A relatively new iPhone app called iBASIC from AkeySoft Group brings several old Apple II games to the iPhone. Included are eight EAMON adventures, Life, Lemonade Stand, Hamurabi, and StarTrek. These are all text based games written in BASIC from the late 1970s to early 1980s.
The latest version 1.1 adds “the Apple DOS 3.3 command handler for BASIC programs, so that adventure games like EAMON can use DOS commands to access files like maps and other elements.” iBASIC is $1.99; there’s also a free version called iBASIC Lite.