diff --git a/VAX/vax610_stddev.c b/VAX/vax610_stddev.c
index 59cfe468..afb2e80e 100644
--- a/VAX/vax610_stddev.c
+++ b/VAX/vax610_stddev.c
@@ -91,6 +91,8 @@ t_stat clk_reset (DEVICE *dptr);
 char *tti_description (DEVICE *dptr);
 char *tto_description (DEVICE *dptr);
 char *clk_description (DEVICE *dptr);
+t_stat tti_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
+t_stat tto_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
 void txdb_func (int32 data);
 
 extern int32 sysd_hlt_enb (void);
@@ -131,7 +133,7 @@ DEVICE tti_dev = {
     1, 10, 31, 1, 16, 8,
     NULL, NULL, &tti_reset,
     NULL, NULL, NULL,
-    &tti_dib, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, 
+    &tti_dib, 0, 0, NULL, NULL, NULL, &tti_help, NULL, NULL, 
     &tti_description
     };
 
@@ -171,7 +173,7 @@ DEVICE tto_dev = {
     1, 10, 31, 1, 16, 8,
     NULL, NULL, &tto_reset,
     NULL, NULL, NULL,
-    &tto_dib, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, 
+    &tto_dib, 0, 0, NULL, NULL, NULL, &tto_help, NULL, NULL, 
     &tto_description
     };
 
@@ -363,6 +365,16 @@ sim_activate_abs (&tti_unit, KBD_WAIT (tti_unit.wait, tmr_poll));
 return SCPE_OK;
 }
 
+t_stat tti_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
+{
+fprintf (st, "Console Terminal Input (TTI)\n\n");
+fprintf (st, "The terminal input (TTI) polls the console keyboard for input.\n\n");
+fprint_set_help (st, dptr);
+fprint_show_help (st, dptr);
+fprint_reg_help (st, dptr);
+return SCPE_OK;
+}
+
 char *tti_description (DEVICE *dptr)
 {
 return "console terminal input";
@@ -402,6 +414,16 @@ sim_cancel (&tto_unit);                                 /* deactivate unit */
 return SCPE_OK;
 }
 
+t_stat tto_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
+{
+fprintf (st, "Console Terminal Output (TTO)\n\n");
+fprintf (st, "The terminal output (TTO) writes to the simulator console.\n\n");
+fprint_set_help (st, dptr);
+fprint_show_help (st, dptr);
+fprint_reg_help (st, dptr);
+return SCPE_OK;
+}
+
 char *tto_description (DEVICE *dptr)
 {
 return "console terminal output";
diff --git a/VAX/vax630_stddev.c b/VAX/vax630_stddev.c
index e3b70565..6cda6973 100644
--- a/VAX/vax630_stddev.c
+++ b/VAX/vax630_stddev.c
@@ -68,6 +68,8 @@ t_stat clk_reset (DEVICE *dptr);
 char *tti_description (DEVICE *dptr);
 char *tto_description (DEVICE *dptr);
 char *clk_description (DEVICE *dptr);
+t_stat tti_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
+t_stat tto_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
 
 extern int32 sysd_hlt_enb (void);
 
@@ -106,7 +108,7 @@ DEVICE tti_dev = {
     1, 10, 31, 1, 16, 8,
     NULL, NULL, &tti_reset,
     NULL, NULL, NULL,
-    &tti_dib, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, 
+    &tti_dib, 0, 0, NULL, NULL, NULL, &tti_help, NULL, NULL, 
     &tti_description
     };
 
@@ -146,7 +148,7 @@ DEVICE tto_dev = {
     1, 10, 31, 1, 16, 8,
     NULL, NULL, &tto_reset,
     NULL, NULL, NULL,
-    &tto_dib, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, 
+    &tto_dib, 0, 0, NULL, NULL, NULL, &tto_help, NULL, NULL, 
     &tto_description
     };
 
@@ -298,6 +300,21 @@ sim_activate_abs (&tti_unit, KBD_WAIT (tti_unit.wait, tmr_poll));
 return SCPE_OK;
 }
 
