...
However some useful Z88 software does not function on the newer OZ versions, since these authors deviated were known to deviate from the Cambridge developer guidelines. SpellMaster, and Vision2 VT100 terminal are two is one such applicationsapplication. Using a Z88 as a portable serial terminal, with its full size keyboard, remains a useful proposition even today.
...
There is over 256KB remaining on the file area - just enough to accommodate SpellMaster. It needs some disassembly to locate and patch its bank switching code.