vga显示模式

VGA：视频图形阵列 (VGA: Video Graphics Array)

VGA is an abbreviation of "Video Graphics Array".

VGA是“视频图形阵列”的缩写 。

It is a three-row 15-pin DE-15 connector display hardware developed by IBM in 1987. It was first launched with the IBM PS/2 line of computers. It makes available a resolution of 640x480 pixels and a refresh rate of 60 Hz.

它是由IBM在1987年开发的三排15针DE-15连接器显示硬件。它首先与IBM PS / 2系列计算机一起推出。 它提供了640x480像素的分辨率和60 Hz的刷新率。

VGA has alluded as an array at the place of an adopter because it was put into operation from the beginning as a single chip (ASIC). It uses analog signals as opposed to digital signals.

VGA被称为采用阵列，因为它是从一开始就作为单芯片(ASIC)投入使用的。 它使用模拟信号而不是数字信号。

Image source: https://www.indiamart.com/proddetail/projecter-vga-cable-20078614862.html

图片来源：https://www.indiamart.com/proddetail/projecter-vga-cable-20078614862.html

VGA的技术规格 (Technical Specifications of VGA)

Following are the technical specifications provided in the original VGA, which are:

以下是原始VGA中提供的技术规格：

• 256 kB Video RAM

  256 kB视频RAM

• 16-color and 256-color paletted display modes.

  16色和256色调色板显示模式。

• 262,144-color global palette (6 bits, and therefore 64 possible levels, for each of the red, green, and blue channels via the RAMDAC)

  262,144色全局调色板(通过RAMDAC的每个红色，绿色和蓝色通道为6位，因此有64种可能的色阶)

• Selectable 25.175 MHz or 28.322 MHz master pixel clock

  可选25.175 MHz或28.322 MHz主像素时钟

• Usual line rate fixed at 31.469 kHz

  通常的线速固定为31.469 kHz

• Maximum of 800 horizontal pixels

  最多800个水平像素

• Maximum of 600 lines

  最多600条线

• Refresh rates at up to 70 Hz

  刷新率高达70 Hz

• Vertical blank interrupt

  垂直空白中断

• Planar mode: up to 16 colors (4-bit planes)

  平面模式：最多16种颜色(4位平面)

• Packed-pixel mode: 256 colors (Mode 13h)

  填充像素模式：256色(模式13h)

• Hardware smooth scrolling support

  硬件平滑滚动支持

• No hardware sprites,

  没有硬件精灵，

• No Blitter, but supports very fast data transfers via "VGA latch" registers.

  无抖动，但通过“ VGA锁存器”寄存器支持非常快速的数据传输。

• Barrel shifter

  桶式移位器

• Split screen support

  分屏支持

• 0.7 V peak-to-peak

  峰峰值为0.7 V

• 75 ohm double-terminated impedance (18.7 mA, 13 mW)

  75欧姆双端接阻抗(18.7 mA，13 mW)

VGA形状和大小 (VGA Shape and Size)

• A VGA connector is shaped like a trapezoid and it has 15 pins.

  VGA连接器的形状像梯形，有15个针脚。

• If a user has an old designed monitor according to the older standards, then it may not be able to operate with Video Graphics Array standards.

  如果用户具有根据旧标准设计的旧显示器，则它可能无法使用视频图形阵列标准进行操作。

VGA相容性 (VGA Compatibility)

• The older VGAs make available a resolution of 640x480 pixels.

  较旧的VGA提供640x480像素的分辨率。

• After that older version, many modifications have been launched.

  在该旧版本之后，已启动了许多修改。

• The highly general version of VGA is Super VGA (SVGA). It enables resolutions better than 640x480, such as 800x600 or 1024x768.

  VGA的高度通用版本是Super VGA(SVGA)。 它可以提供比640x480更好的分辨率，例如800x600或1024x768。

VGA设计 (VGA Design)

• VGA connectors and cables transmit analog component RGBHV which are red, green, blue, horizontal sync, vertical sync video signals, and VESA Display Data Channel (VESA DDC) data.

  VGA连接器和电缆传输模拟分量RGBHV，它们是红色，绿色，蓝色，水平同步，垂直同步视频信号和VESA显示数据通道(VESA DDC)数据。

• The IBM 8513 monitor defined pin 5 as "Self Test", which put on view a white screen when the cable is disjointed.

  IBM 8513监视器将插针5定义为“自检”，当电缆断开连接时，白屏显示。

• The IBM PS/55 Display Adapter defined pin 9 as "+12V". It switches on the exact monitor when the system component is powered on.

  IBM PS / 55显示适配器将引脚9定义为“ + 12V”。 当系统组件打开电源时，它将打开确切的监视器。

翻译自: https://www.includehelp.com/dictionary/vga-full-form.aspx

vga显示模式