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Each screen character is represented by two bytes aligned as a 16-bit word accessible by the CPU in a single operation. The lower (or character) byte is the actual code point for the current character set, and the higher (or attribute) byte is a bit field used to select various video attributes such as color, blinking, character set, and so forth. [6]
Function code Parameters Return 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 ...
BIOS interrupt calls perform hardware control or I/O functions requested by a program, return system information to the program, or do both. A key element of the purpose of BIOS calls is abstraction - the BIOS calls perform generally defined functions, and the specific details of how those functions are executed on the particular hardware of the system are encapsulated in the BIOS and hidden ...
A BIOS Color Attribute is an 8 bit value where the low 4 bits represent the character color and the high 4 bits represent the background color.The name comes from the fact that these colors are used in BIOS interrupts, specifically INT 10h, the video interrupt.
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.
Ever since, EGA/VGA and all enhanced VGA compatible cards have included a Video BIOS. When the computer is started, some graphics cards (usually certain Nvidia cards) display their vendor, model, Video BIOS version and amount of video memory .
The second is the full-screen mode. In Windows XP and earlier, the full-screen console uses a hardware text mode and uploads a raster font to the video adapter. This is analogous to a text system console. This early full-screen mode only supports VGA-compatible text modes, giving it a maximum character resolution of 80 columns by 28 rows. [2]
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