This is one of two known Blaster prototypes for the
Atari 8-Bit computers. The only difference between
the two is the company credited on the title screen.
This prototype (which was compiled from code rather than
dumped from a physical prototype) has an Atari copyright
similar to the 5200 prototype while the other version has
a Williams Electronics copyright. It is assumed that
had this been released Atari would have used this version.