ST4 was the name given to a box marketed by SBIG in or around 1990. It automated some guiding processes.
These days, the box has been replaced by electronics inside guide cameras which do the same thing.
If you've a choice, go with direct mount-computer connection. The main advantage for us being that you calibrate once and re-use that same calibration; no need for aux-mounts or extra cables.
Cheers and HTH
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