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Atari coding BBS
| Re: Synclock & Loading from floppy |
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Posted by: evil
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Nov,05.2012-21:38
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About floppy + top border, no idea, don't think I've ever seen it. But hum, I wonder if I havn't seen hardsynced rasters while loading. Oh yes, the Stupendous demo loader. Check out this video: http://dhs.nu/video.php?ID=575 hardsync rasters, loading and digidrums.
About that animation player, I thought about it for a while.
1. It loads from cartridge port, with some sort of hardware mod
2. It uses direct access to the drive, no OS filesystem
3. Apparently reading from the disk is exactly as fast as reading from memory
It's very tight on CPU, 320*199 25 fps bitmap + 199 lines palette + audio. The calculation I come up with is something like;
* 1 scanline for hardsync + reading some audio
* 199 scanlines feeding palette registers directly from disk to registers + reading some audio in the free cycles
* 113 scanlines reading bitmap data to memory
The bitmap is the tricky part, 160*199/2 = 15920 bytes/vbl and to read that in only 113 scanlines. Hmm :) I guess it depends how the interface to the cartridge is working, perhaps it has a buffer so he can read it with movem.l.
In any case, this is not doable over ACSI which is DMA (like floppy), no realtime feeding of colour data directly to registers there. Then the question comes to how the heck to control the ACSI DMA to only work on scanlines 0-65 and 266-312.
I very much like the animation stuff he has going, but people read into it as something the STe can do just like that, and are awaiting a generic converter to run with their megafile or ultrasatan. That won't happen.
--
Anders Eriksson
ae@dhs.nu
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[All messages in this thread] [Start new thread]
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Topic
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Posted by
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Date
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Synclock & Loading from floppy
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Defjam
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Nov,05.2012-18:12
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Re: Synclock & Loading from floppy
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evil
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Nov,05.2012-21:38
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Re: Synclock & Loading from floppy
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defjam
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Nov,06.2012-16:00
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Re: Synclock & Loading from floppy
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calimero
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Nov,06.2012-16:05
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Re: Synclock & Loading from floppy
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ggn
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Nov,06.2012-20:28
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Re: Synclock & Loading from floppy
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CiH
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Nov,05.2012-21:59
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Re: Synclock & Loading from floppy
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ggn
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Nov,06.2012-08:34
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Re: Synclock & Loading from floppy
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Leonard
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Nov,06.2012-03:12
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Re: Synclock & Loading from floppy
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Alien / ST-CNX
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Nov,13.2012-05:59
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Re: Synclock & Loading from floppy
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Petari
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Nov,13.2012-16:45
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Re: Synclock & Loading from floppy
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ggn
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Nov,13.2012-19:13
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Re: Synclock & Loading from floppy
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mikro
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Nov,13.2012-19:18
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Re: Synclock & Loading from floppy
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Petari
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Nov,14.2012-11:49
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Re: Synclock & Loading from floppy
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Mr. Styckx
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Nov,14.2012-16:37
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What's the anti-troll code?
That's your personal code to be able to add comments and messages on the dhs.nu site.
Don't have a code or forgot it? Fix it here.
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