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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.
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) 320 × 200 in four colors from a 16 color hardware palette with a pixel aspect ratio of 1:1.2.
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.
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 ...
Front and rear views of the TVM MD-3 cathode-ray tube monitor (Enhanced Graphics Adapter era). Note the DE-9 connector, cryptic mode switch, contrast and brightness controls at front, and the V-Size and V-Hold knobs at rear, which allow the control of the scaling and signal to CRT refresh rate synchronization respectively.
160 cycles of the NTSC color clock occur during each line's output, so in 40 column mode each pixel occupies half a cycle and in 80 column mode each pixel uses a quarter of a cycle. Limiting the character display to the upper one or two scanlines, and taking advantage of the pixel arrangement in certain characters of the codepage 437 , it is ...
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.
In some systems, as Hercules and CGA graphic cards for the IBM PC, a bit value of 1 represents white pixels (light on) and a value of 0 the black ones (light off); others, like the Atari ST and Apple Macintosh with monochrome monitors, a bit value of 0 means a white pixel (no ink) and a value of 1 means a black pixel (dot of ink), which it ...