| Philip Harwood | Tapes | Tapes sorted by code | No books | No hardware |
| P. L. Donovan | No tapes | No tapes | No books | No hardware |
| Precision Software Engineering | No tapes | No tapes | No books | No hardware |
| P. S. I. | No tapes | No tapes | Books | No hardware |
| PSS | Tapes | Tapes sorted by code | No books | No hardware |
| Panther Books | No tapes | No tapes | Books | No hardware |
| Paul Shreeve Software | No tapes | No tapes | No books | No hardware |
| Peter Evans | No tapes | No tapes | No books | No hardware |
| Peter Furlong Products | No tapes | No tapes | No books | No hardware |
| Philip Joy | No tapes | No tapes | No books | No hardware |
| Phipps Associates | Tapes | Tapes sorted by code | Books | No hardware |
| Phoenix Marketing | No tapes | No tapes | No books | No hardware |
| Picturesque | No tapes | No tapes | No books | No hardware |
| Pixel Productions | Tapes | No tapes | No books | No hardware |
| Pleasantrees | Tapes | No tapes | No books | No hardware |
| Pluto | Tapes | No tapes | No books | No hardware |
| Poolsoft | No tapes | No tapes | No books | No hardware |
| Practical Wireless | Tapes | No tapes | No books | No hardware |
| Pretorius Systems | No tapes | No tapes | No books | No hardware |
| Print 'n' Plotter Products | No tapes | No tapes | Books | No hardware |
| Prolog Home Software | No tapes | No tapes | No books | No hardware |
| Protek | Tapes | Tapes sorted by code | No books | No hardware |
| Psion | Tapes | No tapes | No books | No hardware |