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