Re: Second Sight Question

[The Wizard of Oz <wizard@emeraldcity.gov>]

On Tue, 11 Jan 2005 18:09:10 +0000, Michael J. Mahon wrote:

> Bryan Parkoff asked:
> 
>>    Low Res, High Res, Double High Res use main bank and aux bank and Super 
>>Res uses $E0 bank and $E1 bank.  My question is which memory location Second 
>>Sight's modes such as 640x400x256, 1024x768x256, and beyond are stored. 
>>Someone told me that all pixel information are stored in Second Sight card's 
>>RAM, but they do not store in the motherboard's RAM.
>>    If pixel information is stored in Second Sight card's RAM, how can 65816 
>>instructions access by modifying pixel data in the memory location that they 
>>should be in motherboard's RAM.  Is there a special softswitch to transfer 
>>pixel data from motherboard's RAM to Second Sight card's RAM?
>>    I am not sure if the information is wrong.  Please let me know when you 
>>find the information where pixel information is stored.  Thanks...
> 
> The Second Sight card has a processor on board that eavesdrops
> graphics updates to Apple graphics pages and "translates" them
> into "equivalent" updates in its own memory, which is the video
> RAM on the Second Sight card.
> 
> This is much more like the video card model of the PC.
> 
> Of course, it would also be possible to provide modes on the
> card in which the Apple processor could indirectly access the
> video RAM on the card, but those modes would, of course, not
> be compatible with Apple II graphics.
> 
> -michael
> 
> New Applesoft BASIC interface for NadaNet networking!
> Home page:  http://members.aol.com/MJMahon/

	Odd thought... Does anybody have a routine which would allow a programmer
like myself to send a pixel of a given colour to the card? Likewise would
someone have a routine to set up some predefined graphics modes? All I've
seen are some neat demos and specs but no actual code samples.

				Later
				Mike