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You could pick up a single-slice Acorn RiscPC with Ethernet from Ebay for around 150 GBP, install 2 HDDs (there are three internal spaces so you can choose between CD or floppy) and install ArmLinux.

OP is in the US, where getting a RiscPC would be somewhat harder. And for that sort of money you could buy vintage Sun kit and run SparcLinux on considerably more reliable hardware.

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Make sure you get one with Ethernet as the Ethernet module was not a standard item and are now hard to source (and for £50-£100, rather expensive).

Ah, but think of all the hard work that went into the RiscOS drivers for those Ethernet modules! (Well, ANT EtherM and Ether3 at least.)

Peter