Logisym is a digital logic simulator, intended to assist you in
understanding, debugging, and verifying, the operations of
combinational and sequential digital logic circuits The simulator
utilizes a 'unit delay' model, and very accurately represents the
operations of circuits built from the basic logic functions,
providing a timing diagram of the trace output, much like a 16
trace ocilloscope The device library internal to logisym includes
the following functions: AND, OR, NAND, NOR, (up to 8 input); XOR,
NOT, BUFFER an RS flipflop (cross coupled NAND), a positive edge
triggered D type flipflop, and a positive edge triggered JK
flipflop Up to 650 logic devices may be defined, and 16 points may
be observed during a simulation Logisym provides 26 different
signals or 'clocks' to be used as inputs to the circuit(s) being
simulated. These are: A variable frequency eight bit up/down
counter, a variable frequency four bit ring counter, a variable
rate random data generator, and eight bits of data controlled by
way of the function keys on the keyboard. Fixed high and low logic
levels are also available as tiepoints for unused inputs.
