Auto-detect Token Ring driver. This extension allows your PCI based computer to connect to a token ring network. Install this extension if you wish to use the automatic ring speed detect feature. Requires PCI-based Power Macintosh system except Power Macintosh 7200/75 and 7200/90 systems, MacOS version 7.5.3 or higher, Open Transport 1.1 or higher (OT 1.1.2 or later strongly recommended), and an Apple PCI Token Ring card. Unnecessary if you are using a NuBus-based computer. These drivers (Apple PCI Token Ring, Apple PCI Token Ring(16MB) and Apple PCI Token Ring(4MB)) are mutually exclusive, and only one of these should be installed in the system for proper operation.