diff --git a/PDP11/pdp11_vt.c b/PDP11/pdp11_vt.c
index a7228272..ccdd3b3b 100644
--- a/PDP11/pdp11_vt.c
+++ b/PDP11/pdp11_vt.c
@@ -97,7 +97,7 @@ t_stat vt_show_hspace(FILE *st, UNIT *uptr, int32 val, void *desc);
 t_stat vt_set_vspace(UNIT *uptr, int32 val, char *cptr, void *desc);
 t_stat vt_show_vspace(FILE *st, UNIT *uptr, int32 val, void *desc);
 t_stat vt_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr);
-char *vt_description (DEVICE *dptr);
+const char *vt_description (DEVICE *dptr);
 
 /* VT11/VS60 data structures
 
@@ -404,7 +404,7 @@ vt_fetch(uint32 addr, vt11word *wp)
     return 1;                           /* used to set "time_out" flag */
 }
 
-char *vt_description (DEVICE *dptr)
+const char *vt_description (DEVICE *dptr)
 {
 return (VS60) ? "VS60 Display processor"
               : "VT11 Display processor";
diff --git a/VAX/vax610_io.c b/VAX/vax610_io.c
index 30122a5e..8d5c7179 100644
--- a/VAX/vax610_io.c
+++ b/VAX/vax610_io.c
@@ -40,7 +40,7 @@ extern jmp_buf save_env;
 
 int32 eval_int (void);
 t_stat qba_reset (DEVICE *dptr);
-char *qba_description (DEVICE *dptr);
+const char *qba_description (DEVICE *dptr);
 
 /* Qbus adapter data structures
 
@@ -338,7 +338,7 @@ for (i = 0; i < IPL_HLVL; i++)
 return SCPE_OK;
 }
 
-char *qba_description (DEVICE *dptr)
+const char *qba_description (DEVICE *dptr)
 {
 return "Qbus adapter";
 }
diff --git a/VAX/vax610_mem.c b/VAX/vax610_mem.c
index 273b761c..7b10b472 100644
--- a/VAX/vax610_mem.c
+++ b/VAX/vax610_mem.c
@@ -43,7 +43,7 @@ int32 mctl_count = 0;
 t_stat mctl_rd (int32 *data, int32 PA, int32 access);
 t_stat mctl_wr (int32 data, int32 PA, int32 access);
 t_stat mctl_reset (DEVICE *dptr);
-char *mctl_description (DEVICE *dptr);
+const char *mctl_description (DEVICE *dptr);
 
 /* MCTL data structures
 
@@ -107,7 +107,7 @@ mctl_count = (int32)(MEMSIZE >> 18);                    /* memory controllers en
 return SCPE_OK;
 }
 
-char *mctl_description (DEVICE *dptr)
+const char *mctl_description (DEVICE *dptr)
 {
 return "memory controller";
 }
diff --git a/VAX/vax610_sysdev.c b/VAX/vax610_sysdev.c
index 01296a8e..a6da4e40 100644
--- a/VAX/vax610_sysdev.c
+++ b/VAX/vax610_sysdev.c
@@ -69,7 +69,7 @@ static struct boot_dev boot_tab[] = {
     };
 
 t_stat sysd_reset (DEVICE *dptr);
-char *sysd_description (DEVICE *dptr);
+const char *sysd_description (DEVICE *dptr);
 t_stat vax610_boot (int32 flag, char *ptr);
 t_stat vax610_boot_parse (int32 flag, char *ptr);
 t_stat cpu_boot (int32 unitno, DEVICE *dptr);
@@ -524,7 +524,7 @@ sim_vm_cmd = vax610_cmd;
 return SCPE_OK;
 }
 
-char *sysd_description (DEVICE *dptr)
+const char *sysd_description (DEVICE *dptr)
 {
 return "system devices";
 }
diff --git a/VAX/vax730_mem.c b/VAX/vax730_mem.c
index d6d8d583..6a3e0d06 100644
--- a/VAX/vax730_mem.c
+++ b/VAX/vax730_mem.c
@@ -74,7 +74,7 @@ uint32 mcsr2 = 0;
 t_stat mctl_reset (DEVICE *dptr);
 t_stat mctl_rdreg (int32 *val, int32 pa, int32 mode);
 t_stat mctl_wrreg (int32 val, int32 pa, int32 mode);
-char *mctl_description (DEVICE *dptr);
+const char *mctl_description (DEVICE *dptr);
 
