Better music capabilities

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Por eimaster

Master (221)

imagem de eimaster

08-12-2017, 07:56

When I listened to some ZX-Spectrum game music I could clearly hear drums and things like high hit-hat and close hit-hat, snare, etc. which you don't hear in MSX PSG game music!
So does ZX-Spectrum sound generator more advance than MSX1 or what? And what are the features of it?!

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Por JohnHassink

Ambassador (5408)

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08-12-2017, 08:09

No, it's exactly the same PSG; the AY-3-8910.
Could you give an example of things you hear in Spectrum music which you didn't hear on MSX PSG?

Por Pencioner

Paladin (933)

imagem de Pencioner

08-12-2017, 08:59

What if some Spectrum games used PSG + its speaker (i believe latest machines with PSG still have that legacy speaker of 1st versions), and that's why it look like an extra channel suitable for hi-hats, snares etc? (I'm now aware, it is just a wild guess)

Por syn

Paragon (1920)

imagem de syn

08-12-2017, 09:16

What legacy speaker do you mean?

Por hamlet

Scribe (2473)

imagem de hamlet

08-12-2017, 10:34

The specci have an build in speaker, which provides the same sound channels as the external EAR and TV output. There is no extra channel except maybe the rattle of its plastic case.
There wasn´t much MSX with build in speakers?

Por Grauw

Ascended (8406)

imagem de Grauw

08-12-2017, 11:45

The AY3 was only added in the ZX Spectrum 128. The previous models only had something akin to the key click on MSX, which can produce tones by software-controlled oscillation (through a BIOS call). It does consume the full CPU while playing a tone though, so if you ask me it’s unlikely that it’s used in combination with the AY3.

Por hamlet

Scribe (2473)

imagem de hamlet

08-12-2017, 11:43

So the plus model could add a "click" to the AY3 sound? Or does the AY3 replace the click chip?

Por Grauw

Ascended (8406)

imagem de Grauw

08-12-2017, 11:52

The key click on MSX is only a click because it’s toggled between 0 and 1 state once. If you toggle it at 440 Hz, you get a middle A square wave sound, just like on the Spectrum. It’s not really a chip either, just some GPIO (from the PPI in the case of MSX) which is mixed into the audio signal.

The AY3 on the 128 does not replace the beeper, it has both, although the speaker disappeared and both are output through the TV.

Por hamlet

Scribe (2473)

imagem de hamlet

08-12-2017, 11:52

So it would be possible to add a percussion voice, like eimaster asked?
I know this is not a Sinclair forum I even haven´t a Spectrum, but this is a nice hack.

Por Grauw

Ascended (8406)

imagem de Grauw

08-12-2017, 11:59

The beeper (Spectrum) / key click (MSX) can be used to have an additional square wave or noise channel in addition to the AY3, but since it requires 100% CPU it means you can’t do anything else while it’s sounding.

Also, it has no volume control.

Por hamlet

Scribe (2473)

imagem de hamlet

08-12-2017, 11:58

Does it work on MSX a similar way? Or is the MSX click produced by the AY3?

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