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The Heathrow IC is an I/O controller and DMA engine for Power Macintosh computers using the PCI bus architecture.
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The Heathrow IC is an I/O controller and DMA engine for [[Power Macintosh]] computers using the [[PCI]] bus architecture.
    
Heathrow also provides power-management control functions for energy saving features included on Power Macintosh computers. The Heathrow IC is connected to the PCI bus and uses the 30–33 MHz PCI bus clock.  
 
Heathrow also provides power-management control functions for energy saving features included on Power Macintosh computers. The Heathrow IC is connected to the PCI bus and uses the 30–33 MHz PCI bus clock.  
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* 8 KB nonvolatile RAM control  
 
* 8 KB nonvolatile RAM control  
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The SCSI controller cell in the Heathrow IC is an 8-bit MESH controller. The MESH cell supports data transfer rates of 5 MB per second.
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The [[SCSI]] controller cell in the Heathrow IC is an 8-bit MESH controller. The MESH cell supports data transfer rates of 5 MB per second.
    
The Heathrow IC also contains a serial interface and sound control logic for the Screamer sound IC on the Audio/Video and Audio input/output cards.
 
The Heathrow IC also contains a serial interface and sound control logic for the Screamer sound IC on the Audio/Video and Audio input/output cards.
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The 85C30 SCC cell in the Heathrow IC is an 8-bit device. The SCC circuitry supports serial and LocalTalk protocols.  
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The 85C30 SCC cell in the Heathrow IC is an 8-bit device. The SCC circuitry supports serial and [[LocalTalk]] protocols.  
    
=See Also=
 
=See Also=
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[[Category:Apple]]
 
[[Category:Apple]]
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[[Category:Definitions]]

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