Informations
KIM-1
The KIM-1 is a compact single-board computer based on the MOS6502 microprocessor, released by MOS Technology 
in 1976. It is considered one of the earliest single-board computers and achieved great success in the 1970s.
The KIM-1 features two 6530 chips that together provide 2 KB of ROM (Monitor program, 1 KB per chip), 128 bytes of RAM (64 bytes per chip), four 8-bit bidirectional I/O ports (two per chip), and two programmable clocks/timers (one per chip). The KIM-1 is equipped with 1KB of onboard RAM, which was sufficient to run a variety of programs directly at that time.
The KIM-1 includes a 23-key hexadecimal keyboard for program and instruction input and six seven-segment LED displays capable of fully displaying the 6502 CPU’s address and data information. Additionally, the KIM-1 provides TTY terminal connectivity and supports program storage and retrieval using a tape recorder.
You can find more detailed informations about the KIM-1 at: Hans' site