--- a/io.c	Thu Jul 05 00:02:54 2018 +0900
+++ b/io.c	Thu Jul 05 02:00:14 2018 +0900
@@ -1,4 +1,4 @@
-/* 6809 Simulator V09.
+/* 6808 Simulator V09.
 
    created 1993,1994 by L.C. Benschop.
    copyleft (c) 1994-2014 by the sbc09 team, see AUTHORS for more details.
@@ -46,25 +46,17 @@
 /*
  *   IO Map ( can be overrupped by ROM )
  *
- *   IOPAGE ~ IOPAGE+0xff
+ *   IOPAGE ~ IOPAGE+0x7f
+ *       for OS9 level2
+ *       IOPAGE 0xff80 means ioport beging 0xff80 but IOPAGE itself starts 0xff00
+ *       0xff00-0xff7f, 0xffe0-0xffff can be used as ROM in fixed area
  *
  *   IOPAGE + 0x00   ACIA  control
  *   IOPAGE + 0x01   ACIA  data
  *
- *   IOPAGE + 0x10   Timer control       0x8f start timer/0x80 stop timer/0x04 update date
- *   IOPAGE + 0x11-  YY/MM/DD/HH/MM/SS
- *
- *   IOPAGE + 0x20   Disk control        0x81 read/0x55 write   0 ... ok / 0xff .. error
- *   IOPAGE + 0x21   drive no
- *   IOPAGE + 0x22   LSN2
- *   IOPAGE + 0x23   LSN1
- *   IOPAGE + 0x24   LSN0
- *   IOPAGE + 0x25   ADR2
- *   IOPAGE + 0x26   ADR1
- *
- *   IOPAGE + 0x91   MMU Taskreg         0  system map, 1 user map
- *   IOPAGE + 0xa0-0xa7   MMU reg        system map
- *   IOPAGE + 0xa8-0xaf   MMU reg        user   map
+ *   IOPAGE + 0x11   MMU Taskreg         0  system map, 1 user map
+ *   IOPAGE + 0x20-0x27   MMU reg        system map
+ *   IOPAGE + 0x28-0x2f   MMU reg        user   map
  *
  *        on reset tr==0 and only IOPAGE is valid
  *        translatation occur only on non-IOPAGE
@@ -73,6 +65,18 @@
  *            tr=0  mmu=IOPAGE+0xa0
  *            tr=1  mmu=IOPAGE+0xa8
  *
+ *   IOPAGE + 0x30   Timer control       0x8f start timer/0x80 stop timer/0x04 update date
+ *   IOPAGE + 0x31-  YY/MM/DD/HH/MM/SS
+ *
+ *   IOPAGE + 0x40   Disk control        0x81 read/0x55 write   0 ... ok / 0xff .. error
+ *   IOPAGE + 0x41   drive no
+ *   IOPAGE + 0x42   LSN2
+ *   IOPAGE + 0x43   LSN1
+ *   IOPAGE + 0x44   LSN0
+ *   IOPAGE + 0x45   ADR2
+ *   IOPAGE + 0x46   ADR1
+ *
+ *
  */
 
 #define SECSIZE 256
@@ -178,13 +182,13 @@
 
 int do_input( a) {
         static int c, f = EOF;
-        if (a == 0) {
+        if (a == 0+(IOPAGE&0xff)) {
                 if (f == EOF)
                         f = char_input();
                 if (f != EOF)
                         c = f;
                 return 2 + (f != EOF);
-        } else if (a == 1) { /*data port*/
+        } else if (a == 1+(IOPAGE&0xff)) { /*data port*/
                 if (f == EOF)
                         f = char_input();
                 if (f != EOF) {
@@ -198,7 +202,7 @@
 
 void do_output(int a, int c) {
         int i, sum;
-        if (a == 1) { /* ACIA data port,ignore address */
+        if (a == 1+(IOPAGE&0xff)) { /* ACIA data port,ignore address */
                 if (!xmstat) {
                         if (logfile && c != 127 && (c >= ' ' || c == '\n'))
                                 putc(c, logfile);
@@ -244,12 +248,12 @@
                                 xidx = 0;
                         }
                 }
-        } else if (a >= 0x90) { /* mmu */
+        } else if (a >= 0x10+(IOPAGE&0xff)) { /* mmu */
              do_mmu(a,c);
-        } else if (a >= 0x20) { /* disk */
+        } else if (a >= 0x30+(IOPAGE&0xff)) { /* timer */
+             do_timer(a,c);
+        } else if (a >= 0x40+(IOPAGE&0xff)) { /* disk */
              do_disk(a,c);
-        } else if (a >= 0x10) { /* disk */
-             do_timer(a,c);
         }
 }
 
