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34 lines
1.1 KiB
Markdown
34 lines
1.1 KiB
Markdown
AWACS is an audio controller present on several Old World Macs and can usually be located at IOBase (ex.: 0xF3000000 for Power Mac G3 Beige) + 0x14000.
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New World Macs have a Screamer chip, which is backwards compatible with the AWACS chip, but with some additional capabilities.
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# Register Maps
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## NuBus Macs
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| Register | Offset | Length
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|:-----------------:|:------:|:------:|
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| Codec Control | 0x0 | 3 |
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| Codec Status | 0x4 | 3 |
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| Buffer Size | 0x8 | 2 |
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| Phaser | 0xA | 4 |
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| Sound Control | 0xE | 2 |
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| DMA In | 0x12 | 1 |
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| DMA Out | 0x16 | 1 |
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## PCI Macs
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All registers are 32-bit here.
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| Register | Offset |
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|:-----------------:|:------:|
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| Sound Control | 0x0 |
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| Codec Control | 0x10 |
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| Codec Status | 0x20 |
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| Clipping Count | 0x30 |
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| Byte Swapping | 0x40 |
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Separate volume controls exist for the CD drive and the microphone.
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The DMA buffer size is set to be 0x40000 bytes, while the DMA hardware buffer size is set to be 0x2000 bytes.
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