Leopard supports both PowerPC - and Intel x86 -based Macintosh computers support for the G3 processor was dropped and the G4 processor required a minimum clock rate of 867 MHz, and at least 512 MB of RAM to be installed. Apple called it 'the largest update of Mac OS X'. This is really no different than the way Windows drivers work. Mac OS X Leopard was released on October 26, 2007. Of course the peripheral device maker has to work within the integration model the OS maker provides, including security requirements like driver signing. Apple obviously provides kernel level support for IO port access, and sometimes a generic kernel driver, and they did provide a the Rosetta 2 shim when things change at the kernel level, but the ball seems to be mostly in the court of the peripheral makers. Go to the Apple Menu at the top left of your screen, then choose System Preferences. This experience tells me that the peripheral makers are largely responsible for providing support for their devices on Apple platforms. Some time later, quite recently in fact, Logitech released a native version driver that works as-expected for a subset of their devices, with support for more devices coming soon.
Upgrading from an older version of macOS If you’re running High Sierra (10.13), Sierra (10.12) or El Capitan (10.11), upgrade to macOS Catalina from the App Store. Click Upgrade Now and follow the onscreen instructions to begin your upgrade. But the Rosetta 2 “shim” method never worked quite right so Logitech discouraged users from using it. Go to Software Update in System Preferences to find the macOS Catalina upgrade. It looked like support for Logitech Options (for configuring keyboard and mouse options) would follow a similar path. The scanner maker eventually released a native driver for Apple Silicon which I download from the scanner manufacturer, which worked even better. When I upgraded my wife to the latest M1 iMac her scanner only worked with Rosetta 2 support.
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