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Intersil initially provided a Linux driver for the first Prism54 chips which implemented a large part of the 802.11 stack in the firmware. However, further cost reductions caused a new, lighter firmware to be designed and the amount of on-chip memory to shrink, making it impossible to run the older
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version of the firmware on the latest chips. In the meantime, the PRISM business was sold to
Conexant, which never published information about the newer firmware API that would enable a Linux driver to be written.
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The chipset has undergone a major redesign for 802.11g compatibility and cost reduction, and newer "Prism54" chipsets are not compatible with their predecessors.
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Wireless adaptors which use the Prism chipset are known for compatibility, and are preferred for specialist applications such as packet capture.
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However, a reverse engineering effort eventually made it possible to use the new Prism54 chipsets under the Linux and BSD operating systems.
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for the ISL38xx-based Prism chipsets (mostly reverse engineered)
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150:Legacy 802.11b products (Prism 2/2.5/3)
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130:brand is used for wireless networking
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104:August 2012
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192:WPA2 (
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