Another Space Invaders clone for text mode

Another kewl Space Invaders clone for text mode.
This program is (not) under development.
It started out as a toy when my friend was here playing with QuickBasic...

si have been written by Joel Yliluoma, a.k.a. Bisqwit,
and is distributed under the following terms:

* No warranty. You are free to modify this source and to
* distribute the modified sources, as long as you keep the
* existing copyright messages intact and as long as you
* remember to add your own copyright markings.
* You are not allowed to distribute the program or modified versions
* of the program without including the source code (or a reference to
* the publicly available source) and this notice with it.

The official home page of si is at http://oktober.stc.cx/source/si.html.
Check there for new versions.