Re-worked mouse code to be devices (to allow for configuration.)

Re-worked the system pathnames (pc.c), renamed cfg_path to usr_path.
Other small things here and there.
Logitech bus mouse re-worked, should be OK now.

src/cpu/808x.c

@@ -18,7 +18,7 @@
  *		2 clocks - fetch opcode 1       2 clocks - execute
  *		2 clocks - fetch opcode 2  etc
  *
- * Version:	@(#)808x.c	1.0.9	2017/11/24
+ * Version:	@(#)808x.c	1.0.10	2017/12/03
  *
  * Authors:	Sarah Walker, <http://pcem-emulator.co.uk/>
  *		Miran Grca, <mgrca8@gmail.com>
@@ -518,7 +518,7 @@ void dumpregs(int force)
 #ifndef RELEASE_BUILD
         indump = 1;
         output=0;
-	(void)plat_chdir(cfg_path);
+	(void)plat_chdir(usr_path);
         nopageerrors=1;
         f=fopen("ram.dmp","wb");
         fwrite(ram,mem_size*1024,1,f);

src/cpu/cpu.c

@@ -8,7 +8,7 @@
  *
  *		CPU type handler.
  *
- * Version:	@(#)cpu.c	1.0.7	2017/11/04
+ * Version:	@(#)cpu.c	1.0.8	2017/11/27
  *
  * Authors:	Sarah Walker, <http://pcem-emulator.co.uk/>
  *		leilei,
@@ -1244,6 +1244,21 @@ void cpu_set()
         }
 }
 
+
+char *
+cpu_current_pc(char *bufp)
+{
+    static char buff[10];
+
+    if (bufp == NULL)
+	bufp = buff;
+
+    sprintf(bufp, "%04X:%04X", CS, cpu_state.pc);
+
+    return(bufp);
+}
+
+
 void cpu_CPUID()
 {
         switch (machines[machine].cpu[cpu_manufacturer].cpus[cpu].cpu_type)

src/cpu/cpu.h

@@ -8,7 +8,7 @@
  *
  *		CPU type handler.
  *
- * Version:	@(#)cpu.h	1.0.3	2017/11/04
+ * Version:	@(#)cpu.h	1.0.4	2017/11/27
  *
  * Authors:	Sarah Walker, <http://pcem-emulator.co.uk/>
  *		leilei,
@@ -151,7 +151,7 @@ typedef struct {
     int		checked; /*Non-zero if selector is known to be valid*/
 } x86seg;
 
-typedef union MMX_REG {
+typedef union {
     uint64_t	q;
     int64_t	sq;
     uint32_t	l[2];
@@ -405,6 +405,8 @@ extern uint8_t	cyrix_read(uint16_t addr, void *priv);
 extern void	loadseg(uint16_t seg, x86seg *s);
 extern void	loadcs(uint16_t seg);
 
+extern char	*cpu_current_pc(char *bufp);
+
 extern void	cpu_update_waitstates(void);
 extern void	cpu_set(void);