# syntax for a qsim help file:
# 1) a line beginning in a hash is ignored as a comment.
# 2) a command name must be preceded by a '$' and be alone on that line.
# 3) no other lines can begin with a '$'.
# 4) the literal message to be printed follows the line with $cmdName.

$ |
|                       no operation (nop).
|
  Acts as a nop, for use in TEST commands.

$ bus
BUS                     create a vector and constituent nodes.
BUS busname[n1:n2]
  Creates a vector named 'busname' and creates the nodes in the vector.
  The index ranges 'n1' to 'n2' must be nonnegative integers. The created
  nodes have names 'busname[n]', where n ranges from 'n1' to 'n2' inclusive.
  Neither the vector name nor any of the node names can previously exist.
  The second index may be either larger or smaller than the first.

$ capacitor
CAPACITOR               add capacitance to a node.
CAPACITOR type node1 node2 x y cap_value
  Adds capacitance to the two nodes. One of them must be a VSS node.
  'type' must be "nn", 'x' and 'y' are ignored, 'cap_value' is in pF.

$ check
CHECK                   (unused).
CHECK (unused).

$ checkpoint
CHECKPOINT              show fault coverage at given interval
CHECKPOINT number
  Tells ProFault to write fault simulation results to the screen every 'number'
  of strobes.

$ chipparms
CHIPPARMS               set simulation parameters for part of the circuit.
CHIPPARMS
CHIPPARMS .
CHIPPARMS pathName parmName1 parmValue1 parmName2 parmValue2 ...
  Sets the SIMPARM values for a part of the circuit. The 'pathName' must be
  an instance name, possibly ending in a wildcard (asterisk). All instances
  that start with this name will be affected by the given parameters. The
  legal names for the name/value pairs can be found under SIMPARMS (exclude
  timeScale and the catch-all delayFactor). If no arguments are given, then
  the currently defined chipparms will be displayed. If a period is given as
  the first argument, then all chipparms will be disposed.

$ cycle
CYCLE                   run the simulation.
CYCLE number
  Continues the simulation for 'number' more cycles of the primary clock.
  If the simulation is already midcycle then it will run one complete
  cycle, ending again in midcycle. If the simulation is in midphase,
  then completion of the current phase is counted as one entire phase.
  If 'number' is not given then it is assumed to be one. If 'number' is
  given as zero, then the simulation is run until the end of the current
  cycle.

$ echo
ECHO                    print a message in the transcript.
ECHO (options) string
  Writes the message 'string' to the trace file and the transcript pane.
  The message will be preceded by a comment mark "#".
  Options: TIME    writes the current simulator time before the message.

$ equiv
EQUIV                   add another name for an object.
EQUIV name
  Makes 'name' the preferred name for the node or vector.
EQUIV oldname newnames
  The names listed in 'newnames' become synonyms for 'oldname'.

$ event
EVENT                   list gate/model event counts
EVENT
  Lists the number of gate/model evaluations since the last call to this command.
  Also lists the cumulative number of evaluations.

$ exit
EXIT                    terminate the simulation.
EXIT
  Terminate the simulation and close down the simulator. Same as QUIT.

$ join
JOIN                    join two nodes into one.
JOIN node nodelist
  Joins each of the nodes in 'nodelist' to 'node'. The nodes then behave
  as if they are wired directly to each other. The 'nodelist' names become
  synonyms for 'node'.
JOIN vector nodelist
  Joins the nth node in 'nodelist' to the nth member of 'vector'. Nodelist
  can contain any combination of nodes, subvectors, and vectors, but the
  total number of nodes named must equal the size of 'vector'.
JOIN nodelist1 ; nodelist2
  Joins the nth node in 'nodelist1' to the nth member of 'nodelist2'. Both
  lists can contain any combination of nodes, subvectors, and vectors, but
  their total number of nodes must agree.

