| J. Blackford | No tapes | No tapes | No books | No hardware |
| J. G. Prince | Tapes | Tapes sorted by code | No books | No hardware |
| J. K. Greye | Tapes | Tapes sorted by code | No books | No hardware |
| J. P. Gibbons | Tapes | No tapes | No books | No hardware |
| J. Purves | No tapes | No tapes | No books | No hardware |
| JRS Software | Tapes | No tapes | No books | Hardware |
| J. W. M. Wright | No tapes | No tapes | No books | No hardware |
| Jackett Software | No tapes | No tapes | No books | No hardware |