When the user guide prominently includes a wiring diagram for adding the memory necessary to run the product:

http://users.telenet.be/kim1-6502/6502/2ksa/2ksa.html

Cover:Schematics for a 5V, 3A regulated power supply and a 1K x 8 read/write memory block. The power supply and three such memory blocks can be added to the basic KIM-l microcomputer to provide the 4K RAM required by this assembler. Parts are available from Jameco Electronics.