Maintaining old hardware to 2026 security requirements is damn near impossible, and what constitutes "old" is very variable; HOWEVER putting them behind a dedicated VLAN+firewall+VPN is not that hard.
I've helped do it for industrial equipment (win95 controller or something) that couldn't be upgraded without spending millions, but it sill required pulling out the old 10base2 network and installing cat 6 cables in a factory floor and new switches.
I've helped do it for industrial equipment (win95 controller or something) that couldn't be upgraded without spending millions, but it sill required pulling out the old 10base2 network and installing cat 6 cables in a factory floor and new switches.