The Enhanced Video Connector Interface bus [EVC] uses a 35-pin
connector defined by the Video Electronic Standards Association [VESA].
The EVC bus combines both analog and digital signaling.
The EVC interface
is designed to carry VGA/RGB, FireWire, audio, and USB signals.
The EVC connector is essentially the same as the DVI connector, except it carries different signals.
The EVC bus was released in 1995 and defined by Video Electronic Standards Association (VESA).
The pin out was changed between version 1 and version
2 of the standard to align it with the P & D pinout.
The changes moved signals; Change Power +, and Change Power Return.
A listing of companies that manufacture connectors may be found on the
Connector Manufacturers page.
The table below provides the EVC pinout and signal names for the EVC connector.
The graphic allows the location of the different pins on the connector.
| Pin # | Signal name | Pin # | Signal name | Pin # | Signal name |
|---|---|---|---|---|---|
| 1 | Audio output, Right | 11 | Changing Power + | 21 | Audio input, Left |
| 2 | Audio output, Left | 12 | Changing Power- | 22 | Audio input, Right |
| 3 | Audio output return | 13 | Video input, Y or composite in | 23 | Audio input return |
| 4 | Sync return | 14 | Video input, return | 24 | Stereo sync (TTL) |
| 5 | Horizontal sync (TTL) | 15 | Video input, C in | 25 | DDC return |
| 6 | Vertical sync (TTL) | 16 | USB data + | 26 | DDC data (SDA) |
| 7 | Reserved | 17 | USB data - | 27 | DDC, clock (SCL) |
| 8 | Reserved | 18 | USB/1394 common mode shield | 28 | +5 VDC |
| 9 | 1394 pair A, data - | 19 | 1394 Vg | 29 | 1394 pair B, clock + |
| 10 | 1394 pair A, data + | 20 | 1394 Vp | 30 | 1394 pair B, clock - |
| C1 | Red Video | C2 | Green Video | C3 | Pixel Clock |
| C4 | Blue Video | C5 | Video/PixelGround | - | - |
Not sure if the EVC interface ever caught on. I assume it was an up-grade to the VGA interface.
Some sites state it is the same as the P&D interface, although the P&D [1997] followed the EVC interface [1995].
Additional Video Interfaces
EGA [Enhanced Graphics Adapter], an obsolete interface from 1984.
VGA [Video Graphics Array]: an out-dated interface from 1987, later upgraded to SVGA.
SVGA [Super VGA] offers more colors and
resolutions, but really does not exist as a single standard. The primary
standard refers to the BIOS, and how the computer talks to the monitor.
VESA Display Data Channel [DDC] is a VESA standard that defines how to
read certain pins in a standard SVGA monitor to query the monitor's
capabilities.
XGA [Extended Graphics Array]:
an obsolete interface from 1990.
FPDI [Flat Panel Display
Interface] describes the electrical, logical, and connector interface
between flat panel displays and display controllers in an integrated
environment.
VMChannel [VESA Media
Channel] describes a hardware interface for desktop multimedia
systems. The VMChannel is a multiple master, multiple drop, clock
synchronous interface designed for concurrent pixel data streams.
VMChannel enables the real time flow of uncompressed multimedia pixels in
a bidirectional fashion between multiple video adapters.
Use the Buses icon at the bottom of the page to reach the top level index for all bus types.
The Equipment icon at the bottom of the page to reach manufacturers of PC Monitors.
Back to the main PC Video Monitor Bus page, or to
the main PC Interface Bus page.
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