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--- sd:appendix_5_sound_system [2026/03/09 03:51] – appledog
+++ sd:appendix_5_sound_system [2026/03/28 09:05] (current) – appledog
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 == Introduction
 The SD-8516 is paired with the SD-450 sound subsystem; named for featuring 4 independent voices with 5 waveforms available, each with a programmable ADSR envelope. Let's dive in with an overview of the architecture and a quick look at INT 11h, the sound services library. If you are just interested in how to play sounds and music in your own games, you can skip ahead to [[#sound_and_music|Sound and Music.]]
-**''INTERNAL MEMO -- UPDATED JUNE 1985 -- We have decided to release the system with an updated SD-850 chip, now featuring EIGHT voices instead of four! The extra channels are continuous from the existing four, and follow the same convention.''**
 === Voice Architecture
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 ;            Theme B (16 bars) - Theme A reprise (16 bars) + coda
 ;
-; Usage:
 ; ============================================================================