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A raster interrupt (also called a horizontal blank interrupt) is an interrupt signal in a legacy computer system which is used for display timing. It is usually, though not always, generated by a system's graphics chip as the scan lines of a frame are being readied to send to the monitor for display.
Atari 8 bit Moiré pattern in 320 horizontal pixel graphics mode. The colors are artifacts of displaying hi-res pixels which are half the size of the NTSC color clock. Graphics 8 mode on early Atari 8-bit computers with the Color Television Interface Adaptor (CTIA) chip displayed black or white images at a resolution of 320×192.
Bit 4: Blank-to-black setup (pedestal) expected Bit 3: Separate sync supported Bit 2: Composite sync (on HSync) supported Bit 1: Sync on green supported Bit 0: VSync pulse must be serrated when composite or sync-on-green is used. 21: Horizontal screen size, in centimetres (range 1–255).
A scan line (also scanline) is one line, or row, in a raster scanning pattern, such as a line of video on a cathode-ray tube (CRT) display of a television set or computer monitor. [1] On CRT screens the horizontal scan lines are visually discernible, even when viewed from a distance, as alternating colored lines and black lines, especially when ...
The highest display resolution of any mode was 640 × 200, and the highest color depth supported was 4-bit (16 colors). The CGA card could be connected either to a direct-drive CRT monitor using a 4-bit digital RGBI interface, such as the IBM 5153 color display, or to an NTSC-compatible television or composite video monitor via an RCA connector ...
This part of the line display process is the Horizontal Blank. [1] [2] In detail, the Horizontal blanking interval consists of: front porch – blank while still moving right, past the end of the scanline, sync pulse – blank while rapidly moving left; in terms of amplitude, "blacker than black".
The 4-bit RGBI palette is similar to the 3-bit RGB palette but adds one bit for intensity. This allows each of the colors of the 3-bit palette to have a dark and bright variant, potentially giving a total of 2 3 ×2 = 16 colors. However, some implementations had only 15 effective colors due to the "dark" and "bright" variations of black being ...
The exact difference between horizontal and diagonal dot pitch varies with the design of the monitor (see pixel geometry and widescreen), but a typical entry-level 0.28 mm (diagonal) monitor has a horizontal pitch of 0.24 or 0.25 mm, and a good quality 0.26 mm (diagonal) unit has a horizontal pitch of 0.22 mm.