default or selected kernelversion does not have config value CONFIG_COPS.
Result is shown for kernelversion 6.9.9

COPS LocalTalk PC support

modulename: cops.ko

configname: CONFIG_COPS

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>COPS LocalTalk PC support
In linux kernel since version 2.6.12  
This allows you to use COPS AppleTalk cards to connect to LocalTalk
networks. You also need version 1.3.3 or later of the netatalk
package. This driver is experimental, which means that it may not
work. This driver will only work if you choose "AppleTalk DDP"
networking support, above.
Please read the file
<file:Documentation/networking/device_drivers/appletalk/cops.rst>.

source code: