If you look here https://www.fanucamerica.com/docs/default-source/cnc-files/brochures/function-catalog.pdf Or if it doesn't open for you - Web search "fanuc cnc functions communication software" then look at the Fanuc Brochure. Then search the 2023 Brochure for "memory" and read 098, 099, 558, 564, 774, and these tell you the latest options available for the latest controls. It looks like, for the F model, you have a 2MB maximum limit. If memory serves me, the available function is a Fanuc card that stays inserted into the PCMCIA slot with Fanuc installed software, and the control reads and processes it as "internal" memory. The best thing to do, is collate a list of your machines and control numbers, and email Fanuc explaining what you want to do, and asking what exactly you need. It seems you'll need a service visit to configure the machines to a network/DNC and at the same time they could install the extended memory and supply training for everything.

Personally, I'm an Okuma guy. We bought an Okuma MU1000H in 2013 and have run it hard 24 hours a day 6 days a week for a decade. It has been such a good machine we bought a 2nd one in 2023. With a 170 station tool magazine and a 2 station pallet setup they are consistently the most productive machines in the plant. A 6 station pallet changer is available for these, but that would take up too much space for us. We struggled to find room for the 2nd machine. They build vertical trunnion machines as well from 4000mm tables to 8000mm. Okuma 5 axis machines