Note for everyone: There is full serial console support in Windows Server...
Just hook up your VT100s and Teletypes and have at it. :-D
Powershell also supported.
https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/bootcfg-ems
https://docs.microsoft.com/en-us/windows-hardware/drivers/devtest/boot-parameters-to-enable-ems-redirection
VMs also
https://docs.microsoft.com/en-us/azure/virtual-machines/troubleshooting/serial-console-windows
(For the TTYs you may have to use a baud rate converter. Although I haven't tried, I suspect that neither the line driver nor the hardware will go low enough for a TTY.)