My first computer was a 30 baud TTY modem connection to a UNIVAC 1106 (1864) (I was a member of an early on line tutorial experiment) The main frame could have been an earlier model, I was 8 at the time. The first "Personal" computer was a Titan III missile section that our collage received surplus and that we rewrote the operating system from the ground up.
Regards,
Kevin