 /* MCTLx data structures
 
@@ -192,7 +192,7 @@ mcsr2 = MEM_BOARD_MASK(MEMSIZE, MEM_SIZE_64K) | MCSR2_CS;     /* Use 64k chips *
 return SCPE_OK;
 }
 
-char *mctl_description (DEVICE *dptr)
+const char *mctl_description (DEVICE *dptr)
 {
 return "memory controller";
 }
diff --git a/VAX/vax730_rb.c b/VAX/vax730_rb.c
index 869816af..0c5cdfc7 100644
--- a/VAX/vax730_rb.c
+++ b/VAX/vax730_rb.c
@@ -215,7 +215,7 @@ t_stat rb_rd32 (int32 *data, int32 PA, int32 access);
 t_stat rb_wr32 (int32 data, int32 PA, int32 access);
 t_stat rb_svc (UNIT *uptr);
 t_stat rb_reset (DEVICE *dptr);
-char *rb_description (DEVICE *dptr);
+const char *rb_description (DEVICE *dptr);
 void rb_set_done (int32 error);
 t_stat rb_attach (UNIT *uptr, char *cptr);
 t_stat rb_set_size (UNIT *uptr, int32 val, char *cptr, void *desc);
@@ -639,7 +639,7 @@ if (rbxb == NULL)
 return SCPE_OK;
 }
 
-char *rb_description (DEVICE *dptr)
+const char *rb_description (DEVICE *dptr)
 {
 return "RB730 disk controller";
 }
diff --git a/VAX/vax730_sys.c b/VAX/vax730_sys.c
index 038e41e2..fc09534a 100644
--- a/VAX/vax730_sys.c
+++ b/VAX/vax730_sys.c
@@ -81,7 +81,7 @@ extern jmp_buf save_env;
 extern int32 p1;
 
 t_stat sysb_reset (DEVICE *dptr);
-char *sysb_description (DEVICE *dptr);
+const char *sysb_description (DEVICE *dptr);
 t_stat vax730_boot (int32 flag, char *ptr);
 t_stat vax730_boot_parse (int32 flag, char *ptr);
 t_stat cpu_boot (int32 unitno, DEVICE *dptr);
@@ -580,7 +580,7 @@ sim_vm_cmd = vax730_cmd;
 return SCPE_OK;
 }
 
-char *sysb_description (DEVICE *dptr)
+const char *sysb_description (DEVICE *dptr)
 {
 return "system bus controller";
 }
diff --git a/VAX/vax730_uba.c b/VAX/vax730_uba.c
index 72094503..6ebe88ff 100644
--- a/VAX/vax730_uba.c
+++ b/VAX/vax730_uba.c
@@ -97,7 +97,7 @@ extern UNIT cpu_unit;
 extern int32 p1;
 
 t_stat uba_reset (DEVICE *dptr);
-char *uba_description (DEVICE *dptr);
+const char *uba_description (DEVICE *dptr);
 t_stat uba_ex (t_value *vptr, t_addr exta, UNIT *uptr, int32 sw);
 t_stat uba_dep (t_value val, t_addr exta, UNIT *uptr, int32 sw);
 t_stat uba_rdreg (int32 *val, int32 pa, int32 mode);
@@ -665,7 +665,7 @@ fprintf (of, "Invalid argument\n");
 return SCPE_OK;
 }
 
-char *uba_description (DEVICE *dptr)
+const char *uba_description (DEVICE *dptr)
 {
 return "Unibus adapter";
 }
diff --git a/VAX/vax750_cmi.c b/VAX/vax750_cmi.c
index 6f0ea88a..141101e9 100644
--- a/VAX/vax750_cmi.c
+++ b/VAX/vax750_cmi.c
@@ -101,7 +101,7 @@ extern jmp_buf save_env;
 extern int32 p1;
 
 t_stat cmi_reset (DEVICE *dptr);
-char *cmi_description (DEVICE *dptr);
+const char *cmi_description (DEVICE *dptr);
 void cmi_set_tmo (void);
 t_stat vax750_boot (int32 flag, char *ptr);
 t_stat vax750_boot_parse (int32 flag, char *ptr);
@@ -666,7 +666,7 @@ cmi_cadr = 0;
 return SCPE_OK;
 }
 
-char *cmi_description (DEVICE *dptr)
+const char *cmi_description (DEVICE *dptr)
 {
 return "CPU/Memory interconnect";
 }
diff --git a/VAX/vax750_mem.c b/VAX/vax750_mem.c
index 63b6544c..1938232d 100644
--- a/VAX/vax750_mem.c
+++ b/VAX/vax750_mem.c
@@ -89,7 +89,7 @@ uint32 mcsr1 = 0;
 uint32 mcsr2 = 0;
 
 t_stat mctl_reset (DEVICE *dptr);
-char *mctl_description (DEVICE *dptr);
+const char *mctl_description (DEVICE *dptr);
 t_stat mctl_rdreg (int32 *val, int32 pa, int32 mode);
 t_stat mctl_wrreg (int32 val, int32 pa, int32 mode);
 
@@ -227,7 +227,7 @@ mcsr2 = MCSR2_INIT | (boards & board_mask) | ((large_slot_size == MEM_SIZE_256K)
 return SCPE_OK;
 }
 
-char *mctl_description (DEVICE *dptr)
+const char *mctl_description (DEVICE *dptr)
 {
 return "Memory controller";
 }
diff --git a/VAX/vax750_stddev.c b/VAX/vax750_stddev.c
index 27b49ae2..e8548cb1 100644
--- a/VAX/vax750_stddev.c
+++ b/VAX/vax750_stddev.c
@@ -222,10 +222,10 @@ t_stat clk_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, const char *cpt
 t_stat clk_attach (UNIT *uptr, char *cptr);
 t_stat clk_detach (UNIT *uptr);
 t_stat tmr_reset (DEVICE *dptr);
-char *tmr_description (DEVICE *dptr);
+const char *tmr_description (DEVICE *dptr);
 t_stat td_svc (UNIT *uptr);
 t_stat td_reset (DEVICE *dptr);
-char *td_description (DEVICE *dptr);
+const char *td_description (DEVICE *dptr);
 int32 icr_rd (t_bool interp);
 void tmr_incr (uint32 inc);
 void tmr_sched (void);
@@ -998,7 +998,7 @@ todr_resync ();                                         /* resync TODR */
 return SCPE_OK;
 }
 
-char *tmr_description (DEVICE *dptr)
+const char *tmr_description (DEVICE *dptr)
 {
 return "interval timer";
 }
@@ -1279,7 +1279,7 @@ sim_cancel (&td_unit);
 return SCPE_OK;
 }
 
-char *td_description (DEVICE *dptr)
+const char *td_description (DEVICE *dptr)
 {
 return "Console TU58 cartridge";
 }
diff --git a/VAX/vax750_uba.c b/VAX/vax750_uba.c
index a6225bd1..5af25629 100644
--- a/VAX/vax750_uba.c
+++ b/VAX/vax750_uba.c
@@ -95,7 +95,7 @@ extern int32 fault_PC;                                  /* fault PC */
 extern int32 mem_err;
 
 t_stat uba_reset (DEVICE *dptr);
-char *uba_description (DEVICE *dptr);
+const char *uba_description (DEVICE *dptr);
 t_stat uba_ex (t_value *vptr, t_addr exta, UNIT *uptr, int32 sw);
 t_stat uba_dep (t_value val, t_addr exta, UNIT *uptr, int32 sw);
 t_stat uba_rdreg (int32 *val, int32 pa, int32 mode);
@@ -634,7 +634,7 @@ uba_csr3 = 0;
 return SCPE_OK;
 }
 
-char *uba_description (DEVICE *dptr)
+const char *uba_description (DEVICE *dptr)
 {
 return "Unibus adapter";
 }
diff --git a/VAX/vax780_mem.c b/VAX/vax780_mem.c
index 2ef245ab..8b573bd5 100644
--- a/VAX/vax780_mem.c
+++ b/VAX/vax780_mem.c
@@ -91,7 +91,7 @@ uint32 rom_lw[MCTL_NUM][ROMSIZE >> 2];
 extern UNIT cpu_unit;
 
 t_stat mctl_reset (DEVICE *dptr);
-char *mctl_description (DEVICE *dptr);
+const char *mctl_description (DEVICE *dptr);
 t_stat mctl_rdreg (int32 *val, int32 pa, int32 mode);
 t_stat mctl_wrreg (int32 val, int32 pa, int32 mode);
 
