diff --git a/PDP11/pdp11_dmc.c b/PDP11/pdp11_dmc.c
index 56f6a006..2f91d6ec 100644
--- a/PDP11/pdp11_dmc.c
+++ b/PDP11/pdp11_dmc.c
@@ -2309,18 +2309,12 @@ while ((control = controller->control_out)) {
 controller->control_out = NULL;
 dmc_setreg(controller, 0, 0, DBG_RGC);
 if (controller->dev_type == DMR) {
-    if (dmc_is_attached(controller->unit)) {
-        /* Indicates microdiagnostics complete */
-        if (((*controller->csrs->sel0 & DMC_SEL0_M_UDIAG) != 0) ^
-            (dmc_microdiag[controller->index]))
-            dmc_setreg(controller, 2, 0x8000, DBG_RGC);/* Microdiagnostics Complete */
-        else
-            dmc_setreg(controller, 2, 0x4000, DBG_RGC); /* Microdiagnostics Inhibited */
-        }
-    else {
-        /* Indicate M8203 (Line Unit) test failed */
-        dmc_setreg(controller, 2, 0x0200, DBG_RGC);
-        }
+    /* Indicates microdiagnostics complete */
+    if (((*controller->csrs->sel0 & DMC_SEL0_M_UDIAG) != 0) ^
+        (dmc_microdiag[controller->index]))
+        dmc_setreg(controller, 2, 0x8000, DBG_RGC);/* Microdiagnostics Complete */
+    else
+        dmc_setreg(controller, 2, 0x4000, DBG_RGC); /* Microdiagnostics Inhibited */
     }
 else {
     /* preserve contents of BSEL3 if DMC-11 */