+t_stat tti_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
+{
+fprintf (st, "Console Terminal Input (TTI)\n\n");
+fprintf (st, "The terminal input (TTI) polls the console keyboard for input.\n\n");
+fprintf (st, "When the console terminal is attached to a Telnet session or the simulator is\n");
+fprintf (st, "running from a Windows command prompt, it recognizes BREAK.  If BREAK is\n");
+fprintf (st, "entered, and BDR<7> is set (also known as SET CPU NOAUTOBOOT), control returns\n");
+fprintf (st, "to the console firmware; otherwise, BREAK is treated as a normal terminal\n");
+fprintf (st, "input condition.\n\n");
+fprint_set_help (st, dptr);
+fprint_show_help (st, dptr);
+fprint_reg_help (st, dptr);
+return SCPE_OK;
+}
+
 char *tti_description (DEVICE *dptr)
 {
 return "console terminal input";
@@ -337,6 +354,16 @@ sim_cancel (&tto_unit);                                 /* deactivate unit */
 return SCPE_OK;
 }
 
+t_stat tto_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
+{
+fprintf (st, "Console Terminal Output (TTO)\n\n");
+fprintf (st, "The terminal output (TTO) writes to the simulator console.\n\n");
+fprint_set_help (st, dptr);
+fprint_show_help (st, dptr);
+fprint_reg_help (st, dptr);
+return SCPE_OK;
+}
+
 char *tto_description (DEVICE *dptr)
 {
 return "console terminal output";
diff --git a/VAX/vax730_stddev.c b/VAX/vax730_stddev.c
index ed53e783..cce81c8a 100644
--- a/VAX/vax730_stddev.c
+++ b/VAX/vax730_stddev.c
@@ -220,6 +220,9 @@ char *tto_description (DEVICE *dptr);
 char *clk_description (DEVICE *dptr);
 char *tmr_description (DEVICE *dptr);
 char *td_description (DEVICE *dptr);
+t_stat tti_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
+t_stat tto_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
+t_stat clk_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
 t_stat clk_attach (UNIT *uptr, char *cptr);
 t_stat clk_detach (UNIT *uptr);
 t_stat tmr_reset (DEVICE *dptr);
@@ -264,7 +267,7 @@ DEVICE tti_dev = {
     1, 10, 31, 1, 16, 8,
     NULL, NULL, &tti_reset,
     NULL, NULL, NULL,
-    NULL, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, 
+    NULL, 0, 0, NULL, NULL, NULL, &tti_help, NULL, NULL, 
     &tti_description
     };
 
@@ -300,7 +303,7 @@ DEVICE tto_dev = {
     1, 10, 31, 1, 16, 8,
     NULL, NULL, &tto_reset,
     NULL, NULL, NULL,
-    NULL, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, 
+    NULL, 0, 0, NULL, NULL, NULL, &tto_help, NULL, NULL, 
     &tto_description
     };
 
@@ -325,7 +328,7 @@ DEVICE clk_dev = {
     1, 0, 8, 4, 0, 32,
     NULL, NULL, &clk_reset,
     NULL, &clk_attach, &clk_detach,
-    NULL, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, 
+    NULL, 0, 0, NULL, NULL, NULL, &clk_help, NULL, NULL, 
     &clk_description
     };
 
@@ -691,6 +694,16 @@ sim_activate_abs (&tti_unit, KBD_WAIT (tti_unit.wait, tmr_poll));
 return SCPE_OK;
 }
 
+t_stat tti_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
+{
+fprintf (st, "Console Terminal Input (TTI)\n\n");
+fprintf (st, "The terminal input (TTI) polls the console keyboard for input.\n\n");
+fprint_set_help (st, dptr);
+fprint_show_help (st, dptr);
+fprint_reg_help (st, dptr);
+return SCPE_OK;
+}
+
 char *tti_description (DEVICE *dptr)
 {
 return "console terminal input";
@@ -729,6 +742,16 @@ sim_cancel (&tto_unit);                                 /* deactivate unit */
 return SCPE_OK;
 }
 
+t_stat tto_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
+{
+fprintf (st, "Console Terminal Output (TTO)\n\n");
+fprintf (st, "The terminal output (TTO) writes to the simulator console.\n\n");
+fprint_set_help (st, dptr);
+fprint_show_help (st, dptr);
+fprint_reg_help (st, dptr);
+return SCPE_OK;
+}
+
 char *tto_description (DEVICE *dptr)
 {
 return "console terminal output";
@@ -896,6 +919,37 @@ if (clk_unit.filebuf == NULL) {                         /* make sure the TODR is
 return SCPE_OK;
 }
 
+t_stat clk_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
+{
+fprintf (st, "Real-Time Clock (CLK)\n\n");
+fprintf (st, "The real-time clock autocalibrates; the clock interval is adjusted up or down\n");
+fprintf (st, "so that the clock tracks actual elapsed time.\n\n");
+fprintf (st, "There are two modes of TODR operation:\n\n");
+fprintf (st, "   Default VMS mode.  Without initializing the TODR it returns the current\n");
+fprintf (st, "                      time of year offset which VMS would set the clock to\n");
+fprintf (st, "                      if VMS knew the correct time (i.e. by manual input).\n");
+fprintf (st, "                      This is correct almost all the time unless a VMS disk\n");
+fprintf (st, "                      hadn't been booted from in the current year.  This mode\n");
+fprintf (st, "                      produces strange time results for non VMS OSes on each\n");
+fprintf (st, "                      system boot.\n");
+fprintf (st, "   OS Agnostic mode.  This mode behaves precisely like the VAX780 TODR and\n");
+fprintf (st, "                      works correctly for all OSes.  This mode is enabled by\n");
+fprintf (st, "                      attaching the CLK to a battery backup state file for the\n");
+fprintf (st, "                      TOY clock (i.e. sim> attach CLK TOY_CLOCK).  When\n");
+fprintf (st, "                      operating in OS Agnostic mode, the TODR will initially\n");
+fprintf (st, "                      start counting from 0 and be adjusted differently when\n");
+fprintf (st, "                      an OS specifically writes to the TODR.  VMS determines\n");
+fprintf (st, "                      if the TODR currently contains a valid time if the value\n");
+fprintf (st, "                      it sees is less than about 1 month.  If the time isn't\n");
+fprintf (st, "                      valid VMS will prompt to set the time during the system\n");
+fprintf (st, "                      boot.  While prompting for the time it will wait for an\n");
+fprintf (st, "                      answer to the prompt for up to the SYSGEN parameter\n");
+fprintf (st, "                      TIMEPROMPTWAIT seconds.  A value of 0 for TIMEPROMPTWAIT\n");
+fprintf (st, "                      will disable the clock setting prompt.\n");
+fprint_reg_help (st, dptr);
+return SCPE_OK;
+}
+
 char *clk_description (DEVICE *dptr)
 {
 return "time of year clock";
diff --git a/VAX/vax750_stddev.c b/VAX/vax750_stddev.c
index 99683e1d..62eca7ae 100644
--- a/VAX/vax750_stddev.c
+++ b/VAX/vax750_stddev.c
@@ -216,6 +216,9 @@ t_stat clk_reset (DEVICE *dptr);
 char *tti_description (DEVICE *dptr);
 char *tto_description (DEVICE *dptr);
 char *clk_description (DEVICE *dptr);
+t_stat tti_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
+t_stat tto_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
+t_stat clk_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
 t_stat clk_attach (UNIT *uptr, char *cptr);
 t_stat clk_detach (UNIT *uptr);
 t_stat tmr_reset (DEVICE *dptr);
@@ -264,7 +267,7 @@ DEVICE tti_dev = {
     1, 10, 31, 1, 16, 8,
     NULL, NULL, &tti_reset,
     NULL, NULL, NULL,
-    NULL, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, 
+    NULL, 0, 0, NULL, NULL, NULL, &tti_help, NULL, NULL, 
     &tti_description
     };
 
@@ -300,7 +303,7 @@ DEVICE tto_dev = {
     1, 10, 31, 1, 16, 8,
     NULL, NULL, &tto_reset,
     NULL, NULL, NULL,
-    NULL, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, 
+    NULL, 0, 0, NULL, NULL, NULL, &tto_help, NULL, NULL, 
     &tto_description
     };
 
@@ -325,7 +328,7 @@ DEVICE clk_dev = {
     1, 0, 8, 4, 0, 32,
     NULL, NULL, &clk_reset,
     NULL, &clk_attach, &clk_detach,
-    NULL, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, 
+    NULL, 0, 0, NULL, NULL, NULL, &clk_help, NULL, NULL, 
     &clk_description
     };
 
@@ -687,6 +690,16 @@ csi_int = 0;
 return SCPE_OK;
 }
 
+t_stat tti_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
+{
+fprintf (st, "Console Terminal Input (TTI)\n\n");
+fprintf (st, "The terminal input (TTI) polls the console keyboard for input.\n\n");
+fprint_set_help (st, dptr);
+fprint_show_help (st, dptr);
+fprint_reg_help (st, dptr);
+return SCPE_OK;
+}
+
 char *tti_description (DEVICE *dptr)
 {
 return "console terminal input";
@@ -726,6 +739,16 @@ sim_cancel (&tto_unit);                                 /* deactivate unit */
 return SCPE_OK;
 }
 
+t_stat tto_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
+{
+fprintf (st, "Console Terminal Output (TTO)\n\n");
+fprintf (st, "The terminal output (TTO) writes to the simulator console.\n\n");
+fprint_set_help (st, dptr);
+fprint_show_help (st, dptr);
+fprint_reg_help (st, dptr);
+return SCPE_OK;
+}
+
 char *tto_description (DEVICE *dptr)
 {
 return "console terminal output";
@@ -893,6 +916,37 @@ if (clk_unit.filebuf == NULL) {                         /* make sure the TODR is
 return SCPE_OK;
 }
 
+t_stat clk_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
+{
+fprintf (st, "Real-Time Clock (CLK)\n\n");
+fprintf (st, "The real-time clock autocalibrates; the clock interval is adjusted up or down\n");
+fprintf (st, "so that the clock tracks actual elapsed time.\n\n");
+fprintf (st, "There are two modes of TODR operation:\n\n");
+fprintf (st, "   Default VMS mode.  Without initializing the TODR it returns the current\n");
+fprintf (st, "                      time of year offset which VMS would set the clock to\n");
+fprintf (st, "                      if VMS knew the correct time (i.e. by manual input).\n");
+fprintf (st, "                      This is correct almost all the time unless a VMS disk\n");
+fprintf (st, "                      hadn't been booted from in the current year.  This mode\n");
+fprintf (st, "                      produces strange time results for non VMS OSes on each\n");
+fprintf (st, "                      system boot.\n");
+fprintf (st, "   OS Agnostic mode.  This mode behaves precisely like the VAX780 TODR and\n");
+fprintf (st, "                      works correctly for all OSes.  This mode is enabled by\n");
+fprintf (st, "                      attaching the CLK to a battery backup state file for the\n");
+fprintf (st, "                      TOY clock (i.e. sim> attach CLK TOY_CLOCK).  When\n");
+fprintf (st, "                      operating in OS Agnostic mode, the TODR will initially\n");
+fprintf (st, "                      start counting from 0 and be adjusted differently when\n");
+fprintf (st, "                      an OS specifically writes to the TODR.  VMS determines\n");
+fprintf (st, "                      if the TODR currently contains a valid time if the value\n");
+fprintf (st, "                      it sees is less than about 1 month.  If the time isn't\n");
+fprintf (st, "                      valid VMS will prompt to set the time during the system\n");
+fprintf (st, "                      boot.  While prompting for the time it will wait for an\n");
+fprintf (st, "                      answer to the prompt for up to the SYSGEN parameter\n");
+fprintf (st, "                      TIMEPROMPTWAIT seconds.  A value of 0 for TIMEPROMPTWAIT\n");
+fprintf (st, "                      will disable the clock setting prompt.\n");
+fprint_reg_help (st, dptr);
+return SCPE_OK;
+}
+
 char *clk_description (DEVICE *dptr)
 {
 return "time of year clock";
diff --git a/VAX/vax780_stddev.c b/VAX/vax780_stddev.c
index 77324d18..c1c1dc14 100644
--- a/VAX/vax780_stddev.c
+++ b/VAX/vax780_stddev.c
@@ -234,6 +234,9 @@ char *tto_description (DEVICE *dptr);
 char *clk_description (DEVICE *dptr);
 char *tmr_description (DEVICE *dptr);
 char *fl_description (DEVICE *dptr);
+t_stat tti_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
+t_stat tto_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
+t_stat clk_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
 t_stat clk_attach (UNIT *uptr, char *cptr);
 t_stat clk_detach (UNIT *uptr);
 t_stat tmr_reset (DEVICE *dptr);
@@ -280,7 +283,7 @@ DEVICE tti_dev = {
     1, 10, 31, 1, 16, 8,
     NULL, NULL, &tti_reset,
     NULL, NULL, NULL,
-    NULL, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, 
+    NULL, 0, 0, NULL, NULL, NULL, &tti_help, NULL, NULL, 
     &tti_description
     };
 
@@ -307,7 +310,7 @@ REG tto_reg[] = {
 MTAB tto_mod[] = {
     { TT_MODE,  TT_MODE_7B, "7b", "7B",     NULL, NULL,      NULL, "Set 7 bit mode" },
     { TT_MODE,  TT_MODE_8B, "8b", "8B",     NULL, NULL,      NULL, "Set 8 bit mode" },
-    { TT_MODE,  TT_MODE_7P, "7p", "7P",     NULL, NULL,      NULL, "Set 7 bit mode (suppress non printing)" },
+    { TT_MODE,  TT_MODE_7P, "7p", "7P",     NULL, NULL,      NULL, "Set 7 bit mode (suppress non printing output)" },
     { 0 }
     };
 
@@ -316,7 +319,7 @@ DEVICE tto_dev = {
     1, 10, 31, 1, 16, 8,
     NULL, NULL, &tto_reset,
     NULL, NULL, NULL,
-    NULL, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, 
+    NULL, 0, 0, NULL, NULL, NULL, &tto_help, NULL, NULL, 
     &tto_description
     };
 
@@ -341,7 +344,7 @@ DEVICE clk_dev = {
     1, 0, 8, 4, 0, 32,
     NULL, NULL, &clk_reset,
     NULL, &clk_attach, &clk_detach,
-    NULL, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, 
+    NULL, 0, 0, NULL, NULL, NULL, &clk_help, NULL, NULL, 
     &clk_description
     };
 
@@ -504,6 +507,16 @@ sim_activate (&tti_unit, KBD_WAIT (tti_unit.wait, tmr_poll));
 return SCPE_OK;
 }
 
+t_stat tti_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
+{
+fprintf (st, "Console Terminal Input (TTI)\n\n");
+fprintf (st, "The terminal input (TTI) polls the console keyboard for input.\n\n");
+fprint_set_help (st, dptr);
+fprint_show_help (st, dptr);
+fprint_reg_help (st, dptr);
+return SCPE_OK;
+}
+
 char *tti_description (DEVICE *dptr)
 {
 return "console terminal input";
@@ -543,6 +556,16 @@ sim_cancel (&tto_unit);                                 /* deactivate unit */
 return SCPE_OK;
 }
 
+t_stat tto_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
+{
+fprintf (st, "Console Terminal Output (TTO)\n\n");
+fprintf (st, "The terminal output (TTO) writes to the simulator console.\n\n");
+fprint_set_help (st, dptr);
+fprint_show_help (st, dptr);
+fprint_reg_help (st, dptr);
+return SCPE_OK;
+}
+
 char *tto_description (DEVICE *dptr)
 {
 return "console terminal output";
@@ -710,6 +733,37 @@ if (clk_unit.filebuf == NULL) {                         /* make sure the TODR is
 return SCPE_OK;
 }
 
+t_stat clk_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
+{
+fprintf (st, "Real-Time Clock (CLK)\n\n");
+fprintf (st, "The real-time clock autocalibrates; the clock interval is adjusted up or down\n");
+fprintf (st, "so that the clock tracks actual elapsed time.\n\n");
+fprintf (st, "There are two modes of TODR operation:\n\n");
+fprintf (st, "   Default VMS mode.  Without initializing the TODR it returns the current\n");
+fprintf (st, "                      time of year offset which VMS would set the clock to\n");
+fprintf (st, "                      if VMS knew the correct time (i.e. by manual input).\n");
+fprintf (st, "                      This is correct almost all the time unless a VMS disk\n");
+fprintf (st, "                      hadn't been booted from in the current year.  This mode\n");
+fprintf (st, "                      produces strange time results for non VMS OSes on each\n");
+fprintf (st, "                      system boot.\n");
+fprintf (st, "   OS Agnostic mode.  This mode behaves precisely like the VAX780 TODR and\n");
+fprintf (st, "                      works correctly for all OSes.  This mode is enabled by\n");
+fprintf (st, "                      attaching the CLK to a battery backup state file for the\n");
+fprintf (st, "                      TOY clock (i.e. sim> attach CLK TOY_CLOCK).  When\n");
+fprintf (st, "                      operating in OS Agnostic mode, the TODR will initially\n");
+fprintf (st, "                      start counting from 0 and be adjusted differently when\n");
+fprintf (st, "                      an OS specifically writes to the TODR.  VMS determines\n");
+fprintf (st, "                      if the TODR currently contains a valid time if the value\n");
+fprintf (st, "                      it sees is less than about 1 month.  If the time isn't\n");
+fprintf (st, "                      valid VMS will prompt to set the time during the system\n");
+fprintf (st, "                      boot.  While prompting for the time it will wait for an\n");
+fprintf (st, "                      answer to the prompt for up to the SYSGEN parameter\n");
+fprintf (st, "                      TIMEPROMPTWAIT seconds.  A value of 0 for TIMEPROMPTWAIT\n");
+fprintf (st, "                      will disable the clock setting prompt.\n");
+fprint_reg_help (st, dptr);
+return SCPE_OK;
+}
+
 char *clk_description (DEVICE *dptr)
 {
 return "time of year clock";
diff --git a/VAX/vax860_stddev.c b/VAX/vax860_stddev.c
index 497edda1..00736480 100644
--- a/VAX/vax860_stddev.c
+++ b/VAX/vax860_stddev.c
@@ -250,6 +250,9 @@ char *tto_description (DEVICE *dptr);
 char *clk_description (DEVICE *dptr);
 char *tmr_description (DEVICE *dptr);
 char *rlcs_description (DEVICE *dptr);
+t_stat tti_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
+t_stat tto_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
+t_stat clk_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
 t_stat clk_attach (UNIT *uptr, char *cptr);
 t_stat clk_detach (UNIT *uptr);
 t_stat tmr_reset (DEVICE *dptr);
@@ -299,7 +302,7 @@ DEVICE tti_dev = {
     4, 10, 31, 1, 16, 8,
     NULL, NULL, &tti_reset,
     NULL, NULL, NULL,
-    NULL, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, 
+    NULL, 0, 0, NULL, NULL, NULL, &tti_help, NULL, NULL, 
     &tti_description
     };
 
@@ -340,7 +343,7 @@ DEVICE tto_dev = {
     4, 10, 31, 1, 16, 8,
     NULL, NULL, &tto_reset,
     NULL, NULL, NULL,
-    NULL, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, 
+    NULL, 0, 0, NULL, NULL, NULL, &tto_help, NULL, NULL, 
     &tto_description
     };
 
@@ -365,7 +368,7 @@ DEVICE clk_dev = {
     1, 0, 8, 4, 0, 32,
     NULL, NULL, &clk_reset,
     NULL, &clk_attach, &clk_detach,
-    NULL, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, 
+    NULL, 0, 0, NULL, NULL, NULL, &clk_help, NULL, NULL, 
     &clk_description
     };
 
@@ -622,6 +625,16 @@ sim_activate_abs (&tti_unit[ID_CT], KBD_WAIT (tti_unit[ID_CT].wait, tmr_poll));
 return SCPE_OK;
 }
 
+t_stat tti_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
+{
+fprintf (st, "Console Terminal Input (TTI)\n\n");
+fprintf (st, "The terminal input (TTI) polls the console keyboard for input.\n\n");
+fprint_set_help (st, dptr);
+fprint_show_help (st, dptr);
+fprint_reg_help (st, dptr);
+return SCPE_OK;
+}
+
 char *tti_description (DEVICE *dptr)
 {
 return "console terminal input";
@@ -674,6 +687,16 @@ sim_cancel (&tto_unit[ID_LC]);
 return SCPE_OK;
 }
 
+t_stat tto_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
+{
+fprintf (st, "Console Terminal Output (TTO)\n\n");
+fprintf (st, "The terminal output (TTO) writes to the simulator console.\n\n");
+fprint_set_help (st, dptr);
+fprint_show_help (st, dptr);
+fprint_reg_help (st, dptr);
+return SCPE_OK;
+}
+
 char *tto_description (DEVICE *dptr)
 {
 return "console terminal output";
@@ -841,6 +864,37 @@ if (clk_unit.filebuf == NULL) {                         /* make sure the TODR is
 return SCPE_OK;
 }
 
+t_stat clk_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
+{
+fprintf (st, "Real-Time Clock (CLK)\n\n");
+fprintf (st, "The real-time clock autocalibrates; the clock interval is adjusted up or down\n");
+fprintf (st, "so that the clock tracks actual elapsed time.\n\n");
+fprintf (st, "There are two modes of TODR operation:\n\n");
+fprintf (st, "   Default VMS mode.  Without initializing the TODR it returns the current\n");
+fprintf (st, "                      time of year offset which VMS would set the clock to\n");
+fprintf (st, "                      if VMS knew the correct time (i.e. by manual input).\n");
+fprintf (st, "                      This is correct almost all the time unless a VMS disk\n");
+fprintf (st, "                      hadn't been booted from in the current year.  This mode\n");
+fprintf (st, "                      produces strange time results for non VMS OSes on each\n");
+fprintf (st, "                      system boot.\n");
+fprintf (st, "   OS Agnostic mode.  This mode behaves precisely like the VAX780 TODR and\n");
+fprintf (st, "                      works correctly for all OSes.  This mode is enabled by\n");
+fprintf (st, "                      attaching the CLK to a battery backup state file for the\n");
+fprintf (st, "                      TOY clock (i.e. sim> attach CLK TOY_CLOCK).  When\n");
+fprintf (st, "                      operating in OS Agnostic mode, the TODR will initially\n");
+fprintf (st, "                      start counting from 0 and be adjusted differently when\n");
+fprintf (st, "                      an OS specifically writes to the TODR.  VMS determines\n");
+fprintf (st, "                      if the TODR currently contains a valid time if the value\n");
+fprintf (st, "                      it sees is less than about 1 month.  If the time isn't\n");
+fprintf (st, "                      valid VMS will prompt to set the time during the system\n");
+fprintf (st, "                      boot.  While prompting for the time it will wait for an\n");
+fprintf (st, "                      answer to the prompt for up to the SYSGEN parameter\n");
+fprintf (st, "                      TIMEPROMPTWAIT seconds.  A value of 0 for TIMEPROMPTWAIT\n");
+fprintf (st, "                      will disable the clock setting prompt.\n");
+fprint_reg_help (st, dptr);
+return SCPE_OK;
+}
+
 char *clk_description (DEVICE *dptr)
 {
 return "time of year clock";
diff --git a/VAX/vax_stddev.c b/VAX/vax_stddev.c
index 284b7f03..771095aa 100644
--- a/VAX/vax_stddev.c
+++ b/VAX/vax_stddev.c
@@ -122,8 +122,10 @@ t_stat clk_detach (UNIT *uptr);
 t_stat todr_resync (void);
 char *tti_description (DEVICE *dptr);
 char *tto_description (DEVICE *dptr);
-t_stat clk_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
 char *clk_description (DEVICE *dptr);
+t_stat tti_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
+t_stat tto_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
+t_stat clk_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
 
 extern int32 sysd_hlt_enb (void);
 extern int32 fault_PC;
@@ -163,7 +165,7 @@ DEVICE tti_dev = {
     1, 10, 31, 1, 16, 8,
     NULL, NULL, &tti_reset,
     NULL, NULL, NULL,
-    &tti_dib, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, 
+    &tti_dib, 0, 0, NULL, NULL, NULL, &tti_help, NULL, NULL, 
     &tti_description
     };
 
@@ -193,7 +195,7 @@ REG tto_reg[] = {
 MTAB tto_mod[] = {
     { TT_MODE,  TT_MODE_7B, "7b", "7B",     NULL, NULL,      NULL, "Set 7 bit mode" },
     { TT_MODE,  TT_MODE_8B, "8b", "8B",     NULL, NULL,      NULL, "Set 8 bit mode" },
-    { TT_MODE,  TT_MODE_7P, "7p", "7P",     NULL, NULL,      NULL, "Set 7 bit mode (suppress non printing)" },
+    { TT_MODE,  TT_MODE_7P, "7p", "7P",     NULL, NULL,      NULL, "Set 7 bit mode (suppress non printing output)" },
     { MTAB_XTD|MTAB_VDV, 0, "VECTOR", NULL, NULL, &show_vec, NULL, "Display interrupt vector" },
     { 0 }
     };
@@ -203,7 +205,7 @@ DEVICE tto_dev = {
     1, 10, 31, 1, 16, 8,
     NULL, NULL, &tto_reset,
     NULL, NULL, NULL,
-    &tto_dib, 0, 0, NULL, NULL, NULL, NULL, NULL, NULL, 
+    &tto_dib, 0, 0, NULL, NULL, NULL, &tto_help, NULL, NULL, 
     &tto_description
     };
 
@@ -361,6 +363,21 @@ sim_activate (&tti_unit, KBD_WAIT (tti_unit.wait, tmr_poll));
 return SCPE_OK;
 }
 
+t_stat tti_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
+{
+fprintf (st, "Console Terminal Input (TTI)\n\n");
+fprintf (st, "The terminal input (TTI) polls the console keyboard for input.\n\n");
+fprintf (st, "When the console terminal is attached to a Telnet session or the simulator is\n");
+fprintf (st, "running from a Windows command prompt, it recognizes BREAK.  If BREAK is\n");
+fprintf (st, "entered, and BDR<7> is set (also known as SET CPU NOAUTOBOOT), control returns\n");
+fprintf (st, "to the console firmware; otherwise, BREAK is treated as a normal terminal\n");
+fprintf (st, "input condition.\n\n");
+fprint_set_help (st, dptr);
+fprint_show_help (st, dptr);
+fprint_reg_help (st, dptr);
+return SCPE_OK;
+}
+
 char *tti_description (DEVICE *dptr)
 {
 return "console terminal input";
@@ -400,6 +417,16 @@ sim_cancel (&tto_unit);                                 /* deactivate unit */
 return SCPE_OK;
 }
 
+t_stat tto_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
+{
+fprintf (st, "Console Terminal Output (TTO)\n\n");
+fprintf (st, "The terminal output (TTO) writes to the simulator console.\n\n");
+fprint_set_help (st, dptr);
+fprint_show_help (st, dptr);
+fprint_reg_help (st, dptr);
+return SCPE_OK;
+}
+
 char *tto_description (DEVICE *dptr)
 {
 return "console terminal output";
@@ -539,7 +566,7 @@ fprintf (st, "   Default VMS mode.  Without initializing the TODR it returns the
 fprintf (st, "                      time of year offset which VMS would set the clock to\n");
 fprintf (st, "                      if VMS knew the correct time (i.e. by manual input).\n");
 fprintf (st, "                      This is correct almost all the time unless a VMS disk\n");
-fprintf (st, "                      hadn’t been booted from in the current year.  This mode\n");
+fprintf (st, "                      hadn't been booted from in the current year.  This mode\n");
 fprintf (st, "                      produces strange time results for non VMS OSes on each\n");
 fprintf (st, "                      system boot.\n");
 fprintf (st, "   OS Agnostic mode.  This mode behaves precisely like the VAX780 TODR and\n");
@@ -548,10 +575,14 @@ fprintf (st, "                      attaching the CLK to a battery backup state
 fprintf (st, "                      TOY clock (i.e. sim> attach CLK TOY_CLOCK).  When\n");
 fprintf (st, "                      operating in OS Agnostic mode, the TODR will initially\n");
 fprintf (st, "                      start counting from 0 and be adjusted differently when\n");
-fprintf (st, "                      an OS specifically writes to the TODR.  VMS will prompt\n");
-fprintf (st, "                      to set the time on each boot (if the TODR value is less\n");
-fprintf (st, "                      than about 1 month) unless the SYSGEN parameter\n");
-fprintf (st, "                      TIMEPROMPTWAIT is set to 0.\n");
+fprintf (st, "                      an OS specifically writes to the TODR.  VMS determines\n");
+fprintf (st, "                      if the TODR currently contains a valid time if the value\n");
+fprintf (st, "                      it sees is less than about 1 month.  If the time isn't\n");
+fprintf (st, "                      valid VMS will prompt to set the time during the system\n");
+fprintf (st, "                      boot.  While prompting for the time it will wait for an\n");
+fprintf (st, "                      answer to the prompt for up to the SYSGEN parameter\n");
+fprintf (st, "                      TIMEPROMPTWAIT seconds.  A value of 0 for TIMEPROMPTWAIT\n");
+fprintf (st, "                      will disable the clock setting prompt.\n");
 fprint_reg_help (st, dptr);
 return SCPE_OK;
 }
diff --git a/doc/vax780_doc.doc b/doc/vax780_doc.doc
index 7b708901..fdc37d9f 100644
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diff --git a/doc/vax_doc.doc b/doc/vax_doc.doc
index c3e305c9..28f6eaae 100644
Binary files a/doc/vax_doc.doc and b/doc/vax_doc.doc differ