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1). Try JustBASIC. It is a free download, and they have an active message forum. It puts me in mind of what QuickBASIC would have become in a Windows world.
2). It'll cost a bit, but investigate the Parallax BASIC Stamp. There are arguably better implementations of the concept, but not as widespread or popular, and it will fit the bill both for learning a BASIC dialect, and getting close to the metal. You can pick up a starter kit at Radio-Shack (#276-625) for eighty bucks.