@@ -283,7 +283,7 @@ for (i = 0; i < MCTL_NUM; i++) {
 return SCPE_OK;
 }
 
-char *mctl_description (DEVICE *dptr)
+const char *mctl_description (DEVICE *dptr)
 {
 static char buf[64];
 
diff --git a/VAX/vax780_sbi.c b/VAX/vax780_sbi.c
index 41a31dfc..1e997a73 100644
--- a/VAX/vax780_sbi.c
+++ b/VAX/vax780_sbi.c
@@ -139,7 +139,7 @@ extern jmp_buf save_env;
 extern int32 p1;
 
 t_stat sbi_reset (DEVICE *dptr);
-char *sbi_description (DEVICE *dptr);
+const char *sbi_description (DEVICE *dptr);
 void sbi_set_tmo (int32 pa);
 void uba_eval_int (void);
 t_stat vax780_boot (int32 flag, char *ptr);
@@ -739,7 +739,7 @@ sim_vm_cmd = vax780_cmd;
 return SCPE_OK;
 }
 
-char *sbi_description (DEVICE *dptr)
+const char *sbi_description (DEVICE *dptr)
 {
 return "Synchronous Backplane Interconnect";
 }
diff --git a/VAX/vax860_abus.c b/VAX/vax860_abus.c
index d340645c..f74b13fa 100644
--- a/VAX/vax860_abus.c
+++ b/VAX/vax860_abus.c
@@ -124,7 +124,7 @@ extern UNIT cpu_unit;
 
 void uba_eval_int (void);
 t_stat abus_reset (DEVICE *dptr);
-char *abus_description (DEVICE *dptr);
+const char *abus_description (DEVICE *dptr);
 t_stat vax860_boot (int32 flag, char *ptr);
 t_stat vax860_boot_parse (int32 flag, char *ptr);
 t_stat cpu_boot (int32 unitno, DEVICE *dptr);
@@ -799,7 +799,7 @@ init_pamm ();
 return SCPE_OK;
 }
 
-char *abus_description (DEVICE *dptr)
+const char *abus_description (DEVICE *dptr)
 {
 return "bus controller";
 }
diff --git a/VAX/vax860_sbia.c b/VAX/vax860_sbia.c
index b54ec421..c48a55c2 100644
--- a/VAX/vax860_sbia.c
+++ b/VAX/vax860_sbia.c
@@ -92,7 +92,7 @@ extern int32 fault_PC;                                  /* fault PC */
 extern UNIT cpu_unit;
 
 t_stat sbia_reset (DEVICE *dptr);
-char *sbia_description (DEVICE *dptr);
+const char *sbia_description (DEVICE *dptr);
 void sbi_set_tmo (int32 pa);
 t_stat (*nexusR[NEXUS_NUM])(int32 *dat, int32 ad, int32 md);
 t_stat (*nexusW[NEXUS_NUM])(int32 dat, int32 ad, int32 md);
@@ -302,7 +302,7 @@ sbi_csr = SBICSR_SCOEN | SBICSR_SCIEN;
 return SCPE_OK;
 }
 
-char *sbia_description (DEVICE *dptr)
+const char *sbia_description (DEVICE *dptr)
 {
 return "SBI adapter";
 }
diff --git a/VAX/vax_mmu.c b/VAX/vax_mmu.c
index 20f2763c..5cb62db3 100644
--- a/VAX/vax_mmu.c
+++ b/VAX/vax_mmu.c
@@ -93,7 +93,7 @@ static const int32 cvtacc[16] = { 0, 0,
 t_stat tlb_ex (t_value *vptr, t_addr addr, UNIT *uptr, int32 sw);
 t_stat tlb_dep (t_value val, t_addr addr, UNIT *uptr, int32 sw);
 t_stat tlb_reset (DEVICE *dptr);
-char *tlb_description (DEVICE *dptr);
+const char *tlb_description (DEVICE *dptr);
 
 TLBENT fill (uint32 va, int32 lnt, int32 acc, int32 *stat);
 extern int32 ReadIO (uint32 pa, int32 lnt);
@@ -316,7 +316,7 @@ for (i = 0; i < VA_TBSIZE; i++)
 return SCPE_OK;
 }
 
-char *tlb_description (DEVICE *dptr)
+const char *tlb_description (DEVICE *dptr)
     {
     return "translation buffer";
     }