ISA (Industry Standard Architecture)

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ISA (Industry Standard Architecture)

In common parlance, almost always referred to only as ISA, describes the Industry Standard Architecture a computer bus that is used to connect peripherals. The development took place in the 80s at IBM, since the mid-90s, however, he was more and more replaced by PCI. Today there are almost only used PCs that have an ISA slot on the motherboard, although some hardware components such as the floppy drive will continue addressed by software through ISA. In particular, in the industry of the ISA bus can, however, play an important role, because through this often, for example, Machines to be addressed. Therefore, yet you also get us used computers with ISA slot to avoid new investments and higher to be able to return to usual work routine.

What characteristics distinguish ISA?

ISA standard extends the older XT bus, and operates at a bus width of 16 bits. However, it is backward compatible with the XT-bus (8 bits wide), which is why almost all older XT cards can still be used. In the last case, but only the first part of the ISA slots will then be used, for only the 16-bit ISA cards fill it out completely. In addition, the bus width has been doubled again to 32 bits by EISA (Extended ISA). But even this is downwards compatible to its two predecessors, and is further extended to the slot identified. Regarding the configuration, there are other differences to aktuellerem PCI and PCI Express standard, because there are two types of ISA cards. The legacy ISA cards, the required system resources must be manually assigned (IRQ, DMA, IO-Base, Mem-base). This is done either via jumpers (also called jumpers), DIP switches or software using the driver. It is important first of all that no resources twice will be awarded. An ISA-PnP card (PnP Plug and Play), however, allows the BIOS if it supports this feature, automatically assigned system resources. It may be possible to assign also be done by the operating system if it performs the hardware management itself. In an EISA card, however, an automatic allocation is not possible in any case.

What are ISA cards used?

Through ISA cards you can upgrade various functions in the computer. Thus, there are, for example, Sound and graphics cards, but also ISDN cards for connecting fax services and the like. The selection is very large and so can be found in our various used ISA cards for your system.

Are there any current PCs with ISA interface?

Even today modern computer with at least one ISA slot are made on the mainboard for different sectors of industry. This will provide a long support and delivery guarantee, should a fault occur times. Then come on the boards modern CPUs, such as Intel's Core i-series are used. However, retail prices are very high, and the ratio of costs and benefits should be checked right here. If you have interest in such a model, you can of course send us a request.
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