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Title: Z80 and sound chip frequencies
Post by: Abrimaal on 16:38, 08 June 15

How many configurations of Z80 frequency and sound chips exist? The default config is Z80 @4MHz and 1xAY @1MHz.
I mean how many presets should be reserved for CPC identification and emulation in the updated .ay format,
before we go to the next machine.

Title: Re: Z80 and sound chip frequencies
Post by: TFM on 19:42, 08 June 15

Please consider PlayCity with this. :)

Title: Re: Z80 and sound chip frequencies
Post by: robcfg on 20:07, 08 June 15

Spectrums have 1.77 mhz AY chips, and Atari ST machines have a 2 mhz AY chip. Why do you ask in relation to the z80 frequency? The AY chip is quite cpu independent, and the clock frequency can be independent of the cpu clock too...

Title: Re: Z80 and sound chip frequencies
Post by: McKlain on 20:30, 08 June 15

All the CPC models use the "default" config, Z80 @4Mhz and 1xAY @1Mhz. There are no variants.

The PlayCity is a sound expansion launched in 2014.
PlayCity - CPCWiki (http://www.cpcwiki.eu/index.php/PlayCity)

CPCWiki forum

General Category => Amstrad CPC hardware => Topic started by: Abrimaal on 16:38, 08 June 15