Anyone know anything about it? I just picked one up because it looked interesting (dual R128Pro chips). They are cheap now because there is no more driver support from ATI. I see on the DRI page that it is unsupported but wondered if any folks with R128 docs had more info about it, esp how the two chips divide up rendering tasks. Also, was there a dual head version made? There is a place on the board for a second VGA connector, but I can't find any info about that either.
I seem to recall those boards were basically two Rage128 chips and a PCI bridge. Each chip would take turns rendering frames. When the driver got a SwapBuffer command, it would queue the swap, and start issuing drawing commands to the other chip. This mode of operation is somewhat interesting, but ATIs drivers had tons and tons of problems. I'm pretty sure each chip had its own memory, so are sure to be issues like uploading textures to both chips, etc.
What might be more interesting is to have half of the GL contexts render with one chip and the other half render with the other chip. It would basically operate (from the driver's perspective) like you had two separate cards in the system. This may or may not work depending on how buffer swaps work on that card. If one chip always acts as the display, and the other chip copies to the display chip's memory, it would work. If swaps work only by switching which chip is driving the display, well, you're hosed. :(
Now that I think about it, that's probably how the card works. That would explain some of the problems & limitations the Windows drivers had. Hmpf. Still, it might be a fun pet project.
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