catalina with the mountain lion partition

i have a spare MacBook air that runs both Mountain Lion and Snow leopard on 2 separate hard drives

the way i can scan, print and use 2012 data that does not need today's standards

i built this spare from a discarded mother board i happen to find in 2013 and found the needed parts on ebay this summer.

the coast was under 75$ and i use a HDMI to display port for a screen on my TV.

 users are selling their older MacBook for lesser prices every upgrade, i would check to see if you can find a deal on a 2010 MacBook for your mountain lion needs

i hope this was advice was helpful and encouraging

No. It's too old to boot that Mac model.

(185226)

No matter what worked on a 2012 or 2013 Mac, a 2017 Mac cannot boot with Mountain Lion or any other OS older than what the Mac came with.