Michael Laajanen wrote:
> HI,
>
> Paul Gress wrote:
>> Dave (from the UK) wrote:
>>
>>> Title pretty much says it all. I've just bought a U60 (the result of
>>> answers from my U5 vs U 60 post) and just wondered what the -m6 does
>>> that the -m3 does not? I had a -m3 before, but swapped it for a
>>> Creator3D, since I wanted 1600x1200.
>>>
>>> I suspect I'll run headless 99% of the time, so are a bit less
>>> concerned now, but just wondered what the differences were. Can't
>>> find out from the Framebuffer FAQ.
>>>
>>
>>
>> The Elite3D-M3 has 3 floating processor units, and the -M6 has 6
>> floating processor units. The -M6 would be faster for processing 3D
>> vector data, twice the amount of floating processor units would allow
>> for double "Z" buffering, basically while displaying one frame (using
>> 3 floating processor units) and calculating in advance the next frame
>> with the additional 3 floating processor units.
>>
>> Paul
>
> You wrote that 3 FPU are used during display in double buffering mode,
> what are they doing during display?
>
> Is not "display" just a DMA to the DAC from the refresh memory(read
> active memory half in double buffering mode) while the FPU and CPU are
> using the (write active half of the display memory) for creating the
> next memory buffer?
>
>
> /michael

Maybe I got a little ahead of myself. The 6 FPU's are used for
calculating the vector rendering. Alternating 3 at a time. So 3 are
working what will currently be displayed, and 3 for the future frame. I
guess the display would be DMA to the DAC, but this card is a UPA
interface and I'm not sure if it's DMA.

Paul