The original notes for the original version from Rich Mellor which are included with TurboFix 2 state:
But refer to Minerva MultiBasic only (probably written before SBASIC came about).BASIC_NAME$, BASIC_INDEX%, BASIC_TYPE%, BASIC_F, BASIC_L, BASIC_W% and
BASIC_B%
All of these will now either access SuperBasic's variables or those of a
MultiBasic (see above).
The Turbo Fix 2 notes in the same package refer to another version modified by Simon Goodwin.
The notes from Davide Santachiara (Ergon Development) with TurboFix 2 state that:
And looking in the extensions file, it includes BASIC_INDEX% too.A new version of TURBOFIX has been prepared. This allows to use
the following Turbo Toolkit keywords on Minerva MultiBasic or
SMSQ S-BASIC:
BASIC_POINTER / BASIC_B% / BASIC_W% / BASIC_F / BASIC_L / BASIC_NAME$
The previous version of Turbofix worked on Minerva but not on SMSQ.
This release is OK on both o/s.
Without the sources, we probably can't tell other than just trying it. If you have already tried the turbofix and it didn't work for you, the next step is probably to try to ask Davide if he can look at this if he still has the sources.
For anyone sufficiently familiar with the internal workings of SBASIC and Turbo, the Turbo Toolkit sources are available.