The Model 1602A keyboard-controlled Logic State Analyzer is intended for use in the design and troubleshooting of digital systems. The 16-bit wide, 64-word deep memory operates at clock speeds to 10 MHz and allows the instrument to capture virtually any 64-word sequence in a system. The data may be registered with versatile pattern recognition trigger and digital delay. Measurements of system activity are displayed on the 1602A LED readout in hexadecimal, decimal, octal, or binary format, which eliminates the need for base conversions by the operator. Keyboard entry of the desired trigger is in the same base as selected for the display. The 1602A probe is a single pod containing all 16 data lines, clock, clock qualifier, and ground. At the front of the pod is a standard edge connector which allows the operator to quickly move the probe from one test point to another. Probe input threshold is TTL. The Model 1602A has two rear panel TTL qualifier inputs: clock-qualifier and trigger-qualifier inputs are designed to be fully compatible with the Model 10250A “And” Gate Trigger Probe.