S-100 with CP/M -- 64 Meg of memory, dual 8" floppies. Wordstar and Visicalc and BASIC.
Only $10,000. And I had to write all my own accounting software.
A "Married with Children" classic moment.
http://www.youtube.com/watch?v=jJ19lhZf6mE&mode=related&search=
My brother had an IBM-clone PC in 1983 that he hooked up to his B&W TV. Everything was written in code by him and that was what he considered fun. It was so annoying getting to the point where you could make a picture of a man using 0s and 1s that I swore off computers until 1991.