How about a KIM-1. A Single Board computer with a 6502 processor, 2K ROM, 1K Ram (expandable to all of 4K), a 24 key keypad, and a 2 character single line display. This was in 1978 or so. All assembly language, It could be connected to an ASR-33/KSR-38 Teletype (anyone remember those?). Still have the KIM-1 somewhere.