Actually the only thing that the Dreamcast shares with normal VGA is the res of 640x480,and the hardware was capable of producing a higher res,but that option was never used. The color depth far exceeds the old VGA standard,and the old VGA hardware standard was able to produce 704×528, 736×552, 768×576, and 800×600 at 16 colors.
When Super VGA was created the call was for 800x600 to be used more commonly. At the time they were not getting into 800x600 on VGA much,it was rarely done and at 16 colors, not very useful. However,SuperVGA can go back to 640x480. 640x480 on Dreamcast still uses SuperVGA color,along with the other aspects needed like the ability to double buffer at a color depth of 16-bit-32-bit. VGA high color depth is only 256 colors. I know,it must have slipped past you,but Power VR is a Super VGA hardware technology.
256 KiB ram was the limit for VGA.
The most typically standard graphics modes used in VGA are 640x480 in 16 colors, 640x350 in 16 colors, 320x200 in 16 colors,320x200 in 256 colors (Mode 13h) with typical res modes used for games like 320x400 double res,320x240 square pixel, and 360x480. I remember ColoRIX allowing you to do higher res while using 256 colors,but it would eat up all the available 256 kib ram fast and was not usable with games really.
As for Dscaler,yea,I have seen it used,and I think its good software tool,but I think its laughable at best that you are running a bunch of old game systems into a computer via capture card,and are having to use a software program to try to get your image to resemble the original look that a good $150-200 dollar Tv is going to give you anyway for your old game systems,but its not. A better solution would be to just use a good tv. Also,the color depth for the Dreamcast is much better on a computer monitor then a standard tv. SDTV dumbs it down somewhat in S-video.
I don't really care what you meant either way,you really do not know what your talking about,that much is apparent with your looping double backing post,and you think your going to win your retarded arguments here with people who do know,by using your poor wikipedia reference material and the point you keep making about how leet you are cause your using your computer and Dscaler to
TRY to do what a normal tv
WILL do for you instead. No matter how many times you post your same stupid mis informed info Joe nor I are going to agree with you,nor about anyone else here I gather. Infact,we are all laughing at you right now,laughing at you,laughing at you,laughing at you,laughing at you......
Lesson for the children