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Yamaha V9958
The Yamaha V9958 is a Video Display Processor used in the MSX2+ and MSX turbo R series of home computers, as the successor to the Yamaha V9938 used in the MSX2. The main new features are three graphical YJK modes with up to 19268 colors and horizontal scrolling registers. The V9958 was not as widely adopted as the V9938. Specifications * Video RAM: 128 KB + 64 KB of expanded VRAM * Text modes: 80 x 24 and 32 x 24 * Resolution: 512 x 212 (4 or 16 colors out of 512) and 256 x 212 (16, 256, 12499 or 19268 colors) * Sprites: 32, 16 colors, max 8 per horizontal line * Hardware acceleration for copy, line, fill, etc. * Interlacing to double vertical resolution * Horizontal and vertical scroll registers Feature changes from the V9938 The following features were added to or removed from the Yamaha V9938 specifications: * Added horizontal scrolling registers * Added YJK graphics modes (similar to YUV): ** G7 + YJK + YAE: 256 x 212, 12499 colors + 16 color palette ** G7 + YJK: 256 x 21 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
V9958 01
The Yamaha V9958 is a Video Display Processor used in the MSX2+ and MSX turbo R series of home computers, as the successor to the Yamaha V9938 used in the MSX2. The main new features are three graphical YJK modes with up to 19268 colors and horizontal scrolling registers. The V9958 was not as widely adopted as the V9938. Specifications * Video RAM: 128 KB + 64 KB of expanded VRAM * Text modes: 80 x 24 and 32 x 24 * Resolution: 512 x 212 (4 or 16 colors out of 512) and 256 x 212 (16, 256, 12499 or 19268 colors) * Sprites: 32, 16 colors, max 8 per horizontal line * Hardware acceleration for copy, line, fill, etc. * Interlacing to double vertical resolution * Horizontal and vertical scroll registers Feature changes from the V9938 The following features were added to or removed from the Yamaha V9938 specifications: * Added horizontal scrolling registers * Added YJK graphics modes (similar to YUV): ** G7 + YJK + YAE: 256 x 212, 12499 colors + 16 color palette ** G7 + YJK: 256 x 21 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hardware Acceleration
Hardware acceleration is the use of computer hardware designed to perform specific functions more efficiently when compared to software running on a general-purpose central processing unit (CPU). Any transformation of data that can be calculated in software running on a generic CPU can also be calculated in custom-made hardware, or in some mix of both. To perform computing tasks more quickly (or better in some other way), generally one can invest time and money in improving the software, improving the hardware, or both. There are various approaches with advantages and disadvantages in terms of decreased latency, increased throughput and reduced energy consumption. Typical advantages of focusing on software may include more rapid development, lower non-recurring engineering costs, heightened portability, and ease of updating features or patching bugs, at the cost of overhead to compute general operations. Advantages of focusing on hardware may include speedup, reduced pow ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MSX BASIC
MSX BASIC is a dialect of the BASIC programming language. It is an extended version of Microsoft's MBASIC Version 4.5, adding support for graphic, music, and various peripherals attached to MSX microcomputers. Generally, MSX BASIC is designed to follow GW-BASIC, released the same year for IBM PCs and clones. During the creation of MSX BASIC, effort was made to make the system flexible and expandable. Distribution MSX BASIC came bundled in the ROM of all MSX computers. At system start-up MSX BASIC is invoked, causing its command prompt to be displayed, unless other software placed in ROM takes control (which is the typical case of game cartridges and disk interfaces, the latter causing the MSX-DOS prompt to be shown if there is a disk present which contains the DOS system files). When MSX BASIC is invoked, the ROM code for BIOS and the BASIC interpreter itself are visible on the lower 32K of the Z80 addressing space. The upper 32K are set to RAM, of which about 23K to 28K are av ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Composite Video
Composite video is an analog video signal format that carries standard-definition video (typically at 525 lines or 625 lines) as a single channel. Video information is encoded on one channel, unlike the higher-quality S-Video (two channels) and the even higher-quality component video (three or more channels). In all of these video formats, audio is carried on a separate connection. Composite video is also known by the initials CVBS for composite video baseband signal or color, video, blanking and sync, or is simply referred to as ''SD video'' for the standard-definition television signal it conveys. There are three dominant variants of composite video signals, corresponding to the analog color system used: NTSC, PAL, and SECAM. Usually composite video is carried by a yellow RCA connector, but other connections are used in professional settings. Signal components A composite video signal combines, on one wire, the video information required to recreate a color picture, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Computer Mouse
A computer mouse (plural mice, sometimes mouses) is a hand-held pointing device that detects two-dimensional motion relative to a surface. This motion is typically translated into the motion of a pointer on a display, which allows a smooth control of the graphical user interface of a computer. The first public demonstration of a mouse controlling a computer system was in 1968. Mice originally used two separate wheels to track movement across a surface: one in the X-dimension and one in the Y. Later, the standard design shifted to utilize a ball rolling on a surface to detect motion. Most modern mice use optical sensors that have no moving parts. Though originally all mice were connected to a computer by a cable, many modern mice are cordless, relying on short-range radio communication with the connected system. In addition to moving a cursor, computer mice have one or more buttons to allow operations such as the selection of a menu item on a display. Mice often also feature ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lightpen
