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Mode 13h is the standard 256-color mode on VGA graphics hardware introduced in 1987 with the IBM PS/2. It has a resolution of 320 × 200 pixels . [ 1 ] It was used in computer games and art / animation software of the late 1980s and early to mid-1990s.
640 × 480 monochrome (mode 11h) 320 × 200 in 256 colors (from a palette of 262,144; mode 13h) CGA compatible modes: 40 × 25 text mode with 8×8 pixel font (effective resolution of 320 × 200; mode 0/1h) 80 × 25 text mode with 8×8 pixel font (effective resolution of 640 × 200; mode 2/3h)
The term "Mode X" was coined by Abrash. Mode X is a variant of the 320 × 200 Mode 13h with the resolution increased to 320 × 240, giving square pixels instead of the slightly elongated pixels of Mode 13h. It is enabled by entering Mode 13h via an BIOS system call, then changing the values of several VGA registers. Additionally, Abrash enabled ...
Such services include setting the video mode, character and string output, and graphics primitives (reading and writing pixels in graphics mode). To use this call, load AH with the number of the desired subfunction, load other required parameters in other registers, and make the call.
Other common display modes also defined as VGA include 320×200 at 256 colours (8 bpp) (standard VGA resolution for DOS games that stems from halving the pixel rate of 640×400, but doubling color depth) and a text mode with 720×400 pixels; these modes run at 70 Hz and use non-square pixels, so 4:3 aspect correction is required for correct ...
320 × 200 at 70 Hz was the most common mode for early 1990s PC games, with pixel-doubling and line-doubling performed in hardware to present a 640 × 400 at 70 Hz signal to the monitor. The Windows 95/98/Me LOGO.SYS boot-up image was 320 × 400 resolution, displayed with pixel-doubling to present a 640 × 400 at 70 Hz signal to the monitor.
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The resolution of 960H depends on whether the equipment is PAL or NTSC based: 960H represents 960 x 576 (PAL) or 960 x 480 (NTSC) pixels. [29] 960H represents an increase in pixels of some 30% over standard D1 resolution, which is 720 x 576 pixels (PAL), or 720 x 480 pixels (NTSC). The increased resolution over D1 comes as a result of a longer ...