diff --git a/programs/develop/tinypy/modules/kolibri/fs.c b/programs/develop/tinypy/modules/kolibri/fs.c
new file mode 100755
index 0000000000..ce94be5007
--- /dev/null
+++ b/programs/develop/tinypy/modules/kolibri/fs.c
@@ -0,0 +1,258 @@
+#include <string.h>
+#include "tp.h"
+
+extern tp_obj tp_fnc(TP,tp_obj v(TP));
+extern tp_obj tp_method(TP,tp_obj self,tp_obj v(TP));
+extern tp_obj tp_number(tp_num v);
+extern tp_obj tp_string(char const *v);
+extern tp_obj tp_list(TP);
+extern tp_obj tp_dict(TP);
+extern void _tp_raise(TP,tp_obj);
+#define _cdecl __attribute__((cdecl))
+extern int (* _cdecl con_printf)(const char* format,...);
+
+#define call70(par, st) asm volatile ("int   $0x40":"=a"(st):"a"(70), "b"(par))
+#define call70_rw(par, st, cnt) asm volatile ("int   $0x40":"=a"(st), "=b"(cnt):"a"(70), "b"(par))
+typedef unsigned int uint32_t;
+typedef unsigned char uint8_t;
+
+typedef struct {
+        uint32_t subfnc;
+        uint32_t res1;
+        uint32_t res