Resolutions available on the Atari Falcon030

 



Resolutions available on the Atari Falcon030

(c) 1992 Atari Corp. Written by John Townsend

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This document may be re-printed again and again as long as the Atari

copyright remains intact.

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A couple of notes: Unlike previous machines, there are just too many

resolutions to give each resolution a name. Therefore, I will do my best to

describe what the resolution is and which monitor it is on.


 - NOTE: TV and a Color Monitor are the same.. by Color Monitor, I am

   talking about the standard SC1224. By VGA, I mean a standard VGA

   Monitor.


40 column modes ( "column" means the number of x pixels divided by 8)

---------------

   4 color,  normal, TV:         320x200,    4 colors, 2 planes

  16 color,  normal, TV:         320x200,   16 colors, 4 planes

 256 color,  normal, TV:         320x200,  256 colors, 8 planes

 True color, normal, TV:         320x200,  true color

   4 color,  interlace, TV:      320x400,    4 colors, 2 planes

  16 color,  interlace, TV:      320x400,   16 colors, 4 planes

 256 color,  interlace, TV:      320x400,  256 colors, 8 planes

 True color, interlace, TV:      320x400,  true color


   4 color,  normal, VGA:        320x480,    4 colors, 2 planes

  16 color,  normal, VGA:        320x480,   16 colors, 4 planes

 256 color,  normal, VGA:        320x480,  256 colors, 8 planes

 True color, normal, VGA:        320x480,  true color

   4 color,  line-doubling, VGA: 320x240,    4 colors, 2 planes

  16 color,  line-doubling, VGA: 320x240,   16 colors, 4 planes

 256 color,  line-doubling, VGA: 320x240,  256 colors, 8 planes

 True color, line-doubling, VGA: 320x240,  true color


80 column modes

---------------

   2 color,  normal, TV:         640x200,    2 colors, 1 plane

   4 color,  normal, TV:         640x200,    4 colors, 2 planes

  16 color,  normal, TV:         640x200,   16 colors, 4 planes

 256 color,  normal, TV:         640x200,  256 colors, 8 planes

 True color, normal, TV:         640x200,  true color

   4 color,  interlace, TV:      640x400,    4 colors, 2 planes

  16 color,  interlace, TV:      640x400,   16 colors, 4 planes

 256 color,  interlace, TV:      640x400,  256 colors, 8 planes

 True color, interlace, TV:      640x400,  true color


   2 color, normal, VGA:         640x480,    2 colors, 1 plane

   4 color, normal, VGA:         640x480,    4 colors, 2 planes

  16 color, normal, VGA:         640x480,   16 colors, 4 planes

 256 color, normal, VGA:         640x480,  256 colors, 8 planes

   4 color, line-doubling, VGA:  640x240,    4 colors, 2 planes

  16 color, line-doubling, VGA:  640x240,   16 colors, 4 planes

 256 color, line-doubling, VGA:  640x240,  256 colors, 8 planes


and lastly.. there are compability modes for ST Low, ST Medium, and ST High on

both VGA monitors and SC1224 monitors. (On a color monitor, ST High is

achieved by using the interlace mode).


Also, the ST Monochrome monitor (the SM124) will work with Falcon030 as well.

However, it only supports one resolution: ST High Resolution.


All modes on a TV can be overscanned. This means multiplying the X and Y

resolution by 1.2. For example, modes with 320 pixels of horizontal resolution

(X res) will become 384 pixels across, and modes with 640 pixels will become

768 across. Overscanning is done in the X and Y resolution. You can't do them

independently. Special Note: On a VGA monitor, overscan is "faked".. since the

video hardware doesn't have the capability to do overscan on a VGA monitor, we

made it so that if a overscan mode is set on a VGA monitor, you still see the

normal size screen, but the screen is a window onto the bigger overscanned

image. Make sense? We did this for compatibility. This way if a game that has

an overscanned starup picture can use the same pic on both the VGA monitor and

the TV monitor. Pretty cool, eh? <grin>


BTW.. Overscan can NOT be set from the desktop. The AES and Desktop will work

just fine with it, but because you can't see the parts of the screen, we

thought that that option shouldn't be available from the desktop. We don't

want to confuse people. However, Overscan can be set using a new XBIOS call

(Vsetmode()).. so it is still available.


I hope I haven't made any mistakes. I triple-checked this document in search

of errors and I couldn't find any. If you do find some, send me Email on GEnie

(to TOWNS) or CIS (70007,1135) and let me know.


-- John Townsend, Atari Corp.


PS. Anyone would would like to reprint this message, please do so!

    The smaller the number of times I have to type that message, the

    more my fingers with thank you! ;-)


    After looking at this one more time.. one point to clear up: By

    saying SC1224 Color Monitor, I mean any Color Monitor that Atari

    have manufactured for the ST/Mega/STE/MegaSTE computers. Clear

    as mud? ;-)


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