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+exerciser:
+https://mirrors.apple2.org.za/apple2.caltech.edu/8bit/patches/smartport.shk
+
+some notes:
+https://groups.google.com/forum/#!searchin/comp.sys.apple2.programmer/SmartPort$20low-level$20details$3F/comp.sys.apple2.programmer/1b00segju_c/B6d3C6T6-SoJ