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diff --git a/linux/log_io.c b/linux/log_io.c
new file mode 100644
index 0000000..9f3d489
--- /dev/null
+++ b/linux/log_io.c
@@ -0,0 +1,81 @@
+#include <stdio.h>
+
+typedef struct
+{
+	unsigned int addr_min, addr_max;
+	int r8, r16, r32, w8, w16, w32;
+} io_log_location;
+
+static io_log_location io_locations[] =
+{
+	{ 0x400000, 0x9FFFFF, 0, }, // unused
+	{ 0xa00000, 0xa03fff, 0, }, // z80 RAM
+	{ 0xa04000, 0xa05fff, 0, }, // ym2612
+	{ 0xa06000, 0xa060ff, 0, }, // bank reg
+	{ 0xa06100, 0xa07eff, 0, }, // unused
+	{ 0xa07f00, 0xa07fff, 0, }, // vdp
+	{ 0xa08000, 0xa0ffff, 0, }, // 0xa00000-0xa07fff mirror
+	{ 0xa10000, 0xa1001f, 0, }, // i/o
+	{ 0xa10020, 0xa10fff, 0, }, // expansion
+	{ 0xa11000, 0xa110ff, 0, }, // expansion
+	{ 0xa11100, 0xa11101, 0, }, // z80 busreq
+	{ 0xa11102, 0xa111ff, 0, }, // expansion
+	{ 0xa11200, 0xa11201, 0, }, // z80 reset
+	{ 0xa11202, 0xbfffff, 0, }, // expansion
+	{ 0xc00000, 0xc00003, 0, }, // vdp data port
+	{ 0xc00004, 0xc00007, 0, }, // vdp control
+	{ 0xc00009, 0xc0000f, 0, }, // hv counter
+	{ 0xc00010, 0xc00017, 0, }, // PSG
+	{ 0xc00018, 0xc0001f, 0, }, // unused
+	{ 0xc00020, 0xdfffff, 0, }  // vdp mirrors
+};
+
+
+void log_io(unsigned int a, int bits, int is_write)
+{
+	int i;
+	a &= 0x00ffffff;
+	if (bits > 8) a&=~1;
+
+	for (i = 0; i < sizeof(io_locations)/sizeof(io_locations[0]); i++)
+	{
+		if (a >= io_locations[i].addr_min && a <= io_locations[i].addr_max)
+		{
+			switch (bits|(is_write<<8)) {
+				case 0x008: io_locations[i].r8 ++; break;
+				case 0x010: io_locations[i].r16++; break;
+				case 0x020: io_locations[i].r32++; break;
+				case 0x108: io_locations[i].w8 ++; break;
+				case 0x110: io_locations[i].w16++; break;
+				case 0x120: io_locations[i].w32++; break;
+				default:    printf("%06x %i %i\n", a, bits, is_write); break;
+			}
+		}
+	}
+}
+
+void log_io_clear(void)
+{
+	int i;
+	for (i = 0; i < sizeof(io_locations)/sizeof(io_locations[0]); i++)
+	{
+		io_log_location *iol = &io_locations[i];
+		iol->r8 = iol->r16 = iol->r32 = iol->w8 = iol->w16 = iol->w32 = 0;
+	}
+}
+
+void log_io_dump(void)
+{
+	int i;
+	printf("          range :       r8      r16      r32       w8      w16      w32\n");
+	for (i = 0; i < sizeof(io_locations)/sizeof(io_locations[0]); i++)
+	{
+		io_log_location *iol = &io_locations[i];
+		if (iol->r8 == 0 && iol->r16 == 0 && iol->r32 == 0 && iol->w8 == 0 && iol->w16 == 0 && iol->w32 == 0)
+			continue;
+		printf("%06x - %06x : %8i %8i %8i %8i %8i %8i\n", iol->addr_min, iol->addr_max,
+			iol->r8, iol->r16, iol->r32, iol->w8, iol->w16, iol->w32);
+	}
+	printf("\n");
+}
+