EDID: Difference between revisions
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'''E'''xtended '''D'''isplay '''ID'''entification is data about the monitor, which the monitor provides to the video card. EDID is ''the'' programmatical way to check if a video mode is supported. However, this procedure is rather complex. (See [[Getting VBE Mode Info|VBE]] |
'''E'''xtended '''D'''isplay '''ID'''entification is data about the monitor, which the monitor provides to the video card. EDID is ''the'' programmatical way to check if a video mode is supported. However, this procedure is rather complex. (See [[Getting VBE Mode Info|VBE]].) |
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== Reading EDID == |
== Reading EDID == |
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The first step |
The first step is, naturally, to actually get the data. This is done through the BIOS - int 0x10, ax=4F15h, bl=01h. |
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<source lang="asm"> |
<source lang="asm"> |
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mov ax, 0x4f15 |
mov ax, 0x4f15 |
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;ES:DI contains the EDID |
;ES:DI contains the EDID |
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</source> |
</source> |
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Note that this code will only run in [[Real Mode]] or |
Note that this code will only run in [[Real Mode]] or [[Virtual 8086 Mode]]. |
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== EDID Data == |
== EDID Data == |
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Revision as of 06:29, 1 July 2015
Extended Display IDentification is data about the monitor, which the monitor provides to the video card. EDID is the programmatical way to check if a video mode is supported. However, this procedure is rather complex. (See VBE.)
Reading EDID
The first step is, naturally, to actually get the data. This is done through the BIOS - int 0x10, ax=4F15h, bl=01h.
mov ax, 0x4f15
mov bl, 0x01
mov cx, 0
mov dx, 0
int 0x10
;AL = 0x4F if function supported
;AH = status (0 is success, 1 is fail)
;ES:DI contains the EDID
Note that this code will only run in Real Mode or Virtual 8086 Mode.
EDID Data
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