Developer : Digital Eclipse Genre : Game Collection Contains Robotron: 2084 (1996) Achievements : retroachievements.org
not completed.
Image source: mobygames.com
Analysis
I was trying out the Genesis version and was struck by how accurate the sound is in Defender. I was wondering if it was a real-time emulation. According to this gamedeveloper.com article, Digitial Eclipse generally fully emulate the hardware on PC, including the audio hardware. But to save resources on older platforms, they would record all sounds from the emulated hardware, along with the commands that triggered them. Then they would end up with a palette of accurate sounds that can be played back by any hardware capable of sample playback.