  We study dilepton production from pp, pd and p Be collisions from 1 - 5 GeV
including the $\pi^0$, $\eta$, $\omega$ and $\Delta$ Dalitz decays, direct
decays of vector mesons ($\rho$, $\omega$) as well as subthreshold $\rho$
production via baryonic resonances (e.g. $D_{13}(1520), P_{11}(1710)$). Our
calculations compare rather well with the pp and pd data from the DLS
Collaboration, however, overestimate slightly the 'old' p Be data from that
group. Futhermore, detailed predictions for differential dilepton spectra at
SIS energies are made with a high mass resolution that can be controlled
experimentally by the HADES Collaboration in near future.
