FUTURE: Add support for Mockingboard audio

bobbimanners / Applecorn

Allows Acorn BBC Microcomputer language ROMs to run on Apple //e enhanced, //c and IIGS.

GNU General Public License v3.0

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FUTURE: Add support for Mockingboard audio #178

Closed bobbimanners closed 1 year ago

bobbimanners commented 2 years ago

The existing code supports audio using the Ensoniq DOC of the Apple IIGS. It would also be valuable to support the Mockingboard in the //e (or could be GS, I guess!)

bobbimanners commented 1 year ago

Reference code: https://github.com/deater/dos33fsprogs/blob/master/music/pt3_lib/pt3_lib_mockingboard_setup.s

bobbimanners commented 1 year ago

This is now more-or-less implemented. The are some issues to be addressed though:

Pitch is poorly calibrated / sounds wonky!
The exponential 16-level amplitude is poorly matches to the linear 0..255 levels of the Beeb. Envelopes sound odd!

bobbimanners commented 1 year ago

Implemented. Will raise separate tickets for the known deficiencies.