$ load
LOAD                    load a netlist, command file, or model instance.
LOAD (options) cell
LOAD (options) cell instanceName
LOAD (options) cell instanceName parameterList
  Loads a netlist file, a simulator command file, or a single model
  instance. For a netlist or instance, the top level can be given the
  optional 'instanceName'. If the netlist or instance takes parameters,
  they can be passed in 'parameterList' by name/value pairs or by "@"
  followed by a parameter cell name. If a parameter list is desired but
  an instanceName isn't, use double quotes "" for the 'instanceName'.
  The 'cell' must be of the form "[typ]name", where 'typ' is a two
  or three letter celltype and 'name' is the cellname. Valid celltypes
  for an instance are [mds] or [mde], and for a command file are [sim],
  [txt], or [bsm].
  Options: ECHO             all subsequent commands are echoed.
           ONELEVELECHO     only commands from this file are echoed.
           PARALLEL         load as a parallel interface.
           NOPREFIX         don't append instance name to global prefix.
           FLATTEN          flatten the netlist, even if a flattened type.
           NOFLATTEN        don't flatten, even if a hierarchical type.
           HNL              load using the old netlist system.
           PIPE             load a netlist via pipe, reduces memory usage.

$ manager
MANAGER                 call the cell/library manager.
MANAGER
  Opens up a session with the VLSImanager.

$ mode
MODE                    select command language.
MODE type
  Declares the simulator command language to be used. The two choices 
  currently supported are VLSIsim ('type' = VLSISIM) or VLSIqsim ('type' = VLSIQSIM).

$ module
MODULE                  load a simulation driver module.
MODULE (options) name
MODULE (options) name arguments
  Loads a mainsail simulation driver module. A new user interface is 
  created to run the driver. If 'arguments' exists, then the rest of the
  line is passed as given to the module. A QUIT command cannot be executed
  while under the control of a module. If the NEW option is not given and
  the module has been previously invoked, then the module will be run with
  all of its internal variables intact.
  Options:  ECHO            all subsequent commands are echoed.
            ONELEVELECHO    only commands from this module are echoed.
            NEW             reinitialize module's internal variables.

$ node
NODE                    create new nodes.
NODE name
  Creates a new node called 'name'.

$ phase
PHASE                   run the simulation.
PHASE number
  Continues the simulation for 'number' more phases of the primary clock.
  If the simulation is in midphase, then completion of the current phase
  is counted as one entire phase. If 'number' is not given then it is
  assumed to be one.

$ pop
POP                     terminate command file.
POP (options)
  Terminates the present interface and returns control to the parent one.
  If the current input is from a command file, then the file is closed.
  This function cannot be used to exit from a simulation driver module.
  Options: TOP          exit all non-module interfaces.
           PARALLEL     closes a parallel command file.

$ power
POWER                   calls power calculation module.
POWER (options)
  Calls the power calculation module.
  Options: COMMAND      calls the command interface in the power module.


$ preprocess
PREPROCESS              execute simulation preprocessing.
PREPROCESS
  Immediately executes circuit preprocessing.

$ quit
QUIT                    terminate the simulation.
QUIT
  Terminate the simulation and close down the simulator. Same as EXIT.

$ rename
RENAME                  change the name of an object.
RENAME oldname newname
  It is preferred that a user NEVER uses this command !
  Removes the name 'oldname' for a node or vector and adds the preferred
  synonym 'newname'.

$ request
REQUEST                 send user-request to a model instance.
REQUEST instanceName arg1 arg2
  Sends the two string arguments as a user request to a model 'instanceName'.
  The model's response is printed. The arguments are optional, the default
  being an empty string. If an argument is not contained in double quotes,
  then it is considered to end at the first blank space.

