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This is a modified conio. It doesn't draw a cursor at all.
+
+More particularly, the standard cc65 conio always draws a cursor, whether
+the cursor is enabled or not. When it's disabled, the cursor is drawn
+as a space character.
+
+Benefits of doing this:
+
+- Faster and smoother screen updates
+- Slightly smaller code (20-30 bytes)
+- No more "cursor ghosts" at timed prompts
+- No need for a hide_cursor() function
+
+Disadvantage: Have to draw the cursor myself when needed. It turns out
+that only agetc() needs to do this, so not a big deal. Also had to
+add an agetc_no_cursor() for timed_getch() to use.