TAILIEUCHUNG - Handbook Phần Cứng PU part 37

Tham khảo tài liệu 'handbook phần cứng pu part 37', công nghệ thông tin, phần cứng phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Hardware manufacturers One of the first manufacturers of sound cards for the IBM PC was AdLib who produced a card based on the Yamaha YM3812 sound chip aka the OPL2. The AdLib had two modes A 9-voice mode where each voice could be fully programmed and a lesser-used percussion mode that used 3 regular voices to produce 5 independent percussion-only voices for a total of 11. The percussion mode was considered inflexible by most developers so it was used mostly by AdLib s own composition software. Creative Labs also marketed a sound card at the same time called the Creative Music System. Although the C MS had twelve voices to AdLib s nine and was a stereo card while the AdLib was mono the basic technology behind it was based on the Philips SAA 1099 which was essentially a square-wave generator. Sounding not unlike twelve simultaneous PC speakers it never caught on the way the AdLib did even after Creative marketed it a year later through Radio Shack as the Game Blaster. The Game Blaster retailed for under 100 and included the hit game title Silpheed. Probably the most significant historical change in the history of sound cards came when Creative Labs produced the Sound Blaster card. The Sound Blaster cloned the AdLib and also added a sound coprocessor to record and play back digital audio presumably an Intel microcontroller which Creative incorrectly called a DSP to suggest it was a digital signal processor a game port for adding a joystick and the ability to interface to MIDI equipment using the game port and a special cable . With more features at nearly the same price point and compatibility with existing AdLib titles most first-time buyers chose the Sound Blaster. The Sound Blaster eventually outsold the AdLib and set the stage for dominating the market. The Sound Blaster line of cards in tandem with the first cheap CD-ROM drives and evolving video technology ushered in a new era of multimedia computer applications that could play back CD audio add recorded .

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