This adapter is almost as expensive as the Keyspan, so you may want something with better vendor support. This driver has had issues in the past but recently some people have reported success with it. Although Belkin doesn't provide a Mac OS X driver for this adapter, an open source Belkin F5U103 USB-serial adapter Mac driver is available. The Belkin F5U103 is a versatile USB-serial adapter with both a DB9 male and a Minidin-8 female port. Driver for Keyspan USA Serial Adapters (Mac OS X 10.2.8 - 10.5.x).Driver for Keyspan USA Serial Adapters (Mac OS X 10.6.x - 10.8.x).Tripplite has posted drivers for all the Keyspan Serial adapters at these links: However reports seem to indicate that it doesn't supply power to the tablet, so you should only use this adapter with externally-powered tablets. My only caveat is that it's very expensive! For PC-style Wacoms that come with a fat DB9 cable, the Keyspan USA-19HS (~$25-35) works well. I use this adapter for development, and it works very well with Wacom tablets. The Keyspan USA-28XG ($60-85) has two female Minidin-8 ports. Keyspan (now Tripplite) makes the best-supported USB to serial adapter for Mac OS X. Serial model Wacom tablets come with one of two connectors: Should you get a Serial or 'PDA' adapter, an RS232 or 242, or a DB10 or DB9 plug.? And what about low price generic adapters? This page should help clear up any confusion you might have regarding adapters.

Finding the right adapter for your particular tablet can be a challenge.

Mac usb serial driver