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Amstrad CPC: Backtro by Overflow - http://CPCrulez.free.fr

Backtro Amstrad CPC Demo by Overflow  
 
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csg8501 (6 months ago) Show Hide
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The drums are a little bit out of beat. Anyway, could some of you give me some clue about how these digi sounds are played on the CPC? AFAIK the AY is interfaced in a pretty lazy way (it's hooked to the data ports of a '8255), so it should be relatively slow to handle, and AFAIK there's no decent IRQ subsystem in the CPC (thus digis should be pretty hard to play). I might miss something (a clever hack to provide fast timer interrupts, maybe....)
MikeGTR1983 (8 months ago) Show Hide
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Nie polecam ogladania na kacu :/
CoolDudeClem (8 months ago) Show Hide
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The music is "sharpness buzztone" by Jean Sebastian Gerrard aka Jess (I think). I originally heard this on Atari ST. I'm going to the website no to find this demo and run it on my CPC Emulator.
Gunstick (10 months ago) Show Hide
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I guess 90% of the CPU time is used for the Music :-)
fulansujin (6 months ago) Show Hide
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I am unsure of this. It was digitalised voices that would totally interupt the Zilog Z80.
asicys (6 months ago) Show Hide
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Guess again ;-)
Gunstick (6 months ago) Show Hide
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hmm, let's guess... so there are digital drums. How much CPU does that need on the CPC? And second part has SID effect, takes also some CPU...
asicys (6 months ago) Show Hide
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The digidrums take about 25-35%. The SID effect needs much higher cpu computation but the effect is not as complex as the first one (color cycling and page flipping), And if I'm not wrong it uses an interrupt player. There' s another player for the amstrad plus (see my killmax video) that uses the dma processor, supports 2 sid voices and takes almost no cpu time.
Gunstick (6 months ago) Show Hide
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That's quite optimized. wow. DMA for sound.... now that's one cool trick. Checking out that video.

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