… I remember now, it was a late-1996 issue (but possibly a UK edition!) to match this puzzle:
Acorn RISC Technologies
At the centre of the new developments is ART, whose introduction of the superfast new StrongARM card has provided the computing power to drive many of the new applications. ART will be demonstrating the new processor in Rise PCs on the stand and will be presenting StrongARM upgrades as competition prizes every half hour throughout the show.
A complete SA-equipped Risc PC will be presented to the winner of a ‘Lucky Key’ competition run in conjunction with Byte magazine, and show sponsor Acorn User will have StrongARM upgrades among the many lucky dip prizes. For those not lucky enough to win one, StrongARM will be on sale to the public for the very first time from the Centres of Technology exhibiting at the show.
(from “Acorn User 1996 Magazine”)
Anyhow, found this article instead: