Improvements

            Version 2.0:

                           The gates DELAYH, DELAYL, and XNOR were added

                           The options  GATEDELAY,  WIDTH,  and  INITIAL
                           were added

                           The TIME and FANOUT options were improved

                           Error detection  was improved,  as errors  in
                           either a  circuit descriptor or chip descrip-
                           tor could  cause version 1.0 to hang, requir-
                           ing a  control-break  to  stop  the  program.
                           Now, version 2.0 detects those situations and
                           aborts.

                           Simulation time was improved by altering some
                           of the  data structures  and simplifying  the
                           chip equations  when constant  highs or  lows
                           are present

                           More chip descriptors were added.

                           

            Version 2.1:

                           Long sequences  of 1's  and 0's  in DATA  and
                           CLOCK sources  can now  be represented by re-
                           peat counts  (e.g. 111111  can  be  typed  as
                           (6*1) ).

                           The maximum delay is now 32,767 time units, a
                           great increase  over the old limit of 32 time
                           units.

                           
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                                Planned improvements

            RAM chip  implementation.   Attempting to use RAM devices in
                 LOGSIM (still)  is a  pain, and  is cautioned  against.
                 DON'T, unless  you absolutely have to.  It's just hard,
                 not dangerous  to code  a RAM  chip.   A future version
                 will have a simple facility for simulating RAM devices.

            More memory.   LOGSIM  currently can  only use less than 64K
                 for your  circuit.   In the future, this will expand to
                 the limits of your PC's memory.