13.5 OTHER I/O CONNECTIONS
A number of I/O architectures lie outside the realm of the SCSI-3 architecture model but can interface with it to some degree. The most popular of these is the AT Attachment (ATA) used in most low-end computers. Others, designed for computer architectures apart from the Intel paradigm, have found wide application on various platform types. We describe a few of the more popular I/O connections in the sections that follow.
13.5.1 Parallel Buses: XT to ATA
The first IBM PCs were supported by an 8-bit bus called the PC/XT bus. This bus was accepted by the IEEE and renamed the Industry Standard Architecture (ISA) bus. It originally operated at 2.38MBps, and it required two cycles to access a 16-bit memory address because ...
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