The KIM-1 is the best known development system by MOS Technology.

But a more advanced, more expensive ($3950) system, quite rare now, is the MDT 650.

Here I present you the MOS Technology brochure, an article in the Microcomputer Digest and a userguide as published in the book Microcomputer Systems Principles featuring the 6502 KIM.

Software for the MDT 6502 was developed by Computer Applications Corporation, COMPAS.

User guide and brochure MDT 650 MOS Technology