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Originally Posted by Thorham
That's an illusion. 320x256, 640x256 and 1280x256 are all the same resolution. Hint: SVGA CRTs and flat panels don't switch modes when switching between these compatible resolutions. These are not different resolutions in this context.
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Sorry, but that is wrong. Resolution is the number of pixels or lines across and down the screen. 31kHz is a
scan rate. A CRT has no concept of horizontal resolution, it only knows about brightness and line width. LCD panels have scalers that try to lock onto the pixels and then stretch them if necessary, often resulting in a poor display if the signal resolution doesn't match the LCD panel's native resolution.
Yes, for screen dragging each screen needs to have the same horizontal
scan rate, but the
resolutions can be different. And we are not just talking about stretching pixels, but actual hardware differences like number of bitplanes, color palette etc. The Amiga is far more flexible here than PC graphics cards of the day.
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It's an OS feature that they didn't add.
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An OS feature they
couldn't add with the original VGA card, and with limited success on (some) later cards.
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Any recent graphics card can do that pretty easily because the resolutions are just doubled like in my example above.
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It's not just a matter of changing pixel clocks, but also where to fetch data from, color palettes etc. You may be right that modern graphics cards can do this on a line by line basis, but older ones couldn't.
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In fact, a graphics card can do this better than an Amiga because it can do proper up scaling so that you can mix truly different resolutions like 640x512 and 800x600.
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Scaling is a different thing. Now you
are talking about converting different resolutions to be all the same, with results that may not be very satisfactory.
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If it's better than anything we have now, it would've been better than anything available back then.
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Yes, I believe that was the plan.
