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IMPROVE.TXT
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1987-01-02
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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.