There is also an interesting 6-pages interview with Larry DeMar of Defender, Stargate, Robotron, Blaster, The Addams Family flipper - the most succesful flipper table of all time - fame).
In this interview you can read that Blaster, Robotron's sequel, was first programmed for Atari 400/800 (to be ready for the upcoming 5200 launch).
Williams asked a coin-op version and to hold off the home version.
As you can read on AtariProtos,
After the arcade game came out and met with modest success, Vid Kidz (Eugene Jarvis & Larry DeMar's firm) went to Atari with their prototypes to work out a deal. Unfortunately by this time it was 1984 and the video game market was crashing fast. Although Vid Kidz finally worked out a deal, Atari decided not to release the game due the weak market.
According to Retro Gamer, Larry DeMar helped get the unreleased home version into public domain in 2004.
Blaster arcade came out in 1983, so Blaster for A8 was ready in 1983!