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From: dillon@CORY.BERKELEY.EDU (Matt Dillon)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Analog vs. Digital Displays
Message-ID: <8704130344.AA19799@cory.Berkeley.EDU>
Date: Sun, 12-Apr-87 22:44:29 EST
Article-I.D.: cory.8704130344.AA19799
Posted: Sun Apr 12 22:44:29 1987
Date-Received: Sat, 18-Apr-87 17:42:11 EST
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>The way I understand it, digital signals on PCs are made up of four signals,
>red, green, blue, and an intensity signal giving 16 colours. How does analog
>work? What are the advantages of analog over digital? Does it allow for higher
>frequency of scan rate and thus more colours and higher resolution?

	With Analog, you usually have R,G, and B but no intensity signal. 
Each R, G, B is an analog voltage rather than a digital voltage.  So, to get
a pallette of 256K, each R, G, and B would have 64 levels.

	The advantages over digital are simply that you get a much broader
color range (assumming your monitor has analog inputs).  Analog does not
mean higher frequency as far as the monitor is concerned.  However, you
would need a larger memory bandwidth on the processor bus assumming, say,
8 bit planes generating 256 colors out of a pallette of 256K.

	Analog looks *much* better than digital.  Remember, before analog
came along people were trying to get around the 'digital' monitors by
modulating the digital outputs.

			-Matt