I want to buy an Apple Extended Keyboard to use with my MacBook Pro. Naturally, this means that I must purchase an ADB to USB adapter. However, no manufacturer seems to make these anymore, and the scarce units on eBay are incredibly expensive. So I discovered that ADB is simply Apple's version of Mini-DIN, and found Mini-DIN to USB adapters for significantly cheaper. So my question is: can I use a generic 4-pin Mini-DIN to USB adapter for use with my Mac, or must I opt for the more expensive ADB to USB?