We construct D-brane states on an asymmetric orbifold of type IIA on a four
-torus, which is modded out by T-duality. We find explicit boundary states
charged under the twisted sector gauge fields. Unlike other cases, the boun
dary states involve an explicit dependence on the twist fields. The D-brane
spectrum is consistent with the model being equivalent to type IIA on a fo
ur-torus. (C) 1999 Elsevier Science B.V. All rights reserved.