default or selected kernelversion does not have config value CONFIG_ELPLUS.
Result is shown for kernelversion 6.2.5

3c505 "EtherLink Plus" support

modulename: 3c505.ko

configname: CONFIG_ELPLUS

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet (10 or 100Mbit)
└─>3c505 "EtherLink Plus" support
In linux kernel since version 2.6.12  
Information about this network (Ethernet) card can be found in
Documentation/networking/3c505.txt. If you have a card of
this type, say Y and read the Ethernet-HOWTO, available from
<http://www.tldp.org/docs.html#howto>.

To compile this driver as a module, choose M here. The module
will be called 3c505.

source code: