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6.5.5. Software Setup
PCI supports the Plug-and-Play standard developed in 1992 by hardware vendors. There will be, in general, no jumpers or DIP switches on PCI boards. To set up a PCI board, you just run the PCI Configuration Program. Reconfiguring a system can be done without popping the top on the computer, a great convenience to users and support people.
6.6. PC Card (PCMCIA): The Portable Bus
This bus standard is used for laptop computers. As the laptop computers take very little volume so it is difficult to use the large expansion cards in laptop computers. This is why PC card or PCMCIA standard was designed.
Let's compare PC Card to the other buses that we've discussed:
Memory address space: PC Card supports a 64MB addressing ability. This will be adequate for current machines, but will look sparse in a few years, as more demanding operating systems like OS/2 and NT become more popular.
Bus Mastering: PC Card does not support bus mastering or DMA.
Plug-and-play setup: PC Card allows and also requires that hardware setups be done with software. Because of the physical size of a PC Card, you'll never see jumpers or DIP switches.
Number of PCMCIA slots possible in a single system: Most of the other buses support no more than 16 slots. The PC Card standard can, theoretically, support 4080 PC Card slots on a PC.
Data path: The data path for PC Card is only 16 bits, a real shame but one that will probably be fixed in the next version of the standard.
Speed: Like other modern bus standards, PC Card is not limited to 33 MHz clock rate. It may go up to 150 MHz.
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