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Revision List

Summary of major changes and bug fixes

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5Spice version 1.40, March 10, 2008

NEW FEATURES

Network licensing option, concurrent user model

5Spice file locations changed in Vista and XP starting with v1.30. Add main menu TOOLS entry that lists the file and Library locations for your computer.

"Power" (interconnect) schematic symbol
allow full range of characters for the symbol's name that appears in the schematic

Single Frequency FM waveform in Transient analysis

Add comparator with input hysteresis to digital logic gates

Ability to plot relative phase difference between signals at two TestPoints

Transferring the program's registration
Add a simpler method for users to transfer the registration when re-installing Windows or moving to a new computer. See "transfer the registration" under main menu HELP.

Warn user when they select a modern MOSFET model for IC design that it may not be implemented or may need correct LEVEL and VERSION set.

BUG FIXES

Transmission line
In AC analysis the phase would be wrong if the line length was not equal to one and no resistance per length was specified.

numbers using comma separator (number written as 1,23)
fixed bugs when these numbers were used with internal Transformer and OpAmp models.

diagonal lines in graph with 4 plots
fixed bug that occured with 4 TestPoints that have long names

fix bug that caused errors if running two copies of the program and simulating in both copies. Still can't have both simulations run simultaneously.

detect Zetex power MOSFETs properly that were not showing in selection lists.

fix bug that hid error reporting of problems in individual Library .Models

fix text spacing when schematic text is written in vertical orientation

fix bug that prevented program closing if 5Spice.ini file was missing

fix bug that caused "not a number" error message in .MODEL if IS={parameter}. There was no problem in the usual case where IS = a number.

ignore .HTM and .HTML files in Library (Spice cannot parse these files)

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5Spice version 1.30, May 30, 2007

first Vista compatible release

NEW FEATURES in VISTA & XP

v1.30 installs using different directories than previous versions of the program. If an older version is installed, this install relocates existing 5Spice files and the Library to their new locations.

Vista: We strongly recommend you move any files you created that Vista has hidden in 

drive:\Users\{UserName}\AppData\Local\VirtualStore\Program Files\5Spice Analysis\

and put them in your Documents folder

drive:\Users\{UserName}\Documents\5Spice Analysis

5Spice has a more modern look in XP and Vista than before.
You can run this version as an ordinary user in Vista and XP.
All users on the computer share a common Library and configuration file.

NEW FEATURES 

Help
more content, much larger table of contents and index, works in Vista

Transformer with saturating core added. can also use as saturating inductor.

demo schematics and models from C. Basso's new book (published January 2008)

Switch-Mode Power Supplies: SPICE Simulations and Practical Designs.

progress indicator during simulation, wait message while loading graph data.

wait times to load model lists
wait times are improved for large (>2000) discrete model Libraries, hour glass cursor shows while waiting.

Help Convergence checkboxes renamed for clarity.

The Add Shunts convergence helper is no longer automatic.
The user now selects it manually. Also fixed a WinSpice bug that caused the "time step too small" error at the start of Transient analysis for some circuits when shunts were added.

power MOSFETs
detect MOSFET subcircuits that model single device using both P and N MOSFETs and add to Library index.

allow lower case "k" for Kilo as well as "K" when entering numbers: 33k or 33K

schematic block copy operation
now re-numbers copied components if auto-numbering is enabled.

allow .MODELS to use subcircuit parameters to set model parameters

change number of horizontal divisions in DC graphs from 13 to 10 maximum.

Maxim and Linear Tech sections of Library updated.

BUG FIXES

autoscale of graph's horizontal axis re-written for more intuitve use plus bug fixes.

in countries where numbers are written 1,23

graph's combined plot: negative values would give "not recognized" error.
subcircuit parameter value: entering number with a comma caused error.

numbers written as 3k7
are not read correctly by Spice but user did not receive error message. added error message.

PWL waveform not working in FFT analysis.

a schematic saved with a block selected would lock up when reloaded.

entering invalid registration code caused error message: ** Notp

VSwitch, ISwitch
not using PSpice default parameter values if model call didn't specify a value. ISwitch in subcircuit - not using Ion and Ioff parameter values.

using multiple sources in an Analysis
when switching to another Analysis and then back, only one source remained selected.

