Forudindstillede timertilstande

Specifikationer

Hvis signalet, der overføres fra computeren, er det samme som følgende forudindstillede timingtilstande, justeres skærmbilledet automatisk. Men hvis signalet er anderledes, bliver skærmbilledet muligvis sort, mens strøm-LED-indikatoren er tændt. Se i vejledningen til vid- eokortet og juster skærmen således.

Skærmtilstand	Horisontal	Vertical Fre-	Pixelclock	Synkroniser-
	frekvens	quency (Ver-	(MHz)	ingspolaritet
	(kHz)	tikal frekv-		(H/V)
		ens) (Hz)
IBM, 640 x 350	31,469	70,086	25,175	+/-
IBM, 640 x 480	31,469	59,940	25,175	-/-
IBM, 720 x 400	31,469	70,087	28,322	-/+
MAC, 640 x 480	35,000	66,667	30,240	-/-
MAC, 832 x 624	49,726	74,551	57,284	-/-
MAC, 1152 x 870	68,681	75,062	100,000	-/-
VESA, 640 x 480	37,861	72,809	31,500	-/-
VESA, 640 x 480	37,500	75,000	31,500	-/-
VESA, 800 x 600	35,156	56,250	36,000	+/+
VESA, 800 x 600	37,879	60,317	40,000	+/+
VESA, 800 x 600	48,077	72,188	50,000	+/+
VESA, 800 x 600	46,875	75,000	49,500	+/+
VESA, 848 x 480	31,020	60,000	33,750	+/+
VESA, 1024 x 768	48,363	60,004	65,000	-/-
VESA, 1024 x 768	56,476	70,069	75,000	-/-
VESA, 1024 x 768	60,023	75,029	78,750	+/+
VESA, 1152 x 864	67,500	75,000	108,000	+/+
VESA, 1280 x 768	47,776	59,870	79,500	-/+
VESA, 1280 x 960	60,000	60,000	108,000	+/+
VESA, 1280 x 1024	63,981	60,020	108,000	+/+
VESA, 1280 x 1024	79,976	75,025	135,000	+/+
VESA, 1360 x 768	47,712	60,015	85,500	+/+
VESA, 1366 x 768	47,712	59,790	85,500	+/+
VESA,1920 x 1080	66,587	59,934	138,500	+/-
VESA,1920 x 1080	67,500	60,000	148,500	+/+

Horisontal frekvens

Tiden for scanning af én linje, der forbinder den højre kant med den venstre kant af skærmen (vandret) kaldes for den horisontale cyklus, og den inverse værdi af den horisontale cyklus kaldes for den hori- sontale frekvens. Enhed: kHz

Vertikal frekvens

Som en fluorescerende lampe skal skærmen gent- age det samme billede mange gange i sekundet for at præsentere et billede for brugeren. Denne genta-

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