The Costa GUI, version 2.0
By Jacob Palm

Changelog
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Costa 2.0 is a major release of Costa, although it might not look like it.
All of Costa has converted to or rewritten in Turbo Pascal, removing the need
for a run-time BASIC module. Some parts have been rewritten in Assembly, to
ensure low memory needs and high performance in parts of the program where it
really matters.
 -Heavy optimizations - Costa now only takes up around half the amount of
  disk space than version 1.8.0, and runs faster.
 -New launcher, COSTA.COM. Optimized to use only 1.3 kilobytes memory when
  running, ensuring your programs and games have as much memory available as
  possible.
 -Messagebox buttons now show their action instead of just Yes/No - for
  example, if exiting the icon editor with an unsaved icon loaded, it will
  ask you to "Save" or "Discard". This makes the outcome of choices easier to
  interpret.

For older versions, see the complete changelog at https://costa.jacobpalm.dk