Software maintenance issues

Operating system changes that affect language functionality.
     example:  changes to Windows affecting qBasic functionality,
                     switch from qBasic to QB64
                     changes to MAC OS X affecting chipmunk Basic functioning
Language changes that affect program functioning.
     example: C++ library changes affecting Asa H functioning
                    C++ on Linux versus MSWindows
Functionality affected by program growth.
     example: Prolog crashing sooner as knowledge base is grown
Adding external disk and/or CD drives to enable continued use of old media.
Backups guarding against media failures.
Porting AsaH to the new tablet computers (and their operating systems).