samkusin/clemens_iigs

Mockingboard support

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Support Mockingboard (6522 VIA and AY3 891x hardware) audio playback for various Apple II titles.

As a step towards Ensoniq support, implement Mockingboard 2 channel playback (without SSI-223 voice support for now.) Accurate as possible playback will provide some confidence towards eventually completing the Ensoniq portion of the emulator.

Validation for the hardware side involves passing the [mb-audit test suite] (https://github.com/tomcw/mb-audit). Audio quality testing will have to involve "by ear" validation from playing a couple titles and comparing to reference videos.

Completed per #6