Organization: The Back Burner BBS (via C-Net Amiga)
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640x480 mode in 256 colors using DBLNTSC is CONSIDERABLY slower than a MacII series computer running a similar display and even a clone running a 256color VGA screen. Applications in 256 colors are painfully slow (most notibly workbench). I have tried Final Copy II in 256 colors and it is not bad, but does slow down considerably. (If you want specs, I can't give them to you, but as a user of all 3 platforms I can only make observations)
You CANNOT expand past 2 megs of chip ram. There is a jumper on the motherboard that says 2 meg chip/4 meg chip/etc.. But it is NON functional, and my dealer tells me it was at one time under consideration, but that the final production models were shipped with a 2 meg maximum capacity.
As far as exact figures on drawing speed etc... I don't have them, but I can tell you that the 4000 updates the display MUCH quicker than a 3000. Ie. A picture that took 14 seconds to fully render under ADPro on a 3000, took less than 3 seconds on my 4000 (I know the 040 is to be given credit for part of the speed up, but the screen refresh rate is NOTICABLY faster)