ISA bus support on modern systems

configname: CONFIG_ISA_BUS

Linux Kernel Configuration
└─>Bus options (PCI etc.)
└─>ISA bus support on modern systems
In linux kernel since version 4.1 (release Date: 2015-06-21)  
Expose ISA bus device drivers and options available for selection and
configuration. Enable this option if your target machine has an ISA
bus. ISA is an older system, displaced by PCI and newer bus
architectures -- if your target machine is modern, it probably does
not have an ISA bus.

If unsure, say N.

is selected by
CONFIG_CIO_DAC