diff --git a/PDP10/pdp10_defs.h b/PDP10/pdp10_defs.h
index 4450232e..c876cc91 100644
--- a/PDP10/pdp10_defs.h
+++ b/PDP10/pdp10_defs.h
@@ -657,8 +657,6 @@ typedef struct pdp_dib DIB;
 #define IOBA_RP         (IO_UBA1 + 0776700)             /* RH11/disk */
 #define IOLN_RP         050
 
-#define IOBA_DZ         (IO_UBA3 + 0760010)             /* DZ11 */
-#define IOLN_DZ         010
 #define IOBA_TCU        (IO_UBA3 + 0760770)             /* TCU150 */
 #define IOLN_TCU        006
 #define IOBA_UBMAP3     (IO_UBA3 + IOBA_UBMAP)          /* Unibus 3 map */
@@ -667,20 +665,10 @@ typedef struct pdp_dib DIB;
 #define IOLN_UBCS3      001
 #define IOBA_UBMNT3     (IO_UBA3 + 0763101)             /* Unibus 3 maint reg */
 #define IOLN_UBMNT3     001
-#define IOBA_XU         (IO_UBA3 + 0774510)             /* DEUNA/DELUA */
-#define IOLN_XU         010
-#define IOBA_CR         (IO_UBA3 + 0777160)             /* CD/CR/CM */
-#define IOLN_CR         010
-#define IOBA_RY         (IO_UBA3 + 0777170)             /* RX211 */
-#define IOLN_RY         004
 #define IOBA_TU         (IO_UBA3 + 0772440)             /* RH11/tape */
 #define IOLN_TU         034
 #define IOBA_LP20       (IO_UBA3 + 0775400)             /* LP20 */
 #define IOLN_LP20       020
-#define IOBA_PTR        (IO_UBA3 + 017550)              /* PC11 reader */
-#define IOLN_PTR        004
-#define IOBA_PTP        (IO_UBA3 + 017554)              /* PC11 punch */
-#define IOLN_PTP        004
 #define IOBA_AUTO       0                               /* Set by Auto Configure */
 
 /* Common Unibus CSR flags */
@@ -709,8 +697,8 @@ typedef struct pdp_dib DIB;
 #define INT_V_TU        7                               /* RH11/TM03/TU45 */
 #define INT_V_KMCA      8                               /* KMC11 */
 #define INT_V_KMCB      9
-#define INT_V_DMCRX     8                               /* DMC11/DMR11 */
-#define INT_V_DMCTX     9
+#define INT_V_DMCRX     10                              /* DMC11/DMR11 */
+#define INT_V_DMCTX     11
 #define INT_V_DZRX      16                              /* DZ11 */
 #define INT_V_DZTX      17
 #define INT_V_RY        18                              /* RX211 */
@@ -742,7 +730,8 @@ typedef struct pdp_dib DIB;
 #define IPL_TU          6
 #define IPL_KMCA        5
 #define IPL_KMCB        5
-#define IPL_XU          5
+#define IPL_DMCRX       5
+#define IPL_DMCTX       5
 #define IPL_DZRX        5
 #define IPL_DZTX        5
 #define IPL_RY          5
@@ -762,13 +751,8 @@ typedef struct pdp_dib DIB;
 #define INT_IPL4        0x7FF00000
 
 #define VEC_Q           0000                            /* vector base */
-#define VEC_PTR         0070                            /* interrupt vectors */
-#define VEC_PTP         0074
-#define VEC_XU          0120
-#define VEC_TU          0224
-#define VEC_CR          0230
+#define VEC_TU          0224                            /* interrupt vectors */
 #define VEC_RP          0254
-#define VEC_RY          0264
 #define VEC_LP20        0754
 #define VEC_AUTO        0                               /* Set by Auto Configure */