Re: Second Sight Question

[aiiadict@gmail.com]

http://www.zipworld.com.au/~kashum/a2lib/


there are libraries for Merlin for the Second
Sight card on this page.

This is the author of Marinetti, Richard B's
page.



Rich



The Wizard of Oz wrote:
> 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