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Atari coding BBS
| Re: Paulo Simoes Lance replayer |
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Posted by: joska
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Jun,28.2015-16:07
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> I doubt that there is a way to have a fully OS compatible player as timer C is
> the system timer but timer D is also used for RS232 comunications.
> Of course you can say who cares about RS232 and you would be right at this
> stage.
Yes. Using Timer C means that you can't use GEM or access disks, atleast not with TOS 2 and higher. Timer D only affects the MFP serial port. So neither is ideal, but Timer D has less impact.
> A timer will always be required for BPM as you can see in the Amiga reference
> Protracker 2.x source (look for CIA programming).
I know too little about mods and modplayers. If I understand this correctly - BPM means a variable "tick" interval, right? Google say from 10ms to 78ms, whereas the old, VBL-based tick-length is fixed at 20ms.
I understand that this requires a timer on the Amiga, since playing mods on the Amiga is very different from on an STE (or a PC for that matter). On the Amiga you need to instruct Paula to change sample, frequency and volume in real time, whereas on the STE/TT/Falcon the CPU copies and mixes the samples to a buffer and applies effects/pitch while doing so. Then the DMA hardware outputs this buffer at a fixed sample rate. So there would be no need for a timer to use BPM in this case - except for volume as your player use the LMC for this and thus needs to do this in real-time.
I wonder how much sound quality will suffer if volume is adjusted per VBL instead? It would make the player a LOT more useful in demos/games since you don't have to worry about timer C when doing rasters/screensplits/border busting. The Timer C handler in your code is pretty short though. A bit busy this weekend but will try to experiment a bit with this. Very interesting stuff, I've had Ataris since 1988 but have never really looked into audio until now.
> You can scrap that and move it always to the VBL but you may loose some
> quality.
I did scrap that and I can't hear any difference on my STE.
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Topic
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Posted by
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Date
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Paulo Simoe's Lance replayer
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joska
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Jun,18.2015-13:54
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Re: Paulo Simoe's Lance replayer
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evil
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Jun,18.2015-15:38
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Re: Paulo Simoe's Lance replayer
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joska
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Jun,18.2015-20:22
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Re: Paulo Simoe's Lance replayer
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joska
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Jun,19.2015-11:10
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Re: Paulo Simoe's Lance replayer
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Grazey/PHF
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Jun,19.2015-18:52
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Re: Paulo Simoe's Lance replayer
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joska
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Jun,20.2015-11:53
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Re: Paulo Simoe's Lance replayer
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joska
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Jun,21.2015-22:46
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Re: Paulo Simoe's Lance replayer
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joska
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Jun,22.2015-01:11
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Re: Paulo Simoe's Lance replayer
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mikro
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Jun,22.2015-08:15
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Re: Paulo Simoe's Lance replayer
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joska
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Jun,22.2015-09:00
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Re: Paulo Simoe's Lance replayer
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ljbk
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Jun,24.2015-14:16
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Re: Paulo Simoe's Lance replayer
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joska
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Jun,24.2015-15:28
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Re: Paulo Simoes Lance replayer
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ljbk
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Jun,24.2015-21:04
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Re: Paulo Simoes Lance replayer
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joska
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Jun,25.2015-00:20
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Re: Paulo Simoe's Lance replayer
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joska
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Jun,26.2015-10:30
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Re: Paulo Simoe's Lance replayer
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evil
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Jun,26.2015-12:01
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Re: Paulo Simoe's Lance replayer
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joska
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Jun,26.2015-13:25
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Re: Paulo Simoes Lance replayer
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ljbk
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Jun,26.2015-19:34
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Re: Paulo Simoes Lance replayer
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ljbk
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Jun,26.2015-19:36
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Re: Paulo Simoes Lance replayer
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ljbk
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Jun,26.2015-20:00
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Re: Paulo Simoes Lance replayer
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joska
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Jun,26.2015-20:53
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Re: Paulo Simoes Lance replayer
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ljbk
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Jun,26.2015-23:09
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Re: Paulo Simoes Lance replayer
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joska
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Jun,28.2015-18:38
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Re: Paulo Simoes Lance replayer
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joska
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Jun,29.2015-14:38
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Re: Paulo Simoes Lance replayer
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evil
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Jun,27.2015-18:10
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Re: Paulo Simoes Lance replayer
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ljbk
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Jun,27.2015-22:32
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Re: Paulo Simoes Lance replayer
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joska
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Jun,28.2015-16:07
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Re: Paulo Simoes Lance replayer
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joska
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Jun,28.2015-16:09
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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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