The EDID is often stored in the monitor in the firmware chip called serial EEPROM (electrically erasable PROM) and is accessible via the I☬-bus at address 0x50. The channel for transmitting the EDID from the display to the graphics card is usually the I☬-bus, defined in DDC2B (DDC1 used a different serial format which never gained popularity). Some VGA connectors in personal computers provided a basic form of identification by connecting one, two or three pins to ground, but this coding was not standardized. īefore Display Data Channel (DDC) and EDID were defined, there was no standard way for a graphics card to know what kind of display device it was connected to. Version 2.0 defined a new 256-byte structure but it has been deprecated and replaced by E-EDID which supports multiple extension blocks. JSTOR ( February 2013) ( Learn how and when to remove this template message)ĮDID structure (base block) versions range from v1.0 to v1.4 all these define upwards-compatible 128- byte structures. ![]() Please improve this section by adding secondary or tertiary sources.įind sources: "Extended Display Identification Data" – news This section relies too much on references to primary sources.
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