A medium-energy synchrotron capable of accelerating all ion species based on a novel technology of the induction synchrotron has been proposed as an all-ion accelerator (AIA). The AIA without any specific injector employs a strong focusing lattice for ion-beam guiding and induction acceleration cells for acceleration and longitudinal capture, which are driven by a novel switching power supply. All ions, including cluster ions in their possible and arbitrary charge state, are accelerated in a single accelerator. A plan to modify the existing KEK 500MeV Booster synchrotron to the AIA is under consideration. Important aspects in a 200 kV ion source, and specific features in the orbit correction associated with the low-field injection and induction acceleration, are described.