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VGA text mode was introduced in 1987 by IBM as part of the VGA standard for its IBM PS/2 computers. [1] Its use on IBM PC compatibles was widespread through the 1990s and persists today for some applications on modern computers. [ 2 ]
VGA section on the motherboard in IBM PS/55. The color palette random access memory (RAM) and its corresponding digital-to-analog converter (DAC) were integrated into one chip (the RAMDAC) and the cathode-ray tube controller was integrated into a main VGA chip, which eliminated several other chips in previous graphics adapters, so VGA only additionally required external video RAM and timing ...
Mode X is a 320 × 240 256-color graphics display mode of the VGA graphics hardware for IBM PC compatibles.It was first publicized by Michael Abrash in his July 1991 column in Dr. Dobb's Journal and then in chapters 47-49 of Abrash's Graphics Programming Black Book. [1]
Super Video Graphics Array, abbreviated to Super VGA or SVGA, [1] [75] [84] also known as Ultra Video Graphics Array early on, [95] abbreviated to Ultra VGA or UVGA, is a broad term that covers a wide range of computer display standards. [96] Originally, it was an extension to the VGA standard first released by IBM in 1987.
Mode 13h is something of a curiosity, because the VGA is a planar device from a hardware perspective, and not suited to chunky graphics operation. The VGA has 256 KiB of video memory consisting of 4 banks of 64 KiB, known as planes (or 'maps' in IBM's documentation).
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.
Set video mode AH=00h AL = video mode. AL = video mode (For Old IBM Only) AL = video mode flag / CRT controller mode byte Set text-mode cursor shape AH=01h CH = Scan Row Start, CL = Scan Row End Normally a character cell has 8 scan lines, 0–7. So, CX=0607h is a normal underline cursor, CX=0007h is a full-block cursor.
The Linux kernel allows the user to select the VESA mode at boot time by passing a code in memory to the kernel. The LILO boot loader passes this code based on a "vga" parameter in its configuration file. It takes the form 'vga=XXX', where XXX is the decimal value, or 'vga=0xHHH', where HHH is the hexadecimal value.