diff --git a/PDP10/ka10_dp.c b/PDP10/ka10_dp.c
index c101cc6..4888b14 100644
--- a/PDP10/ka10_dp.c
+++ b/PDP10/ka10_dp.c
@@ -544,30 +544,35 @@ t_stat dp_svc (UNIT *uptr)
                 uptr->STATUS |= SRC_DONE;
                 if (uptr->STATUS & END_CYL) {
                      uptr->UFLAGS |= DONE;
+                     uptr->STATUS &= ~BUSY;
                      df10_finish_op(df10, 0);
                      return SCPE_OK;
                 }  
                 if (sect >= dp_drv_tab[dtype].sect) {
                      uptr->UFLAGS |= DONE;
+                     uptr->STATUS &= ~BUSY;
                      uptr->STATUS |= SEC_ERR;
                      df10_finish_op(df10, 0);
                      return SCPE_OK;
                 }
                 if (surf >= dp_drv_tab[dtype].surf) {
                      uptr->UFLAGS |= DONE;
+                     uptr->STATUS &= ~BUSY;
                      uptr->STATUS |= SUF_ERR;
                      df10_finish_op(df10, 0);
                      return SCPE_OK;
                 }
                 if (cyl != uptr->CUR_CYL) {
                      uptr->UFLAGS |= DONE;
+                     uptr->STATUS &= ~BUSY;
                      uptr->STATUS |= SRC_ERR;
                      df10_finish_op(df10, 0);
                      return SCPE_OK;
                 }
                 if ((uptr->STATUS & BUSY) == 0) {
-                    df10_finish_op(df10, 0);
-                    return SCPE_OK;
+                     uptr->STATUS &= ~BUSY;
+                     df10_finish_op(df10, 0);
+                     return SCPE_OK;
                 }
                 if (cmd != WR) {
                     /* Read the block */
diff --git a/PDP10/ka10_mt.c b/PDP10/ka10_mt.c
index f8cc8d4..1bae466 100644
--- a/PDP10/ka10_mt.c
+++ b/PDP10/ka10_mt.c
@@ -523,6 +523,7 @@ t_stat mt_srv(UNIT * uptr)
             if ((r = sim_tape_rdrecf(uptr, &mt_buffer[0], &reclen, 
                                 BUFFSIZE)) != MTSE_OK) {
                 sim_debug(DEBUG_DETAIL, dptr, "MT%o read error %d\n", unit, r);
+                uptr->u3 &= ~MT_MOTION;
                 return mt_error(uptr, r, dptr);
             }
             sim_debug(DEBUG_DETAIL, dptr, "MT%o read %d\n", unit, reclen);
@@ -582,6 +583,7 @@ t_stat mt_srv(UNIT * uptr)
              if ((r = sim_tape_rdrecf(uptr, &mt_buffer[0], &reclen, 
                                  BUFFSIZE)) != MTSE_OK) {
                  sim_debug(DEBUG_DETAIL, dptr, "MT%o read error %d\n", unit, r);
+                 uptr->u3 &= ~MT_MOTION;
                  return mt_error(uptr, r, dptr);
              }
              sim_debug(DEBUG_DETAIL, dptr, "MT%o compare %d\n", unit, reclen);