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It would be better to restore the previous screen contents,
but that's probably not trivial to implement.
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dynamically
* The clrtobot capability (cd) is only used after goto(1,1), so it's safe to
clear the entire screen.
* Consistently use ESC[0m to disable attributes.
AFAIK, it's not possible to disable individual attributes only.
* al, AL, dl, DL, ic and dc are actually available, but only under NANSI.SYS.
We now detect recent versions of NANSI.SYS dynamically and enable these extensions,
which will speed up screen scrolling.
* Scrolling is now fixed under Dosbox.
Obviously they don't support the NANSI.SYS extensions.
* You can still define %TERMCAP% even on DOS to load a customized termcap definitions
file.
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This is done via 10h interrupts and special memory regions.
The alternative would have been to use set the cursor to 9999,9999
and query the cursor position via ANSI escape sequences.
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It can be cross-compiled or compiled natively on 32-bit DOS
with OpenWatcom C v1.9.
Compiling on an 8086 might be possible later on - but we would
have to add support for some ancient ANSI C compiler.
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* adapted Doxygen config file
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to Doxygen format and cleaned up manually
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