ngspice-21.pdf ngspice-rework-20.cvs20100719.tar.bz2 /ngspice-rework-22.cvs20101113.tar.bz2 /ngspice-23.tar.gz /ngspice23-manual.pdf /ngspice-26.tar.gz /ngspice-26-manual.pdf /ngspice-27.tar.gz /ngspice-27-manual.pdf