The Coleco ADAM Sound Enhancer plugs into the Expansion Port on the ADAM computer. This revised board now comes with a case and a 3.5mm line out jack and allows the standalone Coleco ADAM to play most SGM (Super Game Module) cartridges. It contains an AY-3-8910 programmable sound generator chip and 74 series logic chips.
This board works out of the box with RF (TV) output. If you are using the AUX VIDEO port (composite video) then you have two options for hearing audio from the ADAM Sound Enhancer:
- The newly added 3.5mm line-out jack can be hooked up to external powered speakers or stereo system. The single line-out from the sound enhancer is connected to both the left and right channels of the stereo 3.5mm jack.
- The ADAM can be modified to fix a design flaw that causes audio from the expansion port to be low/quiet. The modification requires moving a soldered wire and optionally adding a capacitor. More information is available in this Service Bulletin (PDF).
NOTE: The board was tested with the expansion ADAM for Colecovision and it produces an echoing sound when a SGM game is not being played. This echoing noise is also heard on the standalone ADAM only when using Hard Drive.
Some more information about the original board is available in this AtariAge thread. The original board was designed by chart45 and the original PCB can be found at https://www.pcbway.com/project/shareproject/ColecoVision_Adam_sound_chip_Ay_3_8910_030010b9.html The 3D printed case for the new ADAM Sound Enhancer will not fit the original board design.