Our Atari world is buzzing with news of Matthieu Isorez supplying his own copy of Alien Blast!! Previous public releases crashed on level 3 due to data corruption and we've been after the original disks/files ever since. Finally, we have them and can play the later levels - which is exactly how I plan to spend the rest of my Sunday :-)
Thanks to Marko Latvanen @AtariMania for the heads-up. Today is a great day!!