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 Forum index » DIY Hardware and Software » Circuit Bending
ZX81 - from "no sound" to... 6 channels.
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yerzmyey



Joined: Jun 30, 2003
Posts: 51

PostPosted: Wed Oct 17, 2012 8:03 am    Post subject: ZX81 - from "no sound" to... 6 channels.
Subject description: ym2149 sound-chips
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ZX81 - this ancient UK computer from 1981 year (thirst mother-boards have been actually produced even in 1980) had no sound in fact.
Posted Image, might have been reduced in size. Click Image to view fullscreen.
But the same year - 1981 there appeared sound-modules for it. So-called "ZonX" interfaces. Containing AY chip (or its Japanese version - ym2149), they gave to the ZX81 three channels of synthetic sound.
Posted Image, might have been reduced in size. Click Image to view fullscreen.

Of course since 80s nobody was producing this stuff for _years_ - until now. Wink
People took the schemes and made two new versions of the sound-module. Last times when I was in Germany (March) we had an idea to connect both modules to ZX81 and achieve 6 channels of synthetic sound from one ZX81. Wink So-called TurboSound.
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Posted Image, might have been reduced in size. Click Image to view fullscreen.

And - it appeared that it IS possible and it works fine. Smile
http://yerzmyey.i-demo.pl/zx81/03_Yerzmyey-UrsULA.mp3
http://yerzmyey.i-demo.pl/zx81/05_Yerzmyey-Break_Space.mp3

And looks like this:
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Of course the problem might be with separate sound-outputs but with any reasonable mixer (Behringer in my case) it's not any trouble.

My friend from UK made a composing program for this machine
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Still, one has to compose both halfs of the song (for on YM chip and for the second) separetely. But there is also a player that plays this stuff together, simultabously (as You can hear above).

Nice retro-work, heh.

More infos:
http://www.rwapsoftware.co.uk/zx812.html

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http://yerzmyey.i-demo.pl/ - retro-hardware electronic music
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telbonic



Joined: Jan 08, 2010
Posts: 38
Location: uk

PostPosted: Thu Oct 25, 2012 4:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Nice work! Makes me think back to all the time I spent swearing at a tape player wishing "load damn you LOAAADDD".
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