What's your specialty?

While I have a lot of different stuff, I consider myself primarily a collector of S-100 systems and other early systems before about 1981. Early systems include the Altair, Imsai, Vector 1 - 4, Heath, Northstar Horizon and Advantage, and custom boxes built for industrial use. And more for completeness than any other good reason, I have the Apple II+, IIC, IIc+, IIe, IIe Enhanced, most of the early Macs, most of the early Commodore pet series, and most of the early TRS computers. And perhaps just as important, I collect documentation. Docs I've collected range technical documentation. Probably the rarest thing I have is a Business Plan for Polymorphic Systems that was created when Polymorphic changed hands in about 1979 (can't remember the exact year.) I don't collect the big iron although I have quite a few progamming and system docs for both IBM and Burroughs. The only Dec stuff I have are the PDP-8l, 11/05, 11/04?, LA36s, some of the old M Series logic boards, and a number of the disk cartridges. Then there are the arcade games, radio stuff, old oscilloscopes, printers, monitors, calculators, and other such stuff. To the best of my knowledge, most of the systems work, or at least worked when I acquired them.