Psion Series 3a

Boots the authentic Psion Series 3a EPOC16 (SIBO) v3.40F system ROM on a NEC V30 core built from PCjs's x86 executor, all the way to the System screen — the EPOC16 desktop with the System, Data, Word, Agenda, Time, World, Calc and Sheet apps. Power-on runs the self-test (the POST progress port steps 0x10 ROM → 0x20 RAM → 0xF0 done), starts the EPOC16 kernel, window server and file server, and formats a clean internal RAM disk, then paints the desktop. Move the selection between apps with the arrow keys. Open the debugger to single-step the V30 one true instruction at a time, read and write the full register file, disassemble and inspect memory through the ASIC9 pager, and set execution breakpoints and write watchpoints. Type on the on-screen Psion keyboard or your physical keyboard (the app hot-keys System/Data/Word/Agenda/Time/World/Calc, the ◆ Diamond, Menu and Psion keys are all wired to the ASIC9 keyboard column-scan).