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22 lines
771 B
Markdown
22 lines
771 B
Markdown
The Heathrow is an I/O subsystem and a DMA controller.
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It contains a feature control register, an auxiliary control register, and some registers to save states for the DBDMA and the VIA Cuda.
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It also contains the emulations for the VIA Cuda, SWIM 3 floppy drive, ESCC, and MESH components.
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# Register Map
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| Register Name | Offset |
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|:-------------------:|:------:|
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| Interrupt Events 2 | 0x10 |
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| Interrupt Mask 2 | 0x14 |
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| Interrupt Clear 2 | 0x18 |
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| Interrupt Levels 2 | 0x1C |
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| Interrupt Events 1 | 0x20 |
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| Interrupt Mask 1 | 0x24 |
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| Interrupt Clear 1 | 0x28 |
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| Interrupt Levels 1 | 0x2C |
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| Chassis Light Color | 0x32 |
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| Media Bay Control | 0x34 |
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| Feature Control | 0x38 |
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| Auxiliary Control | 0x3C | |