LSI SYM8953U manual Port Address, Port Number, Queue Tags, Risc Core, Scsi Bus

PIO	Programmed Input/Output. A way the CPU can transfer data to and from
	memory using the computer’s I/O ports. PIO is usually faster than DMA,
	but requires CPU time.
Port Address	Also Port Number. The address through which commands are sent to a
	host adapter board. This address is assigned by the PCI bus.
Port Number	See Port Address.
Queue Tags	A way to keep track of multiple commands that allow for increased
	throughput on the SCSI bus.
RAM	Random Access Memory. The computer’s primary working memory in
	which program instructions and data are stored and are accessible to the
	CPU. Information can be written to and read from RAM. The contents of
	RAM are lost when the computer is turned off.
RISC Core	LSI Logic SCSI chips contain a RISC (Reduced Instruction Set
	Computer) processor, programmed through microcode scripts.
ROM	Read Only Memory. Memory from which information can be read but not
	changed. The contents of ROM are not erased when the computer is
	turned off.
SCAM	SCSI Configured AutoMatically. A method to automatically allocate SCSI
	IDs using software when SCAM compliant SCSI devices are attached.
SCSI	Small Computer System Interface. A specification for a high-performance
	peripheral bus and command set. The original standard is referred to as
	SCSI-1.
SCSI-2	The current SCSI specification which adds features to the original
	SCSI-1 standard.
SCSI-3	The SCSI specification which adds features to the SCSI-2 standard.
SCSI Bus	A host adapter and one or more SCSI peripherals connected by cables
	in a linear chain configuration. The host adapter may exist anywhere on
	the chain, allowing connection of both internal and external SCSI
	devices. A system may have more than one SCSI bus by using multiple
	host adapters.

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