Looking around the source you’ll find numerous references to Acorn’s internal project codenames. Some are given here, with approximate release dates (or development dates if they were never released). Those in need of confirmation are marked with question marks.
Avon | A3000 | 1989 |
Perth | A4 | 1992 |
Brisbane | A5000 | 1991 |
Fox | A540 | 1990 |
Adelaide | A3010 with mezzanine board | 1992 |
Heron ‘C’ | A3010 with ARM250 | 1992 |
Heron ‘E’ | A3020 | 1992 |
Roadrunner | A4000 | 1992 |
Medusa | Risc PC | 1994 |
Aquarius | C/C++ programming environment | 1995 |
Project Black | RISC OS 3.60 | 1995-6 |
Phileas, Customer | The first generation of the Acorn web browser, Bookworm | ? |
Phoenix | The second genration of the Acorn web browser, Browse | 1996-8 |
Phoebe | Risc PC Mk II | 1998 |
Ursula | RISC OS 3.8 | 1997-8 |
Rachel | StrongARM processor card | 1996? |
Chandler | IOMD2 | 1997-8 |
Monica | PCI bridge | 1997-8 |
Galileo | The next generation operating system that never was | 1997-9 |
Tungsten | Post-Ursula STB work? | ? |
Blue | RISC OS 3.5? | 1992 |
Buffy | RISC OS 4? | 1999 |
Mostly based on Matthew Hambley’s page , with additions.