A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's cathode-ray tube (CRT) display. It allows the user to point to displayed objects or draw on the screen in a similar way to a touchscreen but with greater positional accuracy. A light pen can work with any CRT-based display, but its ability to be used with LCDs was unclear (though Toshiba and Hitachi displayed a similar idea at the "Display 2006" show in Japan). A light pen detects changes in brightness of nearby screen pixels when scanned by cathode-ray tube electron beam and communicates the timing of this event to the computer. Since a CRT scans the entire screen one pixel at a time, the computer can keep track of the expected time of scanning various locations on screen by the beam and infer the pen's position from the latest time stamps. History The first light pen, at this time still called "light gun", was created around 1945–1955 as part of the Whirl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hardware Acceleration
Hardware acceleration is the use of computer hardware designed to perform specific functions more efficiently when compared to software running on a general-purpose central processing unit (CPU). Any transformation of data that can be calculated in software running on a generic CPU can also be calculated in custom-made hardware, or in some mix of both. To perform computing tasks more quickly (or better in some other way), generally one can invest time and money in improving the software, improving the hardware, or both. There are various approaches with advantages and disadvantages in terms of decreased latency, increased throughput and reduced energy consumption. Typical advantages of focusing on software may include more rapid development, lower non-recurring engineering costs, heightened portability, and ease of updating features or patching bugs, at the cost of overhead to compute general operations. Advantages of focusing on hardware may include speedup, reduced pow ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Interlaced Video
Interlaced video (also known as interlaced scan) is a technique for doubling the perceived frame rate of a video display without consuming extra bandwidth. The interlaced signal contains two fields of a video frame captured consecutively. This enhances motion perception to the viewer, and reduces flicker by taking advantage of the phi phenomenon. This effectively doubles the time resolution (also called ''temporal resolution'') as compared to non-interlaced footage (for frame rates equal to field rates). Interlaced signals require a display that is natively capable of showing the individual fields in a sequential order. CRT displays and ALiS plasma displays are made for displaying interlaced signals. Interlaced scan refers to one of two common methods for "painting" a video image on an electronic display screen (the other being progressive scan) by scanning or displaying each line or row of pixels. This technique uses two fields to create a frame. One field contains all od ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sprite (computer Graphics)
Sprite commonly refers to: * Sprite (drink), a lemon-lime beverage produced by the Coca-Cola Company * Sprite (computer graphics), a smaller bitmap composited onto another by hardware or software * Sprite (folklore), a type of legendary creature including elves, fairies, and pixies Sprite may also refer to: Comics *Sprite (Eternal), a fictional member of the race of Eternals in the Marvel Universe * ''Sprite'' (manga), a 2009 Japanese manga series *Sprite, alias of the Marvel Comics character Kitty Pryde *Sprite comic, a webcomic that consists primarily of computer sprites from video games Computing and technology * Sprite (operating system), an operating system developed at the University of California, Berkeley * SPRITE (spacecraft), a proposed Saturn atmospheric probe mission * SPRITE infrared detector, a specialist detector device using a process known as signal processing in the element * De Havilland Sprite, a British rocket engine Vehicles * Sprite (motorcycle), a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
V9958 02
The Yamaha V9958 is a Video Display Processor used in the MSX2+ and MSX turbo R series of home computers, as the successor to the Yamaha V9938 used in the MSX2. The main new features are three graphical YJK modes with up to 19268 colors and horizontal scrolling registers. The V9958 was not as widely adopted as the V9938. Specifications * Video RAM: 128 KB + 64 KB of expanded VRAM * Text modes: 80 x 24 and 32 x 24 * Resolution: 512 x 212 (4 or 16 colors out of 512) and 256 x 212 (16, 256, 12499 or 19268 colors) * Sprites: 32, 16 colors, max 8 per horizontal line * Hardware acceleration for copy, line, fill, etc. * Interlacing to double vertical resolution * Horizontal and vertical scroll registers Feature changes from the V9938 The following features were added to or removed from the Yamaha V9938 specifications: * Added horizontal scrolling registers * Added YJK graphics modes (similar to YUV): ** G7 + YJK + YAE: 256 x 212, 12499 colors + 16 color palette ** G7 + YJK: 256 x 21 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Display Resolution
The display resolution or display modes of a digital television, computer monitor or display device is the number of distinct pixels in each dimension that can be displayed. It can be an ambiguous term especially as the displayed resolution is controlled by different factors in cathode ray tube (CRT) displays, flat-panel displays (including liquid-crystal displays) and projection displays using fixed picture-element (pixel) arrays. It is usually quoted as ', with the units in pixels: for example, ' means the width is 1024 pixels and the height is 768 pixels. This example would normally be spoken as "ten twenty-four by seven sixty-eight" or "ten twenty-four by seven six eight". One use of the term ''display resolution'' applies to fixed-pixel-array displays such as plasma display panels (PDP), liquid-crystal displays (LCD), Digital Light Processing (DLP) projectors, OLED displays, and similar technologies, and is simply the physical number of columns and rows of pixels creating ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Video RAM
Dual-ported video RAM, or VRAM, is a dual-ported variant of dynamic RAM (DRAM), which was once commonly used to store the framebuffer in graphics adapters. Note that most computers and game consoles do not use this form of memory, and dual-ported VRAM should not be confused with other forms of video memory. History It was invented by F. Dill, D. Ling and R. Matick at IBM Research in 1980, with a patent issued in 1985 (US Patent 4,541,075). The first commercial use of VRAM was in a high-resolution graphics adapter introduced in 1986 by IBM for its RT PC system, which set a new standard for graphics displays. Prior to the development of VRAM, dual-ported memory was quite expensive, limiting higher resolution bitmapped graphics to high-end workstations. VRAM improved the overall framebuffer throughput, allowing low cost, high-resolution, high-speed, color graphics. Modern GUI-based operating systems benefitted from this and thus it provided a key ingredient for proliferation o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
