diff --git a/sbf-cpp/NOTES.md b/sbf-cpp/NOTES.md
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--- /dev/null
+++ b/sbf-cpp/NOTES.md
@@ -0,0 +1,8 @@
+https://www.fileformat.info/info/unicode/char/2551/index.htm
+http://melvilletheatre.com/articles/ncurses-extended-characters/index.html
+https://superjamie.github.io/2022/08/06/ncursesw
+https://pdcurses.org/
+https://invisible-island.net/ncurses/announce-5.8.html
+https://www.mail-archive.com/pdcurses-l@lightlink.com/msg00129.html
+https://www.projectpluto.com/win32a.htm
+https://github.com/Bill-Gray/PDCursesMod