... Create a text file named INPUT in the current directory that looks something like this (note all input keywords starting with $ sign are preceeded by a single blank character at the beginning of each line!): $contrl scftyp=RHF runtyp= ENERGY mplevl=2 units=ANGS icharg=0 mult=1 $ end $system timlim=30 memory=500000 $ end $basis gbasis=N31 ngauss=6 ndfunc=1 nffunc=0 npfunc=1 diffsp=.TRUE. $ end $guess guess=huckel $ ... Download Firefly sample input files . ... PC GAMESS version 5.2. ...