Sound chips

From: Iggy Drougge <>
Date: Fri Jun 15 15:04:50 2001

John Honniball skrev:

>On 13 Jun 2001 4:38:45 +0100 Iggy Drougge
><> wrote:
>> For those of you who don't know, the CPC had an AY-3-8910. The same chip
>> could be found on late Spectrum models and apparently also in the Research
>> Machines Nimbus. The Atari ST uses a Yamaha clone of the same chip, called
>> YM2149. I believe that the MSX uses such a chip, too.

>I think MSX includes the AY-3-8910, yes. So does the
>Vectrex vector-scan video game console (6809 CPU).

I checked (of course I had a file with MSX info on my hard drive, silly me),
and indeed it's got an AY-3-8910, though I wouldn't be surprised if many used
the YM2149 considering the Japanese origin of many MSXes. I think I'll have a
look in mine, though they are respectively Korean and Hongkongese (I think I
just discovered a pothole in the English language =).

>> Another question: The Sega Master System and the BBC use an SN76489 sound
>> chip. Both the AY/YM chip and the SN one are "PSG" chips. That means that
>> they've got three square wave channels and a noise channel which may (at
>> least on the AY/YM) be mixed with the square channels. But are those chips
>> related, or are they just chips which happen to use the same techniques?

>Unrelated, as far as I know.

There can't be that much of a difference sound-wise, though, seeing as they're
both PSG, right?

>Wasn't there an SN76488 sound chip that was analog, as
>opposed to the digital SN76489? And has enyone ever seen
>or used the Yamaha FM synthesis chip that was upward
>compatible with the YM2149?

The SN76489, that was a Philips chip, right? It was used in some late eight-
bit UK micro, right? Was it the SAM Coup? or the Enterprise?
Why not just have a look at the hard drive once again? =)
Nope, the Enterprise had a Philips SAA1099. Six channels, eight octaves (don't
ask me what that means, I suppose it's some fancy way of saying X to X Hz).
So who used the SN chip and who made it? And how does one use an analogue
sound chip?

This URL, if it still exists, could come in handy:

There is a datasheet for the SN76489 at:
It's just a load of scanned images, but can't the data sheets be ordered from
the manufacturer, then?

En ligne avec Thor 2.6a.
Computers are not intelligent. They only think they are.
Received on Fri Jun 15 2001 - 15:04:50 BST

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