$ reset
RESET                   resets the simulation without disposing the netlist.
RESET (options)
  Resets the simulation to the beginning without the need to reload the
  netlist. It returns the simulator to the state just after netlist loading.
  Time equals zero, all nodes are unknown, and there are no definitions
  for clocks, vectors, or watched nodes. Simparms and connectivity can
  be altered up until the next preprocessing.
  Options:  VECTOR      don't dispose vector definitions.
            WATCHED     retain the watched node list.
            CLOCKS      keep the existing clocks.
            SAVEALL     use all the above options.

$ restore
RESTORE                 (not implemented).
RESTORE     (not implemented).

$ save
SAVE                    (not implemented).
SAVE        (not implemented).

$ selectmodel
SELECTMODEL             force use of [mde] rather than [qfe]
SELECTMODEL
  Lists the cells that have the [qfe] switching disabled.
SELECTMODEL cellname
  Specifies that the automatic [qfe] switching should be disabled for
  all netlist instances of the named cell.

$ set
SET                     (type SET ?)

$ show
SHOW                    (type SHOW ?)

$ step
STEP                    run the simulation.
STEP (options) number
  Continues the simulation for 'number' nanoseconds.
  Options: DEFERCLOCKS   run simulation without changing clocks.

$ strobe
STROBE                  declare fault-sim strobing pins
STROBE nodelist
  Declares which nodes will be strobed during fault simulation.

$ test
TEST                    compare a node's actual versus expected value.
TEST (options) name value
TEST (options) name value mask
TEST (options) name value mask command
  Compare the logical value of the named node or vector with 'value'.
  If they don't match, the test fails and an error message is written.
  If a mask is given, then only those bits that are a "1" in 'mask' are
  included in the comparison. If 'command' is given, then a failed test
  will suppress the error message and execute 'command'.
  Options: NOTEQUAL   test succeeds if the values are not equal.
           MESSAGE    write the error message, even if 'command' exists.

$ transistor
TRANSISTOR              add a transistor to the circuit.
TRANSISTOR type gate source drain
  Creates a gate approximation for a transistor and inserts it into the
  circuit. Only two choices for 'type' are allowed, P for pullups, and
  E for pulldowns. The next three arguments are the node names for attaching
  the three active transistor pins. Transistors are given a default timing
  delay.

$ translate
TRANSLATE               translate command file to another format.
TRANSLATE type cellname
  Translates subsequent command input into another language and writes it
  to a file. The necessary translation module must be available to the
  simulator. The choices for 'type' are:
    VLSISIM   translate VLSIqsim language to VLSIsim language.
    VLSIQSIM  translate VLSIsim to VLSIqsim.
    BINARY    translate either VLSIsim or VLSIqsim into a qsim binary format.
  The translations are written into "[sim]cellname" for VLSISIM and VLSIQSIM, and
  into "[bsm]cellname" for BINARY.
TRANSLATE type .
  Ends the specified translation session and closes the file.
  
$ unwatch
UNWATCH                 remove nodes from the watched list.
UNWATCH nodelist
  Removes the watched status from the named nodes and vectors.

$ vector
VECTOR                  group nodes under one name for easy reference.
VECTOR name nodelist
  Creates a vector 'name' made up of the named nodes. The vector indices
  will be 1 to n, where n is the number of nodes named.
VECTOR name[lb:rb] nodelist
  Creates the vector, but the indices run from 'lb' up/down to 'rb'.
VECTOR name[lb:ub]
  Creates the vector using the nodes "name[lb]" through "name[ub]".
  As in all forms of the VECTOR command, the nodes must previously exist.

$ view
VIEW                    list node's current logical state.
VIEW
  Show the logic values of all watched items.
VIEW nodelist
  Show the values of all named nodes and vectors.


$ vtitest
VLSITEST                (unused).


$ watch
WATCH                   automatically list all node's transitions.
WATCH (options) nodelist
  Add the named nodes and vectors to the watched list for trace output.
  Options: DISPLAY   display the waveform.
           NOSPACE   suppresses spaces between tabular columns.




