It was a small embedded Linux ARM computer without a display which can be considered an early predecessor to the subsequent Raspberry Pi.
As one of the first such computers on the market, the device has a 1.2 GHz Marvell Kirkwood 6281 ARM-compatible CPU, a.k.a.
The following commercial products are known to be based on the SheevaPlug platform: A version with an eSATA port for connecting a serial ATA hard disk is also available and sometimes referred to as SheevaPlug+.
Revision 1.3 of the SheevaPlug can be extended by one ESATA port, but soldering is required and will void the warranty.
This debug console can be accessed from any computer with support for the FTDI bus translator (FreeBSD, Linux, Mac OS X, Windows).