@@ -266,38 +270,38 @@
 
 void do_timer(int a, int c) {
    struct itimerval timercontrol;
-   if (a==0x10 && c==0x8f) {
+   if (a==0x30 && c==0x8f) {
         timercontrol.it_interval.tv_sec = 0;
         timercontrol.it_interval.tv_usec = 20000;
         timercontrol.it_value.tv_sec = 0;
         timercontrol.it_value.tv_usec = 20000;
         setitimer(ITIMER_REAL, &timercontrol, NULL);
-   } else if (a==0x10 && c==0x80) {
+   } else if (a==0x30 && c==0x80) {
         timercontrol.it_interval.tv_sec = 0;
         timercontrol.it_interval.tv_usec = 0;
         setitimer(ITIMER_REAL, &timercontrol, NULL);
-   } else if (a==0x10 && c==0x04) {
+   } else if (a==0x30 && c==0x04) {
       time_t tm = time(0);
       struct tm *t = localtime(&tm);
-      mem[IOPAGE+0x11] = t->tm_year;
-      mem[IOPAGE+0x12] = t->tm_mon;
-      mem[IOPAGE+0x13] = t->tm_mday;
-      mem[IOPAGE+0x14] = t->tm_hour;
-      mem[IOPAGE+0x15] = t->tm_min;
-      mem[IOPAGE+0x16] = t->tm_sec;
+      mem[IOPAGE+0x31] = t->tm_year;
+      mem[IOPAGE+0x32] = t->tm_mon;
+      mem[IOPAGE+0x33] = t->tm_mday;
+      mem[IOPAGE+0x34] = t->tm_hour;
+      mem[IOPAGE+0x35] = t->tm_min;
+      mem[IOPAGE+0x36] = t->tm_sec;
    } else {
       mem[IOPAGE+a]=c;
    }
 }
 
 void do_disk(int a, int c) {
-   if (a!=0x20) {
+   if (a!=0x40) {
       mem[IOPAGE+a]=c;
       return;
    }
-   int drv = mem[IOPAGE+0x21];
-   int lsn = (mem[IOPAGE+0x22]<<16) + (mem[IOPAGE+0x23]<<8) + mem[IOPAGE+0x24];
-   int buf = (mem[IOPAGE+0x25]<<8) + mem[IOPAGE+0x26];
+   int drv = mem[IOPAGE+0x41];
+   int lsn = (mem[IOPAGE+0x42]<<16) + (mem[IOPAGE+0x43]<<8) + mem[IOPAGE+0x44];
+   int buf = (mem[IOPAGE+0x45]<<8) + mem[IOPAGE+0x46];
    if (drv > 1 || disk[drv]==0) goto error;
    if (c==0x81) {
       if (lseek(fileno(disk[drv]),lsn*SECSIZE,SEEK_SET)==-1) goto error;
@@ -306,24 +310,24 @@
       if (lseek(fileno(disk[drv]),lsn*SECSIZE,SEEK_SET)==-1) goto error;
       if (write(fileno(disk[drv]),&mem[buf],SECSIZE)==-1) goto error;
    }
-   mem[IOPAGE+0x20] = 0;
+   mem[IOPAGE+0x40] = 0;
    return;
 error :
-   mem[IOPAGE+0x20] = 0xff;
+   mem[IOPAGE+0x40] = 0xff;
 }
 
 void do_mmu(int a, int c)
 {
 #ifdef USE_MMU
 
-   if (a==0x91) {
+   if (a==0x11) {
        if (c&0) {
            mmu = phymem+memsize-0x10000+0xffa0;
        } else {
            mmu = phymem+memsize-0x10000+0xffa8;
        }
        mem[IOPAGE+a] = c;
-   } if (0xa0 <= a && a <= 0xaf) {
+   } if (0x20 <= a && a <= 0x2f) {
        mem[IOPAGE+a] = c;
    }