The Fastlane above, while an excellent interface offering 3 MIDI outs, one in and a printer/modem port passthrough, is pretty overpriced. There are simple one in one out interfaces available which are pretty cheap. A Google or ebay search for macintosh midi -usb that's minus usb should find you what you want. The 1x1 interfaces are pretty easy to find, and to build.

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Hell, I remember when I bought my miniMacMan new from Guitar Center years ago....that was about 80 bucks or so and it was only one port in and out. This is a bargain IMO for a brand new device for older serial-based Macs (at least what I could find so far with serial ports for the Mac). Remember that USB's commoditization brought down the price of USB devices down a lot.

BTW, great tip on the search procedures....I wasn't aware of that.

One thing to consider with the single in/out MIDI interfaces is that if you daisy-chain too many of them you'll eventually experience a MIDI delay. This is why you want to use interfaces with more than one set of ports.