diff --git a/IBM360/ibm360_con.c b/IBM360/ibm360_con.c
index b8a2cd0..dc891ad 100644
--- a/IBM360/ibm360_con.c
+++ b/IBM360/ibm360_con.c
@@ -103,7 +103,7 @@ struct dib con_dib = { 0xFF, 1, NULL, con_startcmd, con_haltio, con_unit, con_in
 DEVICE              con_dev = {
     "INQ", con_unit, NULL, con_mod,
     NUM_DEVS_CON, 8, 15, 1, 8, 8,
-    NULL, NULL, NULL, NULL, NULL, con_detach,
+    NULL, NULL, NULL, NULL, NULL, &con_detach,
     &con_dib, DEV_UADDR | DEV_DISABLE | DEV_DEBUG, 0, dev_debug,
     NULL, NULL, &con_help, NULL, NULL, &con_description
 };
diff --git a/IBM360/ibm360_cpu.c b/IBM360/ibm360_cpu.c
index 96156c7..ef08bb3 100644
--- a/IBM360/ibm360_cpu.c
+++ b/IBM360/ibm360_cpu.c
@@ -1761,12 +1761,17 @@ set_cc:
                 dest = src1 + src2;
                 if ((((src1 & src2 & ~dest) |
                        (~src1 & ~src2 & dest)) & MSIGN) != 0) {
+                    if ((op & 0x1f) == 0x1b && src1 == MSIGN && src2 == MSIGN) {
+                        dest = 0;
+                        goto set_cc;
+                    }
 set_cc3:
                     regs[reg1] = dest;
                     per_mod |= 1 << reg1;
                     cc = 3;
-                    if (pmsk & FIXOVR)
+                    if (pmsk & FIXOVR) {
                        storepsw(OPPSW, IRC_FIXOVR);
+                    }
                     break;
                 }
                 goto set_cc;
@@ -2185,8 +2190,9 @@ save_dbl:
                    if (cc != 3 && (src1 | src1h) != 0)
                       cc = (src1 & MSIGN) ? 1 : 2;
 #endif
-                   if (cc == 3 && (pmsk & FIXOVR))
+                   if (cc == 3 && (pmsk & FIXOVR)) {
                       storepsw(OPPSW, IRC_FIXOVR);
+                   }
                    dest = regs[reg1];
                 }
                 break;
diff --git a/IBM360/ibm360_dasd.c b/IBM360/ibm360_dasd.c
index 2c96bfa..4867fc3 100644
--- a/IBM360/ibm360_dasd.c
+++ b/IBM360/ibm360_dasd.c
@@ -941,7 +941,7 @@ sense_end:
              if ((uptr->CCH >> 8) == data->cyl) {
                  uptr->LCMD = cmd;
                  uptr->CMD &= ~(0xff);
-                 set_devattn(addr, SNS_CHNEND | SNS_DEVEND);
+                 set_devattn(addr, SNS_DEVEND);
                  sim_debug(DEBUG_DETAIL, dptr, "seek end unit=%d %d %d %x\n", unit,
                       uptr->CCH >> 8, data->cyl, data->state);
               }