"M" in subcircuit parameter values
users were instructed to use M for 1E6 when entering subcircuit parameter values while editing a schematic symbol but program used 1E-3. now uses 1E6.

drawing a wire from end of a component pin
back under the pin caused error message about multiple pins. drawing wire like this now works.

power MOSFETs

fix bug where IS=0 (HSpice syntax) caused simulation engine to crash.
fix error message using 3 node MOSFET subcircuit with 3 terminal small signal MOSFET schematic symbol.

WinSpice bugs

fix error where both WinSpice and 5Spice would stop processing multiple continuation lines in rare cases.
fix WinSpice crash when unusual values are entered for diode parameters.
fix incorrect evaluation of certain less common forms of POLY statement.

 

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5Spice version 1.22, September 27, 2005 
(maintenance release)

warn user when Spice adds shunt resistors to achieve DC bias convergence.

clarify pin order for adding pin names to Opamp subcircuit symbol.

fix bug after adding pin names to OpAmp subcircuit symbol - sometimes symbol would not connect to circuit properly.

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5Spice version 1.21, September 4, 2005 
(maintenance release for v1.20)

overseas users: fix v1.20 bugs for users in countries where numbers are written as 1,23 (not 1.23)

Transient, Distortion, FFT analyses - simulation never ends
Calculated plots - "not a valid floating point number" error

logic gates, v1.20

user set logic Level and logic Threshold were only applied during
Transient and Distortion analysis.  now applied in all analyses.

Risetime and one-shot Pulsewidth setting were not applied during FFT. fixed.

convergence help checkbox

was not applied during AC,DC Sensitivity analysis. this bug in all previous releases. fixed

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5Spice version 1.20, September 1, 2005

NEW FEATURES

FFT analysis, demo schematic using FFT

four input NonLinear Source

One-shot and D Flip-Flop

built-in logic gates

- now available in unregistered version. schematic can't be saved.
- global setting of logic high level, logic threshold and risetime
- when using large Transient time step values, logic internal time constants
- track time step value for faster simulation and reliable clocking.

auto-numbering of components as they are added to schematic. can be turned off.

schematic symbols linked to subcircuits/models
  - option to hide the library file name

squarewave SignalSource
 - option to start squarewave from zero volts

graphs
 - user can change the scale of the horizontal axis after graph is created

graph of phase
 - option to have phase range from 0-360 degrees (default is from -180 to +180 degrees)

Library rebuild error report contains more detail on errors in subcircuits

Running under Win2000 and XP: remove length limitation on schematic Notes page and SignalSource's PWL datapoint list.

allow setting GMIN to smaller value = 1E-14

BUGS / IMPROVEMENTS

graph of noise - now works with sweeping a component value or temperature

new install program

 - does not have the "missing file" problem installing under XP service pack 2
 
 - does not contain bug that can cause Windows to falsely think the Tahoma font files are missing after an un-install of 5Spice. See website FAQ for fix if you have this problem.

schematic Notes and SignalSource's PWL list
 - under Win2000 and XP, if user entered more than 64K of text, then saved the schematic file, file would fail during loading when re-opened.

wrong phase reported in ac analysis
 - when imaginary part equaled exactly 0 and real part=negative value, program reported phase=0 instead of -180 degrees.

wire terminated with only a junction was not reported as un-connected - simulation would run with this wiring error.

deleting a schematic part that has error circles at its pins and then performing 10 or more deletes could cause repeating error message. fixed.

MOSFET symbol linked to subcircuit - simulation would fail if user did not specify at least one geometry parameter.

some very old Burr-Brown (now Analog Devices) subcircuit files are still in DOS format. 5Spice included DOS file termination character when it submitted subcircuit to WinSpice. WinSpice would halt while reading circuit description.

Distortion analysis
 - changed from first to third order interpolation of data onto time grid for more consistant results at distortion levels less then 1%.
 - if transient data was all zero's, math would fail with error msg and program would misbehave.
 - if user entered 0 for stabilization time, would get error msg.

Project Wizard
selecting Added Resistances checkboxes caused GMIN and PIVTOL to be mistakenly set to their overriden values, not their calculated values. Did not affect simulation but was confusing to the user.

double clicking a graph in a separate window would bring up the rescale axis dialog for the main graph.

.PARAM line
program would label as error a line where second parameter uses the first in its definition:
 .PARAM  Rwidth=10K  Cwidth=PulseWidth/Rwidth

syntax errors in manufacturers' subcircuits
 - large LTC model file sometimes uses .END instead of .ENDS
 accept error
  - rare: if subcircuit is missing .ENDS entirely, does not appear in program's Library index or error report. Fix and accept if file has only one subcircuit, otherwise report error.
 - International Rectifier and some others violate PSpice syntax by not including the equals sign in "VALUE={  }" syntax. accept syntax error
 - LTC model file - some .Model lines for PSpice's VSwitch use brackets [ ] instead of parentheses (  ). accept syntax error

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5Spice version 1.11. February 4, 2005 (maintenance release)

added demo schematics for power dissipation

BUGS / IMPROVEMENTS

swept/stepped component value
when data appeared in a table the swept value was not displayed correctly after the first step. fixed.

calculated Plot and the Pac (power) operator
fix Pac not calculating power correctly in analyses other than AC. change operator name from Pac to Pwr

component parameter TestPoint
we had blocked selecting the power parameter in v1.10 due to last minute bug. further investigation shows Spice reports power OK except in AC analysis. Spice source code notes that other parameters may also be reported incorrectly in AC analysis.
1. allow use of power parameter
2. prevent use of the parameter TestPoint in AC analysis
Also fixed access violation error when user edits TestPoint and then presses OK to close but has not selected a parameter.

TestPoints selected to appear in DC analysis data tables were not being checked for valid TestPoint names.

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5Spice version 1.10 December 28, 2004

NEW FEATURES

AC Sensitivity analysis (for registered users)

new TestPoint shows device power, junction capacitance and small signal parameters (for registered users)

allow graph Plot to be calculated from data of two TestPoints

add Potentiometer component - wiper position can be swept in analysis.

analysis Temperature displayed on status line below schematic

allow generic subcircuit symbol's parameter fields to be positioned relative to symbol body

Duplicate and missing reference numbers - highlight in the schematic so easy to find

option to save visible portion of schematic to .EMF image file

swept component/temperature values in Graph:

add display under XY readout cursor box listing the swept component values. clicking on a value makes cursor readout the values of the associated graph plot.

Distortion graph - add background to identify "circuit stabilization time" portion of waveform

Graph plot linestyle and color - add button to save user choices as the program default settings

C size printing - add alignment marks for joining the two sheets of paper.

Component tolerance - display with % sign in schematic.

external subcircuits - allow math functions in expressions

BUGS / IMPROVEMENTS

Fix drawing problems in user interface on newer displays with very high resolution on small screen. Occured when Window's display is set for "Large Fonts".

Printing bug - occasionally schematic printed as double image. In Japan no schematic printing. Fixed.

endless Errors on Schematic Load - a SignalSource rotated 90 in the schematic would cause endless errors when file was reloaded. Fixed.

better error handling when trying to load a schematic from a newer version of 5Spice.

SignalSource with PWL waveform

fixed bug limiting length of PWL list to 255 characters

fixed bug where after user defines a PWL waveform, schematic symbol still says "Piecewise undefined".

DC analysis, table of results - allow user to select which TestPoints are displayed in table

MOSFET symbol linked to subcircuit - fix to pass geometry parameters to subcircuit

graph AC magnitude in dB,  fix for log(0)

log(0) is undefined (-infinity), graph was showing 0. 
Fix: display -999 for log(0) and also if signal < 0

parsing multiple expressions in a line - only first expression was handled correctly.

mosfet call example:   W={PW} L={PL}
"L" was flagged as "name not recognized". fixed.

graph label overlap with log frequency scale fixed.

graph XY readout with log frequency scale - the Y value interpolation between datapoints was wrong. fixed.

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5Spice version 1.02 June 02, 2004

NEW FEATURES

export data from graph/table to file for import into other programs. requires program registration

added tool to scan for .models missing parameters that can cause the Transient "timestep too small" error/failure in certain cases

BUGS / IMPROVEMENTS

expanded Help for "timestep too small" error

revise IdealDiode.lib library file for more realistic voltage drops

allow user to turn off MOSFET model and file names in schematic

swept/stepped component or temperature value - increase max number of steps to 10

reverse initial placement orientation of diodes (except zener)

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5Spice version 1.01 May 07, 2004

NEW FEATURES

shortcut CRTL+P for Print

shortcut  CTRL+S for SaveAll files

ability to show graphs in a separate windows. allows visual comparison. graphs can be from same or different schematics.

IGBT, SCR and TRIAC schematic symbols

center tapped and three winding transformer symbols

support for .PARAM statements in subcircuits (note: trying to set Spice global parameters like GMIN with .PARAM statement inside a subcircuit is flagged as an error.)

switch mode power supply models by C. Basso now supported in both PSpice and Intusoft versions. note: program registration required to pass parameter values from schematic to subcircuits

made it easier for registered user to transfer program registration to another computer that can be recognized as belonging to them.

BUGS / IMPROVEMENTS

Arithmetic Overflow crash for WinSpice

Simulating a circuit that used subcircuit containing a PSpice controlled switch model with particular model parameters could occasionally crash WinSpice with "arithmetic overflow" error. Could depend on changes in the schematic. Problem fixed in 5Spice.

Rebuilding the Library

One subcircuit file reported with a unusual typographical error that caused 5Spice to crash with Stack Overflow error. Fixed for all typos.

B source line using named constant (e,pi,boltz,echarge) was marked as having error. Fixed.

Error reporting file: wrong line number reported for call to missing subcircuit or model. Fixed.

When checking for errors, program now distinguishes between calls to a subcircuit and a model in the same file that have the same name.

Calls to transistor models were marked as having error if the Area or Temperature parameter was used and there were spaces between it and the equals sign. Fixed.

AREA=1.0 worked     AREA = 1.0 was reported as error

PSpice syntax translation

"VALUE= {  }" syntax that used parameters passed to the subcircuit was not translated correctly to Spice3 syntax. Subcircuit would have error reported when simulation was run. Fixed.

example: Rin is a parameter

E 1 2 VALUE = {1 + Rin}

NonLinear Source (Fxy) formula syntax checking

The constant "echarge" was only accepted in the formula if mis-spelled "echarg".

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5Spice version 1.00 December 17, 2003

NOTE: Trial period for commercial use is now 30 days.

NEW FEATURES

DC Sensitivity analysis (results displayed only for registered users)

differential Testpoint added

save image of graph as .BMP or .EMF file

Backwards Euler integration method for Transient and Distortion analysis

convergence option which fixes "timestep too small" error in some circuits

basic syntax checking of the NonLinear Source's formula

rebuilding the Library generates a report file (*.rpt) of problems. the expanded error descriptions are useful if more details are needed about a problem in a subcircuit.

handle common Intersil subcircuit syntax

TIME and TEMP (temperature) available in subcircuits and NonLinear Source formula

Unregistered Programs no longer access

Noise and Distortion analysis

digital logic parts

BUGS / IMPROVEMENTS

Help - numerous improvements

Subcircuit Syntax

TEMP global variable available for B source, E and G sources with VALUE=

TIME global works in same places except in DC, Noise and Senstivity analysis. user notified with message in those analyses.

can now use IF-THEN syntax in expressions for component values

bug fixed with F source and POLY syntax that caused simulation failure.

bug fixed where function names common to Spice3 and PSpice syntax      were causing subcircuit to be marked as containing error when used in PSpice VALUE syntax.

PWR,PWRS(-3, 6) when base had unary minus sign, was not being translated correctly into Spice3. fixed.

Intersil subcircuits

now handles POLY syntax where dimension is not enclosed in ( )

now handles numbers with leading + as in    +1E-07

Graph divide by zero error, AC analysis, plot of Phase

if the real part of a simulation data point is zero, got a divide by zero error (even though the same code worked last spring). fixed

Schematic cut and paste bug fixed

if popup menu used to cut or copy and then shortcut keys used to cut or copy, program would refuse to cut or copy or selection might jump to wrong part.

Simulation Engine Error reporting

fixed situation where the last in a series of errors were reported. Generally the later errors are caused by the earlier. Now report the first error.

TestPoint with no connection

fixed bug where disconnecting a Testpoint used in a graph plot caused an unrelated error. now correct error message.

Group Delay

bug fixed where value jumped as phase moved through 180 degrees 

SubCircuit list display

bug when user un-checked the "show only matching subcircuits" box and selected a subcircuit not visible before. the program would not remember this the next time schematic was loaded. caused a "subcircuit not found" error. fixed.

Transmission Line (LTRA model) in subcircuit

program was marking subcircuit as having error. fixed.

AC Analysis Graph setup

Radians checkbox now available only if "Phase" is selected for the plot

Library Index building now ignores files with extension .BAK

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5Spice version 0.99.9 Jun 25, 2003 (first formal release of 5Spice)

NEW FEATURES

simple, generic logic functions (gates) added.

support for passing parameters from a schematic symbol to its subcircuit added for registered users.

autocompletion while drawing wires is faster. See Options to use old way.

new transformer model added

transmission line added

group delay plot available in AC graphs

BUGS / IMPROVEMENTS

*INTERNATIONAL Users

Fixed serious bug in version 0.99 for countries where Windows uses the comma " , " as the decimal separator in numbers: 1,23 (Germany, etc.). Bug causes diodes, transistors, FETs to behave as if there is a 1K resistor between each pair of terminals.

Registered WinSpice Users

fixed bug that caused program lockup with temporary key issued to registered WinSpice users who then registered 5Spice 0.99.

Conflicts in Model/Subcircuit Names

Fixed bug where two models or subcircuits could be confused if they have the same name and same file name and the files are located in different directories or the files have different extensions.

NetLink can't connect wire to

fixed bug where you could not attatch a wire to a NetLink after reloading the schematic.

RiseTimes for Pulse, Exp, Squarewave waveforms (Transient analysis)

1. Spice allows users to leave risetime entries blank. Then the risetime Spice uses equals the TimeStep. If you also leave the Timestep entry blank, it then varies with the transient runtime - and so does the risetime! Endless confusion since no one remembers this while debugging a circuit.

Fix: For squarewave with no risetime specified, 5Spice now uses a risetime equal to 1/100 of the period. For pulse and exponential wavefroms, the user must enter the risetimes.

2. if squarewave risetime is set to exactly 50% of period, the waveform distorts. Fix: limit maximum risetime to 0.499 of period.

AC Phase - no signal causes error msg

Fixed bug where a plot set for AC phase would give an error message if there was no signal (signal = 0).

B Source line in subcircuits

fixed bug where B source line was not always checked for syntax problems, did not always have units in formula removed if present.

PSpice Syntax: function PWRS, operator **

1. fixed bug where PWRS(base, exp) could return wrong sign if base < 0.

2. fixed bug where x**y was translated as x^y instead of correct abs(x)^y.

  fixed bug where a unary minus in front of x**y returned negative number.

RECOMMEND not using ** as it does not behave as in a scientific calculator!

New Transformer model

model was merger of two commonly known models. Fix: users selects which of the two models to use and enters appropriate parameters.

Singular Matrix error

5Spice would sometimes report a singular matrix error when the simulation had recovered from this error and run sucessfully. Fixed.

Canceling the Analysis Setup/Edit dialog with the ESC key

when dialog was reopened, on rare occasions would show that something had been modified when nothing had actually been changed. Fixed.

AC Graphs - dB display

user could select dB display of real or imaginary parts of AC waveform. If the real or imag part went negative, the graph displayed the negative value rather than indicating an error (dB of a negative value is an error). Fix: dB display restricted to AC magnitude only.

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5Spice version 0.99.0 (beta) March 25, 2003

* This is the first release that can accept the Registration code that is generated when you register the program!

* Users in non-English speaking countries:

Program now works properly in countries where Windows uses the comma as the decimal separator in numbers: 1,23 (Germany, etc.)

Program will not work where Windows shows a negative number as 12- or (12)

You may not use non-English characters in the program except in Notes or in the TEXT component and Title block in the schematic.

* significantly improved PSpice subcircuit syntax compatibility and bug fixes. finally at desired performance level. see Spice Compatibility in Help for details.

Subcircuits using the PSpice VSWITCH / ISWITCH model: the simulation engine was trying to model these as Spice3 switches. The PSpice model is very different. Effects: wrong results to simulation failure. Fix: implement the PSpice model.

Errors while dragging component in schematic

Drags that start and stop multiple times while turning the wiring into spaghetti no longer produce error messages.

Editing Subcircuit symbols in the schematic

A large library file causes a delay on slow computers. The cursor now changes to the hourglass to indicate the file is being loaded.

Graph Autoscale lockup

When autoscaling of axes is selected, graph would sometimes lock up if the datapoints were all the same value and this value was > 1e3. Fixed.

Noise Analysis Graph units

Input and output integrated noise are now both displayed in separate area of the graph. Integrated noise values were correct but previously the units were indicated as [volts per square root Hz]. The units have been corrected to Volts or Amps, as appropriate.

