jam wrote:
>
> Hola [EMAIL PROTECTED] !!!
>
> Leonard Silva de Oliveira le solto a jam:
>
> >>
> >> :? It sounds strange to me. I've got a Master System and I've seen
> >> a fantastic AY-3-8910 inside.
> LO>
> LO> The sega master system has a chip wich looks like the V9938
> LO> It's the VDP and is clocked at 10mhz ... Inside it has also the PSG.
> LO> There may be out other versions of the Hardware ... but the one I
>
> I think so. My Master System has a real ay-3-8910 inside.
>
> LO> meant has only 2 dedicated (SEGA) ICs one is the VDP/PSG and other
> LO> is the I/O chip. All the rest is 3 16kb pseudo SRAM chips (2 for vram
> LO> and one for the Z80)
> LO> And the Z80 iself.
>
> Right.
>
> >> RL> SN-something, slower than our one (and also it doesn't have
> >> RL> envelopes...)
> >>
> >> Hmmmm. I think you mean the SN76489A PSG. It's the ColecoVision one
> >> :)
> LO>
> LO> The model wich has the PSG inside the VDP uses this TEXAS INSTRUMENTS
> LO> PSG ... then it's probably that or you have a "pirate" Master system
>
> Well ..... SNxxxxxx and AY-3-891x ar both made by Texas Instruments.
> And, I remember .... I think there was an equivalent of AY-3-8910 named as
> SNxxxxxx, but it wasn't SN67489A, but something like this.
Sorry , but AY-3-8910 was created and manufacturated by General
Instuments (GI)
as part of the Mattel's Intelevision game system chipset, ASCII used it
on the MSX
system because of the I/O ports , wich could easily inplement the
Joystick ports
and the 3 sound generators ...
If you mail GI about this IC they will surely reply exactly what I said
...
Texas chip was cheaper because it was slower and had no envelopes.
Also Takes a look on the AY-3-8910 and you will see A HUGE GI
logo painted on it ! Hahahaha =)
> LO> or it isn't a master system or even it's a master system but is of
> LO> a diferent hardware version ...
>
> It is possible :)
Maybe your master system is a pirate copy ? =)
Cya MSXers ...
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