Acorn RISC OS

Boots an Acorn Archimedes A3000 (Acorn ARM2) running RISC OS 3.11 straight to the desktop. Move the mouse over the canvas to drive the RISC OS pointer and click the icon-bar icons; type on the physical keyboard or the on-screen Archimedes keyboard. Add ?debug, or click Debug, to inspect the live ARM2 registers (r0-r15 with the PC+PSR word), read memory, disassemble ARMv2 code, single-step one instruction at a time, and set execution breakpoints and write watchpoints - all served by Arculator's own core through the hooks we compiled in.