DC Analysis with Graph

Using engineering units for Signal Source's DC Start, Stop, Step values gives error. No error if output is a Table/List. Fixed.

Spice Models/Subcircuits - long names, long file names bug

Library file names or model/subcircuit names in the file exceeding about 13-14 characters were truncated. Problem: the model/file could not be found. The file name may now be any length. The model/subcircuit name may now be up to 32 characters in length.

Spice Models in Library files - unrecognized parameters

PSpice models can have parameters not defined in Spice3. These are skipped over and simulation proceeds. User is now warned at bottom of schematic when this happens.

Spice subcircuit in Library files - not copied correctly to WinSpice

if multiple subcircuits were nested inside another subcircuit and they did not have a empty line between the .ends line of the first and the .subckt line of the next, then they were not copied correctly to simulation engine. very rare situation. not found in Manufacturer's subcircuits. Fixed.

Linear Tech library file updated to 10/02/2002 version.

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5Spice version 0.98.0 (beta) December 6, 2002

* much improved PSpice subcircuit compatibility (apologies for so many bugs)

* MOSFET - add entry of geometry parameters to schematic symbol.

add four terminal MOSFET symbol (substrate connection)

* Resistor,Capacitor - add entry of temperature coefficients to schematic symbol

* DC Analysis - can now graph results

* DC Bias and DC Analysis - much improved tabular display of data

* Simulation error messages - common ones now shown inside 5Spice

* OpAmp schematic symbol - node order numbers now hidden.

prevents confusing them with package pin numbers.

* NonLinear Source schematic symbol (user specifies formula)

number of bugs in parsing formula fixed

*Major Bug Fixes

Printing Graph

settings from wrong graph could be used in a few cases.

<> symbols printed oversize.

when printing as Black and White, Title and cursor remained colored.

Dragging component

case with two lines connecting two pins of a component could lock up program.

if user pressed "V" or "E" key while dragging, mouse cursor could not be moved outside program window.

Spice POLY syntax (Analog Devices, LinearTech subcircuits)

one style used with F and H sources would give wrong answer, no error.

RES,CAP, R,C model types not recognized (subcircuits)

Polarized Capacitor symbol

acts as if value = 0 in the simulation

Diode symbol with user selected parameters

if Isat is not changed from initial value "CUSTOM", simulation engine crashes

ReBuilding Library (new installations)

If library index file IndexSub.ndx doesn't exist AND user rebuilds library AND then exit program without editing a part, get series of error messages.

Subcircuit symbol with "?" at end of reference designator

if there is subcircuit related error during simulation, presence of "?" can prevent simulation engine from recovering from the error.

Transistors, FETs, Diodes and subcircuits

program was not allowing certain subcircuits to be assigned to these symbols

Switching between pages in the program (very confusing)

Clicking more than once on a page's Tab to select it could prevent the Schematic, Notes or Report page from becoming active and usable.

Adding component to schematic when schematic is zoomed

math overflow error

In Library list of model names, those starting with M or F did not show.

DC Bias Analysis

in some cases, not labeling testpoint in output data

All Analyses- sweep of Temperature

5Spice reports simulation failure but simulation engine runs properly

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0.96.2

Graphing

fixed several problems when scale factor numbers approached 1e-9.

improved autoscaling

NonLinear (user specified formula) controlled Source

fixed bugs in schematic display of formula

fixed several serious bugs in handling formula for Spice engine

add Signum (Sgn) function and correct and expand Help coverage

bug: "m" not being accepted for "milli" suffix (1E-3) will be fixed in next release of WinSpice.

Communicating with WinSpice v1.04

Symptom: WinSpice starts but no simulation/communication.

Fix: modified program to detect correct window on machines where WinSpice has more than single window.

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0.96.0

fix bug that prevented running under WIN2000 or XP unless user was logged in at the Administrator level

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0.95.5

Astable, Bistable demo schematics

add missing transistor to library for these schematics

Nonlinear (user defined) controlled Source

simulation engine locked up if {} used in formula. prevent user from entering.

warn user not to use units (V,A, etc.) in formula.

using Logical Operators in formula

add info to Help

WinSpice 1.04 has bug, fails if formula contains engineering units "m" or "M"

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0.95.4 initial beta release