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Re: Jon Relay's Apple II Info Archives: Graphics Modes (repost)
Thanks for the info! Now if I only knew how these modes are activated...
In article <20000212233111.01373.00000719@ng-ft1.aol.com>,
supertimer@aol.com (Supertimer) wrote:
> jonINTERNETrelayCHAT@napaVALLEYnet.CLARInet (Jon Bettencourt) wrote:
>
> >supertimer@aol.com (Supertimer) wrote:
> >
> >> What about IIGS SuperHires modes?
> >
> >Find the info and point me to it so I can add it.
>
> The following are IIGS Super High Resolution modes:
>
> The Video Graphics Chip (VGC) is a custom video chip
> that provides all of the GS' graphics modes. All modes
> use a 12-bit palette for 4096 colors.
> --320x200 with 16 colors
> --320x200 with 256 colors: in this mode, the VGC
> is taking advantage of the fact that it has memory
> for 16 separate palettes. Each scan line can be
> assigned any one of these 16 palettes for a total
> of 256 possible colors. This mode requires no CPU
> assistance and is often used in games.
> --320x200 with 3200 colors: in this mode, the CPU
> is used to swap palettes into and out of video
> memory such that a separate 16 color palette can
> be used on each of the 200 scan lines for 3200
> possible colors. This mode is often used for
> viewing graphics.
> --640x200 with 4 pure colors: this mode is bland
> and is not often used.
> --640x200 with 16 dithered colors: in this mode, the
> pixels in the graphic screen are grouped into
> even and odd columns. The even columns can have a
> palette of 4 pure colors out of a of 4096 possible.
> The odd columns can have a second palette of 4
> pure colors. The GS dithers the adjacent colors
> for 4x4=16 dithered colors. This mode is widely
> used in productivity programs and also in Apple's
> Finder for the GS.
> --Fill mode: for faster rendering of graphics, the
> fill mode is a hardware mode in which an outline
> of a graphic can be drawn and the outline filled
> by a solid color without needing to draw in all the
> pixels.
> --Combinations and variations: the Apple IIGS has
> scan line interrupts. Part of the screen can
> be in 640x200 mode and part of it can be in 320x200
> resolution. Such split modes are sometimes used
> in paint programs, where the menu bar is in 640x200
> while the graphic is in 320x200.
>
> >> Second Sight modes? (should be considered otherwise you should
> >> also not consider 80 columns and DHR on the IIe since the IIe also
> >> required a card to get those)
> >
> >Same thing as the above. Find the info and I'll add it.
>
> The Second Sight is an SVGA card with 1MB of memory
> for the IIGS. It provides PC type SVGA modes. This
> means 640x480 at 24-bit color up to 1024x768 at 256
> colors. 800x600 at intermediate color depth is also
> possible. Basically the same modes as a PC SVGA
> card with 1MB of video memory. The Second Sight was
> one of the last major peripherals I got for my IIGS and
> as you can imagine, viewing JPEG, PICT, and GIF pics
> that originated on the PC is a snap with the card. You
> can actually plug in an SVGA monitor and use it for
> best results or it works on the standard Apple IIGS
> monitor but limited to 640x400. It can also use Mac
> monitors with an adapter.
--
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jonrelay@napanet.net dimension18.cjb.net
An Apple II fanatic since 1998! S0.5 LIS+++! Suzy+++! M1987
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