Logic analyzers have quickly become the most important tool available to the digital equipment specialist. Whether you use it to develop new systems or trouble shoot old systems, you will soon find it to be truly indispensible. The LAM 4850 is a third-generation product which brings together features and performance unavailable elsewhere. To utilize these features, you must take the time to both learn what they are and understand how to call the programs. The time invested in a thorough reading of this manual will yield an immediate return. The LAM 4850 has many modes of operation, configurations, and features which will help you solve even the most subtle software or hardware problem. We hope that you will find the material presented below informative and easy to understand. Like our products, we are continually refining our manuals and solicit your comments. Continue reading for the details on how the LAM 4850 will help you solve your logic analysis tasks with speed and ease. 1.2 GENERAL The LAM 4850 is a 48 channel logic analyzer. For convenience, each input port takes 8 inputs, and there are six input ports on the front panel. Clock and clock qualifiers enter through a rear panel port. Internally, the analyzer is divided into three memory blocks, 16 bits wide and 1024 bits (words) deep, and each memory block can be clocked independently with external or internal clocks. These three memory blocks can be organized in five ways. "Menus" are used to display the various choices you have and guide you in the set up procedure. The TRACE menu is used to set up the desired configuration. A logic analyzer may be thought of as a memory through which the 48 channels of data are streaming. Triggering the analyzer means the opposite to triggering an oscilloscope, since when we trigger, we stop the stream - literally freezing time - so that we may then examine the interval of time before and after the trigger. A four-level sequence must be satisfied by the input data prior to triggering the logic analyzer. To aid you with the choices, a Trigger Menu is available. After we have captured the time around the trigger event (or after it, if desired) we then call upon the powerful compare and search features found in the COMPARE Menu. To allow the most sophisticated searching of data to be done, a Reference Memory is used. Troubleshooting intermittents is simple with the "baby sitting" features found in both the Trigger Menu and the Compare Menu. In the timing mode, a cursor with powerful features is available. No state of the art logic analyzer would be complete without data communication and control ports, so users of IEEE bus and RS-232 as well as video output need not worry. Soon, personality probes and disassembler firmware will be available for many popular microprocessors.