bhtooefr wrote:
Right, the VIDC1a didn't have HAM mode, and it had no blitter or copper, but it was able to run in 256 colors without resorting to any tricks. And, I'm pretty sure it could palette swap to get 4096 colors on the screen at once.
The question is whether the 8 MHz ARM2 could keep up with the combo of the 7 MHz 68000 and Agnus. (Obviously, if we were just comparing the CPUs, it'd be an embarrassingly easy win for the ARM.) If so, then the Archimedes could have better graphics in certain situations. :)
256 colour "chunky" mode was the holy grail on the Amiga by the end of it's life - that's something the Archimedes (and any PC with later versions of VGA with a linear framebuffer) could do by default. While we still played Monkey Island in 32 colours, the PC version had 256.
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(And, on the whole palette swapping thing, correct me if I'm wrong, but it certainly appears to me that the VIDC20 (as used in the RiscPC) can palette swap mid-scanline if the application in question has a palette other the system palette, so that each window can have its own palette, even if the window isn't the width of the screen. I run my RiscPC at 1600x1200 256 colors, so it's a nice feature to have.)
Indeed, similar architecture on the Amiga enabled screen dragging. You could change a colour at any point too - with some penalty (HAM fringing or a noticable border where the video cut out - drag a screen in a high resolution mode and the black bar at the top of the screen bar gets bigger).
Both were as quirky as each other, but the Amiga architecture offered more "fun" things to do, and weirder hacks you could play that weren't meant to happen just by the architecture (this is both cool, and absolutely horrible hardware design, and why it took so long to emulate it properly or complete a clone chipset). The Archimedes was far more reliable.. just like a PC with a VGA card did exactly what you told it, but nothing more.
Matt Sealey, Genesi USA Inc.
Product Development Analyst