What are the old Genie garage door opener models?

Old Genie garage door opener models include many generations from 1960s to 2000s, with model names like Genie Screw Drive, Chain Drive, and Intellicode series. Early Genie models from 1960s to 1980s include Genie Screw Drive models like Genie Screw Drive 400, 450, 500, which used screw mechanism. From 1980s to 1990s, Genie models included Genie Medallion, Genie Professional Line, Genie Excelerator with faster opening, Genie ChainLift and BeltLift early versions, and Genie Intellicode models starting in 1995 with rolling code security. Old Genie models with DIP switches include Genie models with 8 to 12 DIP switches for code setting, used before rolling code. Specific old model numbers include Genie GCG-350, Genie GSTB-BX, Genie GT-912, Genie CM7600, Genie CM8600, Genie Pro Max, Genie Pro Stealth, Genie PowerLift, Genie SilentMax early versions like SilentMax 1000. Old Genie openers often had Learn button that was green, red, or black. Many old Genie models are discontinued but parts may still be available. Old Genie screw drive models are known for noisy operation but durability. If you have old Genie opener, model number is on label on motor unit. For replacement, modern Genie models like SilentMax 1200 and ChainLift 1022 are current equivalents with improved safety and smart features.