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HW request: DMA copy fast->chip

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peskanov
Post subject: HW request: DMA copy fast->chip
Posted: Sat 3 Mar 2018 12:18
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Hello there,
I am a demoscene coder interested in the Vampire accelerator.
I have to say I am really impressed with what you guys has accomplished and I am eager to get the upcoming Vampire for A1200!

There is one feature that would make the board very interesting to me for demomaking, and probably for others. I'm pretty sure the 68080 can do the c2p family of algorithms really fast, but as everybody knows we have the chip memory speed bottleneck.

What about implementing a DMA system to copy memory blocks asynchronally from FAST to CHIP?
That way we can implement 50 hz effects using full screen, even HAM6/HAM8 ones. Or going hires 256 colors...

I know many people will prefer to skip AGA completely and going RTG, or using the FPGA AGA replacement wich does not have the bottleneck problem...As for me, I like toying with good old AGA chipset and seeing the results through an ancient Commodore 1084 :)


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bax
Post subject: Re: HW request: DMA copy fast->chip
Posted: Tue 6 Mar 2018 20:11
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peskanov wrote: *  Sat 3 Mar 2018 12:18
What about implementing a DMA system to copy memory blocks asynchronally from FAST to CHIP?
That way we can implement 50 hz effects using full screen, even HAM6/HAM8 ones. Or going hires 256 colors...

I know many people will prefer to skip AGA completely and going RTG, or using the FPGA AGA replacement wich does not have the bottleneck problem...As for me, I like toying with good old AGA chipset and seeing the results through an ancient Commodore 1084 :)
I don't think that there would be much interest in this particular topic. You've mentioned the main reason of a fast on-card framebuffer already.
Secondly: as soon as the AGA Chipset implementation is ready for prime time, you'll get ChipRAM with the same speed as FastRAM.

Even a 1084 could be connected using a DigitalOut to SCART adapter/conversion device since the timing in ECS/AGA modes conforms to timings still available with DigitalOut.

_________________

A500 Rev8a1, V500 V2, ECS, 1.5 MB Chip, 32 GB CF
A500 Rev5, 1 MB Chip, 2 MB Fast, A590 + SCSI2SD
A4000, CS060MK-I 50 MHz, 112 MB Fast, AriadneII, Scandoubler, MelodyZ2, CV64
A500 Rev8b, Project Red a1k edition


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peskanov
Post subject: Re: HW request: DMA copy fast->chip
Posted: Sat 17 Mar 2018 21:44
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I guess I get a kick from trying new things with old AGA+1084 monitor set. Trying twisted things with an AGA fpga replication does not seem to make much sense...

And I still like the old CRT pixel. In my experience, nothing seems to replicate that visual experience, although there is some PAL emulations that come quite close.


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