I have just purchased a Garmin GPS which according to the insructions can only be connected to a PC via a Serial Port. I have three PC's a Shuttle desktop, a Dell Laptop and a Dell Notebook..
None of them has a Seial port. Is there any thing I can buy to solve this problem?
However, in my experience USB to serial adaptors rarely work well. We use a lot of them at my work and I've found proper bi-directional support to be flaky at best, even though they state they support it (some work, a lot more don't)
as you have a desktop get a PCI serial card for better reliability