A series of StrongARM based computers, running RiscOS. Very popular with some scools as they were the successor to BBC model B micros in a lot of classrooms before the rise of the PC.
2 pages link to Acorn:
lib/main.php:944: Notice: PageInfo: Cannot find action page
lib/main.php:839: Notice: PageInfo: Unknown action
lib/blame.php:177: Warning: Invalid argument supplied for foreach()