Since I will update my HEQ-5 mount to GoTo-option, I need a RS232 -serial connection to laptop. I have a already a USB-to-serial converter, but it only has a one serial port. So I have ordered DeLock PCMCIA -adapter card, providing 4 COM-ports. This would allow to connect a mount itself and two focusers -> one port would be still free.
Installation was pretty straightforward: plug in the card, select manually suitable drivers for win XP and final testing of card. To control panel, four COM -ports were added: