The recent discovery1,2 of a 3-millisecond pulsar in the globular cluster M28 (NGC6626) suggests that a few per cent of type I super novae (of which there are several subcategories, all associated with old stellar populations) form neutron stars. If the contact-binary white dwarf model for type Is is invoked3, it seems probable that millisecond pulsars of low magnetic field would be formed in binary systems which might survive the supernova event.