$ show after
SHOW AFTER              display instances with particular node as input.
SHOW AFTER nodename
  Displays information about the instances that have the named node as
  an input.

$ show alias
SHOW ALIAS              list special command abbreviations.
SHOW ALIAS
  Lists all presently defined aliases.

$ set alias
SET ALIAS               define special command abbreviations.
SET ALIAS name
  Removes the alias definition for the 'name'.
SET ALIAS name string
  Defines 'name' as an alias for 'string'. All uses of 'name' at the
  beginning of a command will substitute in 'string'. Aliases may NOT
  be abbreviated. If 'name' already exists, the old definition will be
  superceded by the new.

$ show before
SHOW BEFORE             display instances with particular node as output.
SHOW BEFORE nodename
  Displays information about all the instances that have the named node
  as an output.

$ show capacitance
SHOW CAPACITANCE        list node's capacitance.
SHOW CAPACITANCE nodelist
  Lists the capacitances of the nodes in 'nodelist'.

$ set capacitance
SET CAPACITANCE         set a node's capacitance to a particular value.
SET CAPACITANCE number nodelist
  Sets the total capacitance on the listed nodes to be 'number' pF. The
  old capacitance cannot be reinstated.

$ set charged
SET CHARGED             set nodes to a floating/undriven logical state.
SET CHARGED value nodelist
  Sets the listed nodes to a floating (capacitive) state. The logical value
  will be either 'value' (HIGH, LOW, UNKNOWN), or the current nodal value if
  'value' is "*". The new state can be overridden by the circuit.

$ set chipparms
SET CHIPPARMS           set simulation parameters for part of the circuit.
SET CHIPPARMS .
SET CHIPPARMS pathName parmName1 parmValue1 parmName2 parmValue2 ...
  Sets the SIMPARM values for a part of the circuit. The 'pathName' must be
  an instance name, possibly ending in a wildcard (asterisk). All instances
  that start with this name will be affected by the given parameters. The
  legal names for the name/value pairs can be found under SIMPARMS (exclude
  timeScale and the catch-all delayFactor). If a period is given as the
  first argument, then all chipparms will be disposed.

$ show chipparms
SHOW CHIPPARMS          show the current simulation parameters for part of the circuit.
SHOW CHIPPARMS
  The SET CHIPPARMS command will set simulation parameters for
  particular branches of the netlist hierarchy. This command
  will display all such sets of simulation parameters.

$ show clock
SHOW CLOCK              list a clocked node.
SHOW CLOCK
  Lists information about all the defined clocks.
$ set clock
SET CLOCK               define a clocked node.
SET CLOCK name
  Removes clock definition for named node.
SET CLOCK (options) name clock_spec
  Makes the named node into a clock. The 'clock_spec' is a sequence of
  entries of the form "value(time)", where 'value' is the logical value
  of "1" or "0" for the phase, and 'time' is the duration of the phase
  in nanoseconds. If "(time)" is omitted, the duration defaults to the
  previously given duration or 400 ns if no durations have been given so
  far. An initial, nonrepeating sequence can be given by seperating these
  entries from the rest by a semicolon. A new definition for a node will
  override the previous one. Until explicitly defined, all three options
  default onto the first clock.
  Options: PRIMARY         for CYCLE and PHASE commands.
           REPORT          for static trace output.
           PROFAULT        for fault simulation strobing period.

$ show diagnostics
SHOW DIAGNOSITCS        (unused).

$ show external
SHOW EXTERNAL           (unused).

$ set external
SET EXTERNAL            (unused).

$ set forced
SET FORCED              force nodes to a particular logical state.
SET FORCED value nodelist
SET FORCED VECTOR  vector_name  vector_value
  see SET INPUTS.

$ show gates
SHOW GATES              lists parameters for gate models.

$ show inputs
SHOW INPUTS             (unused).

$ set inputs
SET INPUTS              set nodes to a particular logical state.
SET INPUTS value nodelist
  Sets the listed nodes to the specified logic value. 'value' must be: HIGH,
  LOW, or UNKNOWN. 'nodelist' can contain any combination of node names,
  subvectors, and wildcards. The nodes are forced to the value and cannot
  be overriden by any gate evaluations.
SET INPUTS VECTOR  vector_name  vector_value
  Sets the named vector to the given value. The 'vector_value' must have a
  radix indicator followed by a value string. A radix indicator is an
  apostrophe and a letter: 'b = binary, 'o = octal, 'd = decimal, 'h = hex-
  adecimal. Only one vector can be handled per line.

$ show instances
SHOW INSTANCES          display information about particular circuit instances.
SHOW INSTANCES instanceName
  Displays information about the named instance. Information includes the
  gate/cell type, pin names, attached nodes, and pin/node logic values.

$ show interfaces
SHOW INTERFACES         lists currently existing user interfaces.
SHOW INTERFACES
  Lists the presently defined user interfaces. 

$ show linelimit
SHOW LINELIMIT          show limit on simulator output to the transcript.
SHOW LINELIMIT
  Shows the linelimit parameters. The linelimit count is the maximum lines
  of output the simulator can spew for a command. The prompting flag deter-
  mines whether the user can ask for more output.

$ set linelimit
SET LINELIMIT           set limit on simulator output to the transcript.
SET LINELIMIT number
  Sets the linelimit count to 'number'. To set the prompting flag, see the
  command SET OPTIONS.

$ show logiclevels
SHOW LOGICLEVELS        (unused).

$ set logiclevels
SET LOGICLEVELS         (unused).

$ show minmaxmode
SHOW MINMAXMODE         (unused).

$ set minmaxmode
SET MINNMAXMODE         (unused).

$ show mode
SHOW MODE               (unused).

$ set mode
SET MODE                (unused).

$ set modeloptions
SET MODELOPTIONS        sets options for model errors.
SET MODELOPTIONS name
  Sets the named modeloption. To turn an option on, give the name.
  To turn it off, precede the name with a minus sign (-). These
  control model behavior in an error condition and echoing of
  model error messages. Legal names can be listed by SHOW MODELOPTIONS.
  At least one modeloption MUST be on at circuit loading if the user
  intends to do any error checking in a simulation.

$ show modeloptions
SHOW MODELOPTIONS       lists the options for model errors.
SHOW MODELOPTIONS
  Lists the names and current values of the modeloptions. These
  control model behavior in an error condition, and echoing of
  model error messages.


$ show nodetypes
SHOW NODETYPES          (unused).

$ set nodetype
SET NODETYPE            (unused).

$ show names
SHOW NAMES              list existing netlist names.
SHOW NAMES (options) namelist
  Displays the names in 'namelist' that the simulator recognizes. The list
  can be any combination of node names, subvectors, vectors, instance names,
  and wildcards.
  Options: EXPAND       expands a vector name into its component nodes.
           NOSYNONYMS   lists only one name per object.

$ show options
SHOW OPTIONS            list simulator runtime options.
SHOW OPTIONS
  Lists the options and their present value.

  Options are:
    "bidirConflict"             report bidirectional conflicts.
    "failTestOnZ"               z-state nodes will fail in TEST command.
    "glitchDetection"           print simulation glitch messages.
    "literalNL"                 overrides automatic mde/qfe netlist switching.
    "noTraceHeader"             turn off machine-readable header for standard trace.
    "parallelGateMessage"       list parallel gates that are created.
    "proFault"                  perform probabilistic fault simulation.
    "prompting"                 turns on LINELIMIT feature.
    "rc"                        use RC input delays for extracted netlists.
    "standardTrace"             use the standard tabular trace output.
    "tabularReportOnChange"     use (reportOnChange) option for every WATCH.
    "translatorMessage"         print all error messages from translator.

