Gday Logan
If you already have a serial port, you can use that with the correct ASCOM driver to allow full mount control, incl pulseguiding.
I cant remember ever seeing a true COMPort/rs232 to ST4 adapter,
but there are some parallel port to ST4 cables if you have an LPT port
( my lappie has one :-) )
These allow ST4 guiding via the LPT port and leave the com port free.
Andrew
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