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

[TheStalker1979]

La seconde partie est encore plus dingue ! absolument *****

[TheStalker1979]

Extraordinaire tout 'simplement' et la musique est à coupé le souffle

[hivkorn]

AMAZING!!!!! O_O A STUFF LIKE THAT ON A CPC!!!

[khisanth75]

Amazing stuff!!!!! Love it :)

[wysmiewisko]

Is this realtime calculated, or is this just animation?

[Gmoooba]

@wysmiewisko This long animation on a CPC would be actually even more impressive than realtime calculation of it all..

[csg8501]

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]

Nie polecam ogladania na kacu :/

[CoolDudeClem]

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]

I guess 90% of the CPU time is used for the Music :-)

[fulansujin]

I am unsure of this. It was digitalised voices that would totally interupt the Zilog Z80.

[asicys]

Guess again ;-)

[Gunstick]

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]

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]

That's quite optimized. wow. DMA for sound.... now that's one cool trick. Checking out that video.

[fulansujin]

Hallucinant la facon dont les limites cette machine sont sans cesse repossées.

[VectorOmega]

Is there an Amstrad CPC emulator for Mac OS X?

[zewbo]

nope. turns out theres a lot of things mac users can't do!

[aufsturz]

of course there are! just google it

[aufsturz]

yessss

[SalvatorQuaro]

I guess a mac would be to slow to watch full quality.

[RulerRyze]

Excellent demo.

I'd like to download and run these natively on my old 464. Any idea where I'd find the source files or some MP3s I can record to tape?

[andyukmonkey]

i doubt they would run on a 464. Most demos use 128k so only a 6128 or a 464 with a ram pak would work.

Also they're probably for disk only machines.

[gryz0r]

Not only is this unbelievably cool, the music is fantastic as well!!!

[Optimus6128]

What can I say about that? I can't find any words. Overflow you are crazy!!!

[xeirwn]

Overflow is the BEST demomaker on Amstrad CPC without doubt! He coded unbeliavable stuff for an 8 bit machine!! Thanks for posting....

[muguk]

A nicely done demo with some classic Atari ST music conversions ... .

[shpearg]

nice music

[skunkfish83]

Nice effect