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- From: hmlaw@cucs18.cs.cuhk.hk (Law Hon Man)
- Subject: Re: 24-bit Color
- Message-ID: <1992Nov11.071059.22026@cucs5.cs.cuhk.hk>
- Sender: news@cucs5.cs.cuhk.hk
- Organization: Faculty of Engineering, The Chinese U. of Hong Kong
- References: <1dl27qINNo03@usenet.INS.CWRU.Edu>
- Date: Wed, 11 Nov 1992 07:10:59 GMT
- Lines: 18
-
- kxj6@po.CWRU.Edu (Kijin Jung) writes:
-
- >Is the video chip itself a constraint? That is, a certain chip will only
- >allow X number of colors? With a non-accelerated card such as mine, there
- >will of course be a detrimental effect on speed performance if it was
- >allowed to go up to 16 million colors, but it would be nice to have the
- >option.
-
- I think it is the constraint of the video chip first. As you know, VGA
- video card memory is organized in windows (64KB per window). So if a
- video card have 1 MB video memory, the video chip itself must have a
- 16bits page register at least. So, if the width of the page register is
- 16bits, then the maximum video memory that can be manipulated is 1024KB.
- For the video mode 1024x768x24bits, the page register itself must have
- 48bits (assume that the page is organized in 64Kb).
-
- Law Hon Man
- Chinese University of Hong Kong
-