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Re: SillyVenture 1-bit Compo

great news, it will be nice to listen to 1bit music on compo :-D

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Re: SillyVenture 1-bit Compo

Awesome tune Shiru, hyperactivity at it's best hehe. Too bad there weren't any more entries. You're welcome to blame me for that, too, though on the other hand you'd have steamrolled me with this one

Re: SillyVenture 1-bit Compo

Thanks! Well, at least it'll makes people on the SV aware of the GTIA capabilities, so maybe eventually they'll get more interested and it'll turn into a more popular compo. One issue, I believe, is lack of easy to use tools, the 1tracker support is quite clumsy at the moment - you need to manually re-edit data a bit, and assemble the engine with an external assembler. To be improved, of course.

website - 1bit music - other music - youtube - bandcamp - patreon - twitter (latest news there)

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Re: SillyVenture 1-bit Compo

people say Atari has the nicest sounding graphics chip :-)

GTIA = "Graphic Television Interface Adaptor"

30 (edited by Shiru 2022-08-14 08:38:04)

Re: SillyVenture 1-bit Compo

Oh, actually you're reminded me one interesting topic. I recall someone already attempted it, but generally it is totally underexplored, I believe. The idea is to generate audio using the video output. Like, we often put colored strips to the screen when a beeper engine is working (because Spectrum shares border color selection with the sound output bit). These strips actually produce voltage changes in the video signal at audible frequencies. It is possible to display patterns on the screen that will produce certain tones, and by changing the patterns it is possible to play music.

website - 1bit music - other music - youtube - bandcamp - patreon - twitter (latest news there)

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Re: SillyVenture 1-bit Compo

https://youtu.be/CxpAOMCtFvI?t=2525

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Re: SillyVenture 1-bit Compo

Shiru wrote:

Oh, actually you're reminded me one interesting topic. I recall someone already attempted it, but generally it is totally underexplored, I believe. The idea is to generate audio using the video output. Like, we often put colored strips to the screen when a beeper engine is working (because Spectrum shares border color selection with the sound output bit). These strips actually produce voltage changes in the video signal at audible frequencies. It is possible to display patterns on the screen that will produce certain tones, and by changing the patterns it is possible to play music.

Like this? https://github.com/luamfb/tempest-lcd
I also faintly recall nitro2k1 doing something along those lines on Gameboy.

Re: SillyVenture 1-bit Compo

Yes, this exact idea. Although I never seen this one, the one I saw was using Video RCA connector plugged into Audio input. Anyways, very cool stuff.

website - 1bit music - other music - youtube - bandcamp - patreon - twitter (latest news there)

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Re: SillyVenture 1-bit Compo

I think the sound will always be noisy by the extra bursts of horizontal and vertical sync

but... about Port 0xfe

> he lowest three bits specify the border colour; a zero in bit 3 activates the MIC output, whilst a one in bit 4 activates the EAR output and the internal speaker. However, the EAR and MIC sockets are connected only by resistors, so activating one activates the other; the EAR is generally used for output as it produces a louder sound. The upper two bits are unused.

is it possible to make one channel louder by using a different bit combination?

35 (edited by Shiru 2022-08-18 20:14:30)

Re: SillyVenture 1-bit Compo

This was a matter of discussion for several years on ZX scene, and the conclusion was that the difference between these volume levels is very subtle (a fraction of a volt) to be noticed by the ear; and this behavior is not replicated on most Amstrad models and clones. To my knowledge, no one ever actually tried it, though.

website - 1bit music - other music - youtube - bandcamp - patreon - twitter (latest news there)

36 (edited by utz 2022-08-18 20:17:54)

Re: SillyVenture 1-bit Compo

The problem is that a) MIC output is on average VERY quiet compared to EAR (-0.3V vs -5V and b) MIC output differs wildly across Speccy board revisions (let alone across models). So it's not that useful by itself, but I want to try and use MIC for reverb one day.

Edit: I tried it on my 48k (board rev 4B iirc), it was barely audible.

Re: SillyVenture 1-bit Compo

> Like this? https://github.com/luamfb/tempest-lcd

Weird coincidence that this was on Hack a Day only yesterday?
Or did someone send it into them..

https://hackaday.com/2022/08/18/lcd-mon … -the-hits/

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Re: SillyVenture 1-bit Compo

I stumbled across it on HackerNews, so quite likely it either came from there or Hackaday.