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Monitor Display ports
Digital RGBI (MDA,CGA,EGA,NEC)
Pins layout
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Connector : female DB9
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MDA (Hercules) & CGA
| | Pin
| MDA
| CGA
| Description
| | 1
| GND
| GND
| Ground
| | 2
| GND
| GND
| Ground
| | 3
| NC
| R
| Red (CGA only)
| | 4
| NC
| G
| Green (CGA only)
| | 5
| NC
| B
| Blue (CGA only)
| | 6
| I
| I
| Intensity
| | 7
| V
| NC
| Video (MDA only)
| | 8
| H-Sync
| H-Sync
| Horizontal Sync (+)
| | 9
| V-Sync
| V-Sync
| Vertical Sync (-)
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Note : Many monitors have all signals (R,G,B & V) and can be used on both MDA and CGA.
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| EGA
| | Pin
| EGA
| Description
| | 1
| GND
| Ground
| | 2
| R*
| Ground
| | 3
| R
| Red
| | 4
| G
| Green
| | 5
| B
| Blue
| | 6
| G*
| Green
| | 7
| B*
| Video
| | 8
| H-Sync
| Horizontal Sync (+)
| | 9
| V-Sync
| Vertical Sync (-)
| | NEC
| | Pin
| EGA
| Description
| | 1
| I
| Intensity
| | 2
| R
| Red
| | 3
| G
| Green
| | 4
| B
| Blue
| | 5
| GND
| Ground
| | 6
| GND
| Ground
| | 7
| H-Sync
| Horizontal Sync (+)
| | 8
| V-Sync
| Vertical Sync (-) (+)
| | 9
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Analogic RGB (VGA,SVGA,VESA)
Pins layout
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Connector : female DB15c
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VGA, VESA DDC (Display Data Channel)
| | Pin
| VGA
| VESA DDC
| Description
| | 1
| R-out
| R-out
| Red out
| | 2
| G-out
| G-out
| Green out
| | 3
| B-out
| B-out
| Blue out
| | 4
| ID 2
| Reserved
| Monitor ID bit 2
| | 5
| GND
| GND
| Ground
| | 6
| R-return
| R-GND
| Red return/Ground
| | 7
| G-return
| G-GND
| Green return/Ground
| | 8
| B-return
| B-GND
| Blue return/Ground
| | 9
| Key (no pin)
| +5V
| Power +5V
| | 10
| Sync-return
| SGND
| Sync-return/Ground
| | 11
| ID 0
| ID 0
| Monitor ID bit 0
| | 12
| ID 1
| SDA
| Monitor ID bit 1/
DDC Serial Data Line
| | 13
| H-Sync
| H-Sync/CSYNC
| Horizontal Sync (/ Composite Sync)
| | 14
| V-Sync
| V-Sync
| Vertical Sync
| | 15
| Reserved
| SCL
| DDC Data Clock Line
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Connector : female DB9
| | VGA 9 pins
| | Pin
| VGA 9
| Description
| | 1
| R-out
| Red out
| | 2
| G-out
| Green out
| | 3
| B-out
| Blue out
| | 4
| H-Sync
| Horizontal Sync
| | 5
| V-Sync
| Vertical Sync
| | 6
| R-GND
| Red Ground
| | 7
| G-GND
| Green Ground
| | 8
| B-GND
| Blue Ground
| | 9
| SGND
| Sync Ground
| | Note : This connector have
been used in the beginning of VGA displays and is now replaced by the DB15c.
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