Diane Duane's Young Wizards series is more "magic as programming" but it's also quite good if you like stuff that's fairly YA pitched. It bridges the gap between "magic is deeply mysterious and unknowable" and "with the right set of words and invocations you can teleport" in an unusually deft way. Magic uses a more declarative language than an imperative one, but it's composed in much the same way as you might compose a program.

A magic Apple II makes an appearance, if I'm remembering correctly...