AMBER Archive (2000)

Subject: frcmod file format in amber 6.0

From: Mathy Froeyen (Matheus.Froeyen_at_rega.kuleuven.ac.be)
Date: Wed Dec 13 2000 - 03:01:04 CST

Dear Amber Users,

I am moving from Amber 4.1 to 6.0.

I am confused about the frcmod file which allows to modify the force
field parameters.
In Amber 4.1 this was done via the parm program. The parm documentation
gives a description of the
frcmod file format which differs from the parm9x.dat files (for instance
the keywords MASS, BOND, ...)

In amber 6.0 both parm94.dat and frcmod files are loaded via the same
leap command

parm94 = loadamberparams parm94.dat
frcmod = loadamberparams frcmod.pcy

(see tutorial p 22)

but the format of both files seems to be different.

I do not find the format of the frcmod files in the amber 6.0
documentation.
Can I use the format of a parm9x.dat file to modify the parameters ?

thanks a lot for your help
mathy froeyen