[fpc-pascal] Can We use CRT and Video Unit in Single Unit In free pascal

[DaWorm]

Or you can do the right thing and not use the contents of the video memory
as if it were a variable to be used to check if you have or have not done a
particular thing, which is what it looks like your original code does.

This would require understanding more of what the program you are porting
was intended to do and less of how it did it.  Once you have that, so many
questions answer themselves.

Jeff.
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