diff --git a/AltairZ80/altairz80_sio.c b/AltairZ80/altairz80_sio.c
index 62a03dc7..ef5fbae6 100644
--- a/AltairZ80/altairz80_sio.c
+++ b/AltairZ80/altairz80_sio.c
@@ -243,7 +243,7 @@ static int32 currentNameIndex           = 0;
 static int32 lastPathSeparatorIndex     = 0;
 static int32 firstPathCharacterIndex    = 0;
 
-static void deleteNameList() {
+static void deleteNameList(void) {
     while (nameListHead != NULL) {
         NameNode_t *next = nameListHead -> next;
         free(nameListHead -> name);
diff --git a/AltairZ80/m68k/m68kasm.c b/AltairZ80/m68k/m68kasm.c
index 2fac834c..7598e73d 100644
--- a/AltairZ80/m68k/m68kasm.c
+++ b/AltairZ80/m68k/m68kasm.c
@@ -3758,7 +3758,7 @@ static int oplookup(const char* s)
 
 
 
-static void init_ophash() 
+static void init_ophash(void)
 
 {
 
@@ -3792,7 +3792,7 @@ static char* yystream;
 
 
 
-static int yylex()
+static int yylex(void)
 
 {
 
diff --git a/AltairZ80/m68k/m68kcpu.c b/AltairZ80/m68k/m68kcpu.c
index f0c8b23d..643e3654 100755
--- a/AltairZ80/m68k/m68kcpu.c
+++ b/AltairZ80/m68k/m68kcpu.c
@@ -1151,7 +1151,7 @@ void m68k_pulse_halt(void)
 
 /* Get and set the current CPU context */
 /* This is to allow for multiple CPUs */
-unsigned int m68k_context_size()
+unsigned int m68k_context_size(void)
 {
     return sizeof(m68ki_cpu_core);
 }
diff --git a/AltairZ80/m68k/m68kfpu.c b/AltairZ80/m68k/m68kfpu.c
index 793e6e44..77fb60a7 100644
--- a/AltairZ80/m68k/m68kfpu.c
+++ b/AltairZ80/m68k/m68kfpu.c
@@ -1479,7 +1479,7 @@ static void fmovem(uint16 w2)
     }
 }
 
-static void fscc()
+static void fscc(void)
 {
   // added by JFF, this seems to work properly now 
   int condition = OPER_I_16() & 0x3f;
@@ -1549,7 +1549,7 @@ static void fbcc32(void)
 }
 
 
-void m68040_fpu_op0()
+void m68040_fpu_op0(void)
 {
     m68ki_cpu.fpu_just_reset = 0;
 
@@ -1638,7 +1638,7 @@ static void perform_fsave(uint32 addr, int inc)
 }
 
 // FRESTORE on a NULL frame reboots the FPU - all registers to NaN, the 3 status regs to 0
-static void do_frestore_null()
+static void do_frestore_null(void)
 {
     int i;
 
@@ -1656,7 +1656,7 @@ static void do_frestore_null()
     m68ki_cpu.fpu_just_reset = 1;
 }
 
-void m68040_fpu_op1()
+void m68040_fpu_op1(void)
 {
     int ea = REG_IR & 0x3f;
     int mode = (ea >> 3) & 0x7;
diff --git a/AltairZ80/m68ksim.c b/AltairZ80/m68ksim.c
index 28742c95..c497d7ad 100644
--- a/AltairZ80/m68ksim.c
+++ b/AltairZ80/m68ksim.c
@@ -324,7 +324,7 @@ static uint32 MC6850_data_read(void) {
     return (((ch > 0) && (!stop_cpu)) ? ch & 0xff : 0xff);
 }
 
-static int MC6850_status_read() {
+static int MC6850_status_read(void) {
     return m68k_MC6850_status;
 }
 
diff --git a/AltairZ80/mmd.c b/AltairZ80/mmd.c
index c5f47ab6..8e6e63db 100644
--- a/AltairZ80/mmd.c
+++ b/AltairZ80/mmd.c
@@ -3436,7 +3436,7 @@ static int32 mmddev(int32 Addr, int32 rw, int32 data)
     }
 }
 
-static void intZ80()
+static void intZ80(void)
 {
     if (mmd_ctx->MMD.intenable) {
         vectorInterrupt |= (1 << mmd_ctx->MMD.intvec);
@@ -3502,7 +3502,7 @@ static uint8 MMD_Dev_Read(uint32 Addr)
     return (cData);
 }
 
-static uint8 MMD_FDC_Read_Data()
+static uint8 MMD_FDC_Read_Data(void)
 {
     uint8 cData = 0xff;
 
@@ -3659,7 +3659,7 @@ static void MMD_Command_Stack(int32 Data)
     }
 }
 
-static void MMD_Command_Proc()
+static void MMD_Command_Proc(void)
 {
 
     switch (mmd_ctx->MMD.cmd) {
@@ -3811,7 +3811,7 @@ static const char * MMD_Command_String(int32 command)
     return string;
 }
 
-static uint8 MMD_Result_Stack()
+static uint8 MMD_Result_Stack(void)
 {
     uint8 cData;
 
@@ -3825,7 +3825,7 @@ static uint8 MMD_Result_Stack()
     return cData;
 }
 
-static uint8 MMD_Exec_Format()
+static uint8 MMD_Exec_Format(void)
 {
     uint8 drive = mmd_ctx->drive;
 
