The NSLU2 is a network-attached storage (NAS) device made by Linksys introduced in 2004 and discontinued in 2008. It makes USB flash memory and hard disks accessible over a network using the SMB protocol. It was superseded mainly by the NAS200 and in another sense by the WRT600N and WRT300N/350N which both combine a Wi-Fi router with a storage link.
An NSLU2
NSLU2 Side View
NSLU2 Mainboard/PCB
XScale is a microarchitecture for central processing units initially designed by Intel implementing the ARM architecture instruction set. XScale comprises several distinct families: IXP, IXC, IOP, PXA and CE, with some later models designed as system-on-a-chip (SoC). Intel sold the PXA family to Marvell Technology Group in June 2006. Marvell then extended the brand to include processors with other microarchitectures, like Arm's Cortex.
Intel PXA255
Intel PXA270 with 624 MHz
Toradex Colibri XScale Monahans PXA290 SODIMM-module (Prototype Of Marvell PXA320 SODIMM-module)
PXA168 System On Module by tianyeit.com