Just received my Altair Clone (magnificent indeed).
I've set it up for a terminal (wyse 150) on 2SIO Port 1 and Disk Transfer on 2SIO Port 2.
I've added a dual rs232 port module to a raspberry pi. With the short connection, I can set it for 460.8k/sec speed and get disk transfers completed in < 14 seconds.
I have not done it yet because I prefer my Wyse Terminal, but one could configure rs232 port 2 on the PI to go to 2SIO Port 1 and then terminal in from the PI. You could configure a script to know to send rom files and other port 1 files automatically over 2SIO Port 1 and dsk files over port 2.
It removes the need to have a PC to send .dsk files.
moveit.sh script:
stty -F /dev/ttySC0 460800 cs8 -parenb -cstopb -ixon
sx $1 < /dev/ttySC0 > /dev/ttySC0
pi@s100:~/diskfiles/basic/Floppy Disk $ ./moveit.sh GamesOn300-5-f.dsk
Sending GamesOn300-5-f.dsk, 2638 blocks: Give your local XMODEM receive command now.
Bytes Sent: 337664 BPS:26450
Transfer complete