@@ -3853,7 +3853,7 @@ static uint8 MMD_Exec_Format()
     return 0;
 }
 
-static uint8 MMD_Exec_Read()
+static uint8 MMD_Exec_Read(void)
 {
     uint8 cData;
     uint8 drive = mmd_ctx->drive;
@@ -3920,7 +3920,7 @@ static uint8 MMD_Exec_Write(int32 Data)
     return Data;
 }
 
-static uint8 MMD_Term_Count()
+static uint8 MMD_Term_Count(void)
 {
     if (mmd_ctx->MMD.status & MMD_STAT_EXM) {
         mmd_ctx->MMD.tc = TRUE;
@@ -4002,7 +4002,7 @@ static uint8 MMD_Write_Sector(uint8 drive)
     return r;
 }
 
-static void MMD_Dump_Sector() {
+static void MMD_Dump_Sector(void) {
     int32 i;
 
     for (i = 0; i < 32; i++) {
diff --git a/AltairZ80/s100_dj2d.c b/AltairZ80/s100_dj2d.c
index 25cb0c52..2cd3c120 100644
--- a/AltairZ80/s100_dj2d.c
+++ b/AltairZ80/s100_dj2d.c
@@ -1494,7 +1494,7 @@ static t_stat dj2d_show_baud(FILE *st, UNIT *uptr, int32 value, const void *desc
     return SCPE_OK;
 }
 
-static t_stat dj2d_config_line()
+static t_stat dj2d_config_line(void)
 {
     char config[20];
     const char *fmt;
diff --git a/AltairZ80/s100_icom.c b/AltairZ80/s100_icom.c
index 6d6c6bed..a8b4ffa6 100644
--- a/AltairZ80/s100_icom.c
+++ b/AltairZ80/s100_icom.c
@@ -995,7 +995,7 @@ static int32 icomdev(int32 Addr, int32 rw, int32 data)
     }
 }
 
-static void showReadSec()
+static void showReadSec(void)
 {
     int i;
     ICOM_REG *pICOM;
@@ -1015,7 +1015,7 @@ static void showReadSec()
     }
 }
 
-static void showWriteSec()
+static void showWriteSec(void)
 {
     int i;
     ICOM_REG *pICOM;
diff --git a/AltairZ80/s100_jadedd.c b/AltairZ80/s100_jadedd.c
index 1d203524..0fe8aec2 100644
--- a/AltairZ80/s100_jadedd.c
+++ b/AltairZ80/s100_jadedd.c
@@ -780,7 +780,7 @@ static void showsector(uint8 drive, uint8 isRead, uint8 *buf) {
     sim_debug(RD_DATA_DETAIL_MSG|WR_DATA_DETAIL_MSG, &jade_dev, "\n");
 }
 
-static void showcb()
+static void showcb(void)
 {
     DBG_PRINT((JADE_SNAME
         " cmd=0x%02X drv=%d trk=%02d sec=%02d mod=0x%02X sts=0x%02X lad=%04X lng=%04X\n",
@@ -953,7 +953,7 @@ static uint8 PROM_Boot(JADE_INFO *info)
 ** Boot Loader Transient (BLT) module into the sector buffer.
 ** The BLT is emulated with DCM_DBSLdr() function.
 */
-static void DCM_Init()
+static void DCM_Init(void)
 {
     /* Move Bank 1 to Bank 0 */
     memcpy(bank0, bank1, JADE_BANK_SIZE);
@@ -985,7 +985,7 @@ static void DCM_Init()
 #define LNG_1K    1024
 #define SEC_BG    4                    /* First BIOS sector */
 
-static void DCM_DBSLdr()
+static void DCM_DBSLdr(void)
 {
     uint8 sec = SEC_BG;
     uint16 d = LNG_1K;
@@ -1022,7 +1022,7 @@ static void DCM_DBSLdr()
 * THIS FUNCTION HANDLES TO THE INDIVIDUAL COMMAND       *
 * ROUTINES.                                             *
 ********************************************************/
-static uint8 DCM_Execute()
+static uint8 DCM_Execute(void)
 {
     uint8 sts;
 
diff --git a/AltairZ80/s100_vdm1.c b/AltairZ80/s100_vdm1.c
index 7d8024a4..4f85e9bb 100644
--- a/AltairZ80/s100_vdm1.c
+++ b/AltairZ80/s100_vdm1.c
@@ -465,7 +465,7 @@ const char *vdm1_description (DEVICE *dptr)
 /*
  * Draw and refresh the screen in the video window
  */
-static void vdm1_refresh() {
+static void vdm1_refresh(void) {
     if (vdm1_active) {
         vdm1_render();
         vid_draw_window(vdm1_vptr, VDM1_MARGIN, VDM1_MARGIN, VDM1_XSIZE, VDM1_YSIZE, vdm1_surface);
@@ -477,7 +477,7 @@ static void vdm1_refresh() {
  * The VDM-1 display is make up of 16 64-character rows. Each character occupies
  * 1 byte in memory from CC00-CFFF.
  */
-static void vdm1_render()
+static void vdm1_render(void)
 {
     uint8 x,y,s,c,c1;
     int addr = 0;