9-pin display
The application of 9-pin interface display technology is common in the early days of the computer system. It includes 3-pin, 4-pin, 6-pin, 7-pin, 9-pin, 25-pin signal interfaces, etc. The application is like the PC system before 286 and automation. Control system, the current computer system has been upgraded to the 15-pin VGA interface, 9-pin monitor is no longer in the common PC applications, but the numerical control or industrial industry because of the stability of the device or update is slow, some old devices often fail to update the video The use of a 9-pin monitor for the card is still very much a problem. However, the 9-pin monitor (or other irregular interface monitor) on the market is no longer common. Therefore, the signal of the 9-pin monitor or video module needs to be upgraded. The versatility of the equipment.
The following describes the upgrading method of the 9-pin monitor or other irregular signal interfaces: Through the GBS 8218 video signal conversion, it is easy to upgrade and replace the old 9-pin signal.
9-pin display common signal modes
MDA 9-pin display standard:
The MDA standard is the first standard for PC video display. It only supports character display function, no graphics function, no color display capability, and no gray scale. Therefore it is very limited in use.
The MDA display standard character display specification is 80 columns * 25 lines with a resolution of 720*350. The line frequency is 18.432khz, the field frequency is 50hz, and the signal interface uses a 9-pin D-shaped interface. The following is the definition of the MDA standard:
1 GND (ground)
2 GND (ground)
3 NC (empty)
4 NC (empty)
5 NC (empty)
6 INTENSITY, TTL level
7 VIDEO (video) TTL level
8 H-SYNC (line synchronization) TTL level
9 V-SYNC (Field Synchronous) TTL Level
CGA 9-pin display standard:
The CGA emerged as a replacement for MDA, which adds two more features than MDA, namely color display and graphic display. Its highest resolution is 640X200, but this method can only display a single color. When working in color graphics mode, the resolution is very low and can only reach 320X200. Its line frequency is 15.7khz and the field frequency is 60hz. It specifies two types of interfaces, one is a 9-pin D-shaped interface, and the pins have the same arrangement with the MDA. The other is to output the NTSC composite video signal, so the NTSC TV can be used as a computer monitor.
EGA 9-pin display standard:
EGA was a supplemental graphics adapter at the time. Compatible with CGA software. Its highest resolution is 640*350, line frequency is 21.8khz, and field frequency is 60hz. Can be set to monochrome display. Its signal interface is also used D-shaped 9-pin, its arrangement and MDA, CGA the same.
VGA 9-pin display standard:
The VGA9 pin standard contains 31k or more line frequency and 31k or less irregular line and field frequency signals. The common 9-pin definition is as follows:
1 RED (red)
2 GREEN (green)
3 BLUE (blue)
4 HSYNC (line synchronization)
5 VSYNC (field synchronization)
6 RGND (red ground)
7 GGND (green area)
8 BGND (blue ground)
9 SGND (synchronously)
GBS 8218 signal converter can convert various MDA, CGA, EGA, non-standard VGA signals (3-pin, 4-pin, 7-pin, 9-pin, 25-pin signal interfaces, monochrome, multicolor, black and white signals) to VGA standard Display signals, directly connected to the computer LCD, CRT monitors, projectors, etc., easy to upgrade your original display system, clear picture quality, stable performance, widely used in industrial displays, CNC machine tools, automation control and many other fields.
GBS 8218 source support:
Black and white signal monochrome signal (green, yellow, blue)
Multi-color signal (non-true color signal source)
RGB Sog (Green sync signal)
RGBHV (Separate Sync)
RGBS (Composite sync)
G (monochrome grayscale composite synchronization)
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The GBS 8218 video converter has been rigorously tested for the replacement and upgrading of old-style non-standard displays such as industrial computers, injection molding machines, CNC machine tools, and automatic control. We have accumulated rich experience and solutions in industrial video replacement and transformation and look forward to further communication with you. , to call out the effectiveness of old equipment, but also save you money and save valuable time.