[47m                --- MAIN PROGRAM COMMANDS ---                               QUIt   QUI QU Q = Quit program, return to DOS level.                            EXIt   EXI EX X = Exit program, return to DOS level; same as Quit.              HELp   HEL HE ? = Help screen display at Main Command level (this screen).      DOS    DOS DO \ = Temporary drop to DOS level (return by "EXIT" at DOS).        DIRec  DIR DI & = Set another Drive\Directory for LENA data files access;       DRIve  DRI DR &      default path is LENA program drive\directory.              REMark REM RM * = Remarks (47 char.max.) for all circuit list, solution                              display titles; carried with circuit file.                 NODe   NOD NO N = Node of solution select; default is highest node.             FREeq  FRE FR F = Frequency limit set (as single word)                          DBRef  DBR DB D = 0-db reference voltage select; default is 1 V.                SAVe   SAV SA / = Save a current solution to disk (.LNS extension).             BRIng  BRI BR B = Bring back a saved solution from disk (.LNS extension.).      SETtin SET      = Settings (freq/node/name/remarks), display only.              ON     ON  ON ( = turn ON printer; solution outputs go to printer;                                   when On, command prompt is [44m[37m Main-> [47m[30m.   OFF    OFF OF ) = turn OFF printer; solution outputs go to screen;                                   when Off, command prompt is [40m[33m MAIN*> [47m[30m.                                                                        1 of 6   
[47m                --- CIRCUIT MODEL COMMANDS at MAIN ---                      LISt   LIS LI L = List the entire circuit model to screen or printer.           WRIte  WRI WR W = Write a circuit model to disk (filename 8 char max,                                 file extension of ".LIN" automatically supplied).         REAd   REA RE R = Read circuit filename from disk (extension same as Write).    NEW    NEW NE   = Begin New circuit model entry; old circuit discarded.         ADD    ADD AD A = Add branches to an existing circuit model.                    MODify MOD MO M = Modify only component Values of a single branch. [33m*       OPEn   OPE OP O = Open (disconnect) a branch; branch remains in circuit                              model list but is not analyzed. [33m*                     CLOse  CLO CL C = Close (reconnect) a branch. [33m*                            DELete DEL DE | = Delete branch entire, higher branch numbers move down.[33m*  INSert INS IN ^ = Insert new branch; existing, higher branches move up. [33m*  NAMe   NAM NA $ = Set or change filename for circuit model.                                           [33m* [30mSpecify branch by either Branch Number or                           Type Designation.  If branch is part of a                                       macromodel, works on _entire_ macromodel.                                                                                                              56 contiguous nodes maximum;                                                   200 maximum branches.                                     2 of 6   
[47m                --- SOLUTION/ANALYSIS OUTPUT COMMANDS ---                              Two command words are normally necessary for a solution output,                               TYPE word followed by FORMAT word or...                                         FORMAT word followed by TYPE word.                                    TYPE words are:                                                  FREque FRE FR F = Node voltage and phase over Frequency limits.                 IMPeda IMP IM Z = Node impedance over Frequency limits.                                        FORMAT words are:                                                PRInt  PRI PR P = Print-Tabulate in columnar format.                            PLOt   PLO PL = = Plot with ASCII characters ("line printer" form).                                                                                             PRInt IMPedance will do an Impedance solution Print the same as                           Z PRI.                                                                                                                                                               Alternate single-word acronyms are:                                          PRF = PRInt Frequency                                                           PLF = PLot Frequency                                                            PRZ = PRInt Impedance                                                           PLZ = PLot Impedance                                                                                                                      3 of 6   
[47m                --- FREQUENCY LIMIT SETTING at MAIN ---                          FREquency by itself will result in a prompt for "minimum, maximum and                     delta" frequency limits...enter those as if they were a single         data word, no spaces, delimiting by comma, semicolon, or slant.  A                     + delta means a constant frequency increment between points, a                  - delta means the (absolute) number of logarithmic-sweep points.                  The maximum number of frequencies, linear or logarithmic, is                 200.  The minimum number of logarithmic frequency points is 3.                     LENA prompts for correction if an entry mistake was made.                                   EXAMPLES                                                       F DC at Main command selects one solution at D.C.                      F 300,5K,-200 sets a sweep from 300 Hz to 5 KHz in 200 logarithmic steps.      F 108M,137M,1M sets a linear sweep from 108 MHz to 137 MHz in 1 MHz steps;                     LENA calculates the number of steps (30 in this example).                                                                                                       Requesting a logarithmic sweep starting at DC or requesting a                   negative minimum or maximum will result in an error message.                    New frequency limits are not changed from previous limits                       until all entries check out correctly.                                                                                                 4 of 6   
[47m                --- MAIN COMMANDS, MISCELLANEOUS ---                        DATe   DAT      = Time and Date, user convenience only; drop to DOS level                            to reset calendar clock.                                   MARgin MAR MA   = Margin settings change for hardcopy printout only.  The                            default value for Left margin is 3 (range 1 to 7);                              default value for Top and Bottom margins is 5 each                              (range 1 to 6).  Expected page size is 85 columns by 66                         rows.  Printer pagination is automatic.  Screen display                         margins are NOT altered.                                   DOS    DOS DO \ = Temporary drop to DOS level, allows any DOS operation;                             return to LENA by entering EXIT at DOS level.  LENA                             remains in memory, untouched, until EXIT return.           SAVe   SAV SA / = Saves a current solution to disk; also saves the circuit                           model filename but not the circuit model itself.           BRIng  BRI BR B = Brings back a Saved solution and displays circuit model                            filename; saved solution may be printed/displayed but                           another analysis requires Reading in the circuit.                                                                                                       NO Function keys or Control-key combinations are used in LENA.                                                                           5 of 6   
[47m                --- MAIN COMMANDS, GENERAL ENTRIES ---                                     Main commands require a contiguous character string or a                    word.  Some functions require two, separated by one or more                   spaces.  Each word is parsed for first 3 characters, then first 2,                    finally first character to determine word meaning; any beyond                   3 are ignored.  If the 2nd word must be data, the                      data word is 1 to 3 alphanumeric values/items separated by a                            , (comma) or                                                                    ; (semicolon) or forward-slant                                                  /, no spaces within a data word.  Numeric data format may be               1230.0 (familiar, no exponent) or                                              1.23E+3 (computer "E-format", E for exponent) or                                  1.23K (scaling-letter suffix), each representing the value 1230.      Scaling letter must be Upper-case for greater-than-unity as in                         K M G T for Kilo, Mega, Giga, or Tera, or lower-case                        m u n p f a for milli, micro, nano, pico, femto or atto, respectively.                      Note:  For ASCII printer compatibility, letter                                u replaces Greek letter [40m[31mæ[30m[47m.                           12,34;56 is an example of a data word containing 3 separate integers.                                                                           6 of 6   
