Changes
PSG
,/* Chip Variants */
The PSG chip family is composed of 3 variants: the AY-3-8910 with two 8-bit I/O ports, the AY-3-8912 with one 8-bit I/O port and the AY-3-8913 with no I/O port. In addition to the CPC, these chips were also used in the [[ZX Spectrum]], [[MSX]], [[Oric]], [[Vectrex]] and [[Intellivision]].
Yamaha produced a derivative SSG (Software-controlled Sound Generator) chip family. This chip equips the [[Atari ST]]. The main difference is that the SSG offers 32 volume levels for the envelope, while counter on the PSG provides only has 16steps. On the SSG it has twice the steps, happening twice as fast.
The SSG has also been integrated as a component inside every chip of the Yamaha OPN family.
