[6] The Iyonix originated as a secret project by Pace engineers in connection with development of set-top boxes (STBs),[citation needed] and has been noted as a successor to the RiscPC.

The sources and hardware design were subsequently acquired by Castle, who developed them into the final product.

Sales continued for another two years via a newly established company, Iyonix Ltd, which enabled Castle itself to circumvent the regulations.

[8] On 25 September 2008, Castle announced that production of the Iyonix had ceased and that new units would no longer be available to order.

All interim machines had been built on the ARM7500 system on a chip, which was widely regarded as a single-chip Risc PC.