TDI Software Limited
TDI Software Limited were based in Bristol and produced programs for writing p-system code for the QL.
On the QL they released:
- Advanced Development Toolkit - a full set of productivity tools
- UCSD Fortran77 - compatible with the standard Fortran-77 implementation
- UCSD Pascal - compatible with UCSD Pascal developed for a range of machines by the Regents of the University of California.