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Initial Program Load (IPL): a feature built into
IPL: see Initial Program Load.
IRQ (Interrupt Request): an electronic request that runs from a hardware device to the CPU. The interrupt controller assigns priorities to incoming requests and delivers them to the CPU. It is important that there is only one device hooked up to each IRQ line; doubling up devices on IRQ lines can lock up your system.
ISA (Industry Standard Architecture): a slower 8- or
Latency: the amount of time that one part of a system spends waiting for another part to catch up. This is most common when the system sends data out to a peripheral device, and it waiting for the peripheral to send some data back (peripherals tend to be slower than onboard system components).
Mirroring: see RAID.
NVRAM: ROM and EEPROM are both examples of
OEMs (Original Equipment Manufacturers): Compaq or IBM package other companies’ motherboards and hardware inside their case and sell them.
Parallel port: transmits the bits of a byte on eight different wires at the same time (that is, in parallel form, eight bits at the same time).
PCI (Peripheral Component Interconnect): a 32 or
PCI PIO (PCI Programmable Input/Output) modes: the data transfer modes used by IDE drives. These modes use the CPU for data transfer (in contrast, DMA channels do not). PCI refers to the type of bus used by these modes to communicate with the CPU.
Pipeline burst SRAM: a fast secondary cache. It is used as a secondary cache because SRAM is slower than SDRAM, but usually larger. Data is cached first to the faster primary cache, and then, when the pri- mary cache is full, to the slower secondary cache.
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