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Here is an example of mcphas.ini, the comments describe the meaning of the different parameters:
#<!--mcphase.mcphas.ini-->
[MCPHASE RUNTIME CONTROL]
# to stop program set exit to 1
exit=0
# to hold program set pause to 1
pause=0
# to display all structures while iterating set displayall to 1
# (mind that by using this option mcphas gets very slow)
displayall=0
# to create a logfile of the propagation versus free energy set logfevsQ to 1
# (mind this uses a lot of disc space)
logfevsQ=0
[XY PHASEDIAGRAM PARAMETERS]
# xy phasediagram axes - parameters
# structures are calculated in the xy - phasediagram
# the direction of x and y can be chosen:
# vector in (H-T) space corresponding to x axis (xT [K] xHa [T] xHb [T] xHc [T])
xT=1
xHa=0
xHb=0
xHc=0
# range of x
xmin=2
xmax=8
xstep=0.2
# vector in (H-T) space corresponding to y axis (yT [K] yHa [T] yHb [T] yHc [T])
yT=0
yHa=0
yHb=1
yHc=0
# range of y
ymin=0
ymax=4
ystep=0.2
# offset
T0=0
Ha0=0
Hb0=0
Hc0=0
[GENERATION OF SPIN CONFIGURATIONS]
# test q vector (qmin qmax deltaq)
hmin=0
hmax=0
deltah=0.05
kmin=0
kmax=0
deltak=0.05
lmin=0
lmax=1
deltal=0.02
# maximal periodicity of spinconfigurations generated by q vectors
maxqperiod=30
# maximal number of test spinconfigurations
maxnoftestspincf=1000
# maximal number of spins in spinconfigurations generated by q vectors
maxnofspins=270
# number of random (Monte Carlo) spin inversions to try for each initial spinconfiguration
nofrndtries=5
[PARAMETERS FOR SUB FECALC SELFCONSISTENCY PROCESS]
# (optional) number of parallel threads on your machine
# (if not set program will attempt to determine this automatically)
# nofthreads=2
# maximum number of selfconsistency loops
maxnofmfloops=1000
# standard deviation - limit to end selfconsistency process
# standard deviation is defined by ...sta=sqrt(sum_{i=1}^{n} (newmf-old mf)i^2/n)
# the meanfield is given by mf=gj mb H [meV] (gj...lande factor, mb... bohr magneton)
maxstamf=1e-05
# step ratio (bigstep=actual step/calculated step) to perform actually
# (in case the sta increases in subsequent steps the program steps only
# smallstep=0.2xbigstep for ten steps and then again with bigstep
# if bigstep is set >1, then only the digits after the comma are relevant
# the digits before the comma give the ratio of bigstep/smallstep
bigstep=1
# sum_{i=1}^{n} abs(actual change of angular momentum <Ji> with respect to
# initial configuration) > maxspinchange will end selfconsistency process
maxspinchange=60
[OUTPUT OF PHYSICAL PROPERTIES]
# output of physical properties to compare with experiment
# 1. For thermal expansion and magnetostriction
# how many spinspin correlation functions
# should be calculated
nofspincorrs=2
# 2. For Neutron Diffraction
# calculation of mxnofhkl strongest reflections
maxnofhkls=10
# maximum scattering vector |Q|[1/A] for calculated hkl's
maxQ=1