$ set options
SET OPTIONS             set simulator runtime options.
SET OPTIONS namelist
  Sets the named options. To turn an option on, give the name. To turn it
  off, precede the name with a minus sign (-).  

  Options are:
    "bidirConflict"             report bidirectional conflicts.
    "failTestOnZ"               z-state nodes will fail in TEST command.
    "glitchDetection"           print simulation glitch messages.
    "literalNL"                 overrides automatic mde/qfe netlist switching.
    "noTraceHeader"             turn off machine-readable header for standard trace.
    "parallelGateMessage"       list parallel gates that are created.
    "proFault"                  perform probabilistic fault simulation.
    "prompting"                 turns on LINELIMIT feature.
    "rc"                        use RC input delays for extracted netlists.
    "standardTrace"             use the standard tabular trace output.
    "tabularReportOnChange"     use (reportOnChange) option for every WATCH.
    "translatorMessage"         print all error messages from translator.

$ show output
SHOW OUTPUT             list selected file for transition (trace) output.
SHOW OUTPUT
  Shows the present trace file name and the value of the dual display option.

$ set output
SET OUTPUT              select file for transition (trace) output.
SET OUTPUT
  Closes the present trace file.
SET OUTPUT * option
  Changes the dual display option without changing the trace file.
  'option' can be "dual" or "only".
SET OUTPUT filename option
  Opens 'filename' to be the new trace file. If a trace file already exists,
  it is closed. Default celltype is [trc].

$ show power
SHOW POWER              (unused).

$ set power
SET POWER               is equivalent to SET INPUTS.

$ show prefix
SHOW PREFIX             list name prefixes.
SHOW PREFIX
  Lists all defined prefixes.

$ set prefix
SET PREFIX              set name prefixes.
SET PREFIX string
  Redefine the global prefix. To clear a prefix, set it to "".
SET PREFIX name string
  Define/redefine a prefix 'name' to use 'string' as its substitution.

$ set prompting
SET PROMPTING           toggles the linelimit function.
SET PROMPTING on/off
  Turns the linelimit prompting on or off.

$ show radix
SHOW RADIX              list the global radix base for vector output.
SHOW RADIX
  Show the global radix. To see a specific radix, use the VIEW command.

$ set radix
SET RADIX               set radix base for vector output.
SET RADIX number vectorList
  Set the radices for the listed vectors to be 'number'. The only choices
  for 'number' are 2, 8, 10, 16.
  Use the VIEW command to show a vectors current radix.

$ show rc
SHOW RC                 show rc delays for a node.
SHOW RC nodename
  Lists all of the pins and the timing deltas due to rc's on the named node.

$ show reffs
SHOW REFFS              (unused).

$ set reffs
SET REFFS               (unused).

$ set risefall
SET RISEFALL            set explicit delay time for a node.
SET RISEFALL number number
  Sets the global default delays to the given values. These times only
  apply to nodes that have no other delays specified. The first argument
  is for rising transitions, the second for falling transitions. The 
  'numbers' are in nanoseconds.
SET RISEFALL number number nodelist
  Forces the listed nodes to have delay times given by the two numbers.
  The new delays will override all other delay calculations. To remove
  the override, set both times to zero.

$ show risefall
SHOW RISEFALL           list explicitly declared delays.
SHOW RISEFALL nodelist
  Shows the explicit rise/fall delays for all listed nodes.

$ show savedstates
SHOW SAVEDSTATES        list saved states for this simulation.
SHOW SAVEDSTATES
  Lists the currently saved states. (See save/restore).

$ show simparms
SHOW SIMPARMS           list some simulation parameters.
SHOW SIMPARMS
  Lists the names and values for the user-setable simulation parameters.

$ set simparms
SET SIMPARMS            set some simulation parameters.
SET SIMPARMS name number
  Sets the named parameter to the given value. Use the SHOW SIMPARMS command
  to see the names and units for each entry.

$ show slowestpath
SHOW SLOWESTPATH        (unused).

$ show spiceparms
SHOW SPICEPARMS         (unused).

$ set spiceparms
SET SPICEPARMS          (unused).

$ show status
SHOW STATUS             list information about the loaded netlist.
SHOW STATUS
  Displays information about the current circuit size.

$ show switch
SHOW SWITCH             list the current netlist flattening switch.
SHOW SWITCH
  Displays the current netlist switch name.

$ set switch
SET SWITCH              set/clear a netlist flattening switch.
SET SWITCH cell
  Sets the current netlist switch name to 'cell'.

$ show synonyms
SHOW SYNONYMS           list all names for an object.
SHOW SYNONYMS name
  Show all synonyms defined for 'name'.

$ show technology
SHOW TECHNOLOGY         (unused).

$ set technology
SET TECHNOLOGY          (unused).

$ show time
SHOW TIME               list the current simulator time.
SHOW TIME
  Show the current simulation time.

$ show toggles
SHOW TOGGLES            lists toggle counts for nodes.
SHOW TOGGLES (options) namelist
  Lists information about high/low toggle counts for nodes. If namelist
  isn't given, then the nodes that haven't toggled will be listed. The
  option TOTALS will suppress listing the node names, and will just give
  the number of nodes not toggled.  If namelist is specified then the
  toggle counts for the named nodes will be listed. Each node will have
  two numbers, transitions to low and to high. 

$ set toggles
SET TOGGLES             clears the nodes' toggle counts.
SET TOGGLES
  Resets all the nodal toggle counts to zero.

$ show trace
SHOW TRACE              show format for transition (trace) output.
SHOW TRACE
  Show trace output information.
  Standard trace output has the following coding:
           enable on        0  1  u
           enable unknown   q  r  x
           enable off       s  t  z

$ set trace
SET TRACE               set format for transition (trace) output.
SET TRACE MODE type headerSize pageSize clusterSize formfeed
  Set the output mode for trace information.
  'type' can be:
    DYNAMIC    output occurs when each item changes.
    STATIC     output occurs at the end of each clock phase.
    TABULAR    writes the output in tabular form.
  The optional arguments are used for tabular form only.
  HeaderSize is the number of characters written for each name in the header.
  PageSize is the number of lines of trace output per page, including header.
  ClusterSize sets the size of the column groupings in the tabular output.
  Formfeed, either FF or NOFF, issues a formfeed between each page of output.
SET TRACE INTERVAL
  This command is ignored by qsim.
SET TRACE SELECTION type
  In qsim, type can be either ALL or NONE. The later will cause the trace
  output to be suppressed.

  Standard trace output has the following coding:
           enable on        0  1  u
           enable unknown   q  r  x
           enable off       s  t  z

$ show transtypes
SHOW TRANSTYPES         (unused).

$ set transtype
SET TRANSTYPE           (unused).

$ show traps
SHOW TRAPS              (unused). 

$ set traps
SET TRAPS               (unused). 

$ show units
SHOW UNITS              (unused).

$ set units
SET UNITS               (unused).

$ show unsettled
SHOW UNSETTLED          (unused).

$ show vectors
SHOW VECTOR             list information about a vector.
SHOW VECTORS vector_name
  Displays information about the named vector.

$ show viewmode
SHOW VIEWMODE           (unused).

$ set viewmode
SET VIEWMODE            (unused).

$ show wavefile
SHOW WAVEFILE           list the cellname for saving waveforms.
SHOW WAVEFILE 
  Display the current cellname for saving waveforms.

$ set wavefile
SET WAVEFILE            save transition information for graphic display later.
SET WAVEFILE 
  Close the current waveform cell.
SET WAVEFILE cellname
  Create cells "[wfd]cellname" and "[wft]cellname" and start saving all
  waveform information in these cells. If a cell already is opened, it
  is closed and saved.