Change the default value of the 'first-edge' parameter from -2168 to 0

skoolkit/tap2sna.py

@@ -285,7 +285,7 @@ def _set_sim_load_config(options):
     options.contended_in = False
     options.fast_load = True
     options.finish_tape = False
-    options.first_edge = -2168
+    options.first_edge = 0
     options.load = None
     options.machine = '48'
     options.pause = True
@@ -892,12 +892,10 @@ def _print_sim_load_config_help():
 --sim-load-config first-edge=N
 
   Set the time (in T-states) from the start of the tape at which to place the
-  leading edge of the first pulse (default: -2168). The default value places
-  the edge between the first and second pulses on the tape at time 0. Any
-  pulses that occur before time 0 are discarded. The EAR bit reading yielded by
-  a pulse is 0 if the 0-based index of the pulse is even (i.e. first, third,
-  fifth pulses etc.), or 1 otherwise. Some loaders require first-edge=0, which
-  effectively reverses the polarity of every pulse on the tape.
+  leading edge of the first pulse (default: 0). Any pulses that occur before
+  time 0 are discarded. The EAR bit reading yielded by a pulse is 0 if the
+  0-based index of the pulse is even (i.e. first, third, fifth pulses etc.), or
+  1 otherwise.
 
 --sim-load-config load=KEYS
 

sphinx/source/commands.rst

@@ -1398,7 +1398,7 @@ parameters are:
   simulation as soon as that address is reached, regardless of whether the tape
   has finished (``0``, the default)
 * ``first-edge`` - the time (in T-states) from the start of the tape at which
-  to place the leading edge of the first pulse (default: ``-2168``)
+  to place the leading edge of the first pulse (default: ``0``)
 * ``load`` - a space-separated list of keys to press to build an alternative
   command line to load the tape (see below)
 * ``machine`` - the type of machine to simulate: a 48K Spectrum (``48``, the
@@ -1412,14 +1412,11 @@ parameters are:
 * ``trace`` - the file to which to log all instructions executed during the
   simulated LOAD (default: none)
 
-The default value of the ``first-edge`` parameter (-2168) places the edge
-between the first and second pulses on the tape at time 0. Any pulses that
-occur before time 0 are discarded. The EAR bit reading yielded by a pulse is 0
-if the 0-based index of the pulse is even (i.e. first, third, fifth pulses
-etc.), or 1 otherwise. Some loaders require ``first-edge=0``, which effectively
-reverses the polarity of every pulse on the tape. Run *tap2sna.py* with the
-``--tape-analysis`` option to see the timings and EAR bit readings of the
-pulses on a tape.
+If ``first-edge`` is set to a negative number, any pulses that occur before
+time 0 are discarded. The EAR bit reading yielded by a pulse is 0 if the
+0-based index of the pulse is even (i.e. first, third, fifth pulses etc.), or 1
+otherwise. Run *tap2sna.py* with the ``--tape-analysis`` option to see the
+timings and EAR bit readings of the pulses on a tape.
 
 The ``accelerator`` parameter must be either a comma-separated list of specific
 accelerator names or one of the following special values:

sphinx/source/man/tap2sna.py.rst

@@ -129,7 +129,7 @@ parameters are:
   simulation as soon as that address is reached, regardless of whether the tape
   has finished (``0``, the default)
 * ``first-edge`` - the time (in T-states) from the start of the tape at which
-  to place the leading edge of the first pulse (default: ``-2168``)
+  to place the leading edge of the first pulse (default: ``0``)
 * ``load`` - a space-separated list of keys to press to build an alternative
   command line to load the tape (see below)
 * ``machine`` - the type of machine to simulate: a 48K Spectrum (``48``, the
@@ -143,14 +143,11 @@ parameters are:
 * ``trace`` - the file to which to log all instructions executed during the
   simulated LOAD (default: none)
 
-The default value of the ``first-edge`` parameter (-2168) places the edge
-between the first and second pulses on the tape at time 0. Any pulses that
-occur before time 0 are discarded. The EAR bit reading yielded by a pulse is 0
-if the 0-based index of the pulse is even (i.e. first, third, fifth pulses
-etc.), or 1 otherwise. Some loaders require ``first-edge=0``, which effectively
-reverses the polarity of every pulse on the tape. Run ``tap2sna.py`` with the
-``--tape-analysis`` option to see the timings and EAR bit readings of the
-pulses on a tape.
+If ``first-edge`` is set to a negative number, any pulses that occur before
+time 0 are discarded. The EAR bit reading yielded by a pulse is 0 if the
+0-based index of the pulse is even (i.e. first, third, fifth pulses etc.), or 1
+otherwise. Run ``tap2sna.py`` with the ``--tape-analysis`` option to see the
+timings and EAR bit readings of the pulses on a tape.
 
 The ``accelerator`` parameter must be either a comma-separated list of specific
 accelerator names or one of the following special values: