc data storage format released in 1982 and co-developed by Philips and Sony. The format was originally developed to store and play only sound recordings but was later adapted for storage of data (CD-ROM). Several other formats were further derived from these, including write-once audio and data storage (CD-R), rewritable media (CD-RW), Video Compact Disc (VCD), Super Video Compact Disc (SVCD), Photo CD, PictureCD, CD-i, and Enhanced Music CD. Audio CD players have been commercially available since October 1982, when the first commercially available CD player was released in Japan.    Given the information above, choose from the list below the object entity that exhibits the relation 'developer' with the subject 'the dagger of amon ra'.  Choices: - atari  - digital research  - ibm  - king  - microsoft  - motorola  - philips  - ram  - sierra entertainment  - sony
sierra entertainment