diff --git a/H316/h316_cpu.c b/H316/h316_cpu.c
index 16f53628..2caa42b9 100644
--- a/H316/h316_cpu.c
+++ b/H316/h316_cpu.c
@@ -296,8 +296,6 @@ int32 hst_p = 0;                                        /* history pointer */
 int32 hst_lnt = 0;                                      /* history length */
 InstHistory *hst = NULL;                                /* instruction history */
 
-extern DEVICE *sim_devices[];
-
 t_bool devtab_init (void);
 int32 dmaio (int32 inst, int32 fnc, int32 dat, int32 dev);
 int32 undio (int32 inst, int32 fnc, int32 dat, int32 dev);
diff --git a/PDP11/pdp11_rq.c b/PDP11/pdp11_rq.c
index 92f2aa70..252b8853 100644
--- a/PDP11/pdp11_rq.c
+++ b/PDP11/pdp11_rq.c
@@ -258,7 +258,7 @@ struct rqpkt {
    RD52 17      8       512     8       1       4*8     60480
    RD32 17      6       820     6       1       4*8     83204
 x  RD33 17      7       1170    ?       ?       ?       138565
-   RD53 17      7       1024    7       1       5*8     138672
+   RD53 17      8       1024    8       1       5*8     138672
    RD54 17      15      1225    15      1       7*8     311200
 
    The simulator also supports larger drives that only existed
diff --git a/VAX/vax730_defs.h b/VAX/vax730_defs.h
index 4ee98617..9864c442 100644
--- a/VAX/vax730_defs.h
+++ b/VAX/vax730_defs.h
@@ -339,7 +339,6 @@ typedef struct {
 #define BOOT_RL         2                               /* for VMB */
 #define BOOT_RB         3
 #define BOOT_UDA        17
-#define BOOT_TK         18
 #define BOOT_TD         64
 
 /* Function prototypes for I/O */
diff --git a/VAX/vax730_sys.c b/VAX/vax730_sys.c
index 74f68d73..6ec126a6 100644
--- a/VAX/vax730_sys.c
+++ b/VAX/vax730_sys.c
@@ -63,7 +63,6 @@ static struct boot_dev boot_tab[] = {
     { "RQB", BOOT_UDA, 1 << 24 },
     { "RQC", BOOT_UDA, 1 << 24 },
     { "RQD", BOOT_UDA, 1 << 24 },
-    { "TQ", BOOT_TK, 1 << 24 },
     { "TD", BOOT_TD, 0 },
     { "RB", BOOT_RB, 0 },
     { NULL }
diff --git a/VAX/vax750_cmi.c b/VAX/vax750_cmi.c
index 03487f9d..f20e6faa 100644
--- a/VAX/vax750_cmi.c
+++ b/VAX/vax750_cmi.c
@@ -84,7 +84,6 @@ static struct boot_dev boot_tab[] = {
     { "RQB", BOOT_UDA, 1 << 24 },
     { "RQC", BOOT_UDA, 1 << 24 },
     { "RQD", BOOT_UDA, 1 << 24 },
-    { "TQ", BOOT_TK, 1 << 24 },
     { "TD", BOOT_TD, 0 },
     { NULL }
     };
diff --git a/VAX/vax750_defs.h b/VAX/vax750_defs.h
index 75893301..85c2672f 100644
--- a/VAX/vax750_defs.h
+++ b/VAX/vax750_defs.h
@@ -384,7 +384,6 @@ typedef struct {
 #define BOOT_HK         1                               /* for VMB */
 #define BOOT_RL         2
 #define BOOT_UDA        17
-#define BOOT_TK         18
 #define BOOT_CI         32
 #define BOOT_TD         64
 
diff --git a/VAX/vax780_defs.h b/VAX/vax780_defs.h
index 1d093971..dd66e875 100644
--- a/VAX/vax780_defs.h
+++ b/VAX/vax780_defs.h
@@ -1,6 +1,6 @@
 /* vax780_defs.h: VAX 780 model-specific definitions file
 
-   Copyright (c) 2004-2013, Robert M Supnik
+   Copyright (c) 2004-2015, Robert M Supnik
 
    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
@@ -23,6 +23,9 @@
    used in advertising or otherwise to promote the sale, use or other dealings
    in this Software without prior written authorization from Robert M Supnik.
 
+   29-Mar-15    RMS     Added model specific IPR max
+   16-Dec-14    RMS     Removed TQ boot code (780 VMB doesn't support tape boot)
+   05-Sep-14    RMS     Fixed SBR test (found by Mark Pizzolato)
    29-Nov-13    RMS     Added system-specific unaligned routines
    12-Dec-12    RMS     Fixed IO base address for RQB, RQC, RQD
    05-Nov-11    RMS     Added VEC_QMODE definition
@@ -398,7 +401,6 @@ typedef struct {
 #define BOOT_HK         1                               /* for VMB */
 #define BOOT_RL         2
 #define BOOT_UDA        17
-#define BOOT_TK         18
 #define BOOT_CS         64
 
 /* Function prototypes for I/O */
diff --git a/VAX/vax780_sbi.c b/VAX/vax780_sbi.c
index f88108c3..1595ffc5 100644
--- a/VAX/vax780_sbi.c
+++ b/VAX/vax780_sbi.c
@@ -1,6 +1,6 @@
 /* vax780_sbi.c: VAX 11/780 SBI
 
-   Copyright (c) 2004-2011, Robert M Supnik
+   Copyright (c) 2004-2015, Robert M Supnik
 
    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
@@ -27,7 +27,9 @@
 
    sbi                  bus controller
 
-   21-Mar-2011  RMS     Added autoreboot capability (Mark Pizzalato)
+   29-Mar-2015  RMS     Added in-exception test to machine check
+   16-Dec-2014  RMS     Removed TQ boot entry (VMB doesn't support tape boot)
+   21-Mar-2011  RMS     Added autoreboot capability (Mark Pizzolato)
    04-Feb-2011  MP      Added RQB, RQC, and RQD as bootable controllers
    31-May-2008  RMS     Fixed machine_check calling sequence (Peter Schorn)
    03-May-2006  RMS     Fixed writes to ACCS
@@ -122,7 +124,6 @@ static struct boot_dev boot_tab[] = {
     { "RQB", BOOT_UDA, 1 << 24 },
     { "RQC", BOOT_UDA, 1 << 24 },
     { "RQD", BOOT_UDA, 1 << 24 },
-    { "TQ", BOOT_TK, 1 << 24 },
     { "CS", BOOT_CS, 0 },
     { NULL }
     };
diff --git a/VAX/vax860_abus.c b/VAX/vax860_abus.c
index 55fd9e71..feced082 100644
--- a/VAX/vax860_abus.c
+++ b/VAX/vax860_abus.c
@@ -103,7 +103,6 @@ static struct boot_dev boot_tab[] = {
     { "RQB", BOOT_UDA, 1 << 24 },
     { "RQC", BOOT_UDA, 1 << 24 },
     { "RQD", BOOT_UDA, 1 << 24 },
-    { "TQ", BOOT_TK, 1 << 24 },
     { "CS", BOOT_CS, 0 },
     { NULL }
     };
diff --git a/VAX/vax860_defs.h b/VAX/vax860_defs.h
index 96849184..3d432d69 100644
--- a/VAX/vax860_defs.h
+++ b/VAX/vax860_defs.h
@@ -431,7 +431,6 @@ typedef struct {
 #define BOOT_HK         1                               /* for VMB */
 #define BOOT_RL         2
 #define BOOT_UDA        17
-#define BOOT_TK         18
 #define BOOT_CS         64
 
 /* Function prototypes for I/O */