I have an iPad 4 that's mostly used for email and reading HN/blogs in bed. My daily Linux machine is a Thinkpad T430 from 2012. I daily drive a 1993 Saab 9000

I have an iPad 4 that's mostly used for email and reading HN/blogs in bed. My daily Linux machine is a Thinkpad T430 from 2012. I daily drive a 1993 Saab 9000 -- Can it run custom software? The electronics (HVAC, lights, wipers, etc.) are controlled by a Raspberry Pi, so kind of? And some old phones lying around, including a working Razr and a Palm Treo that can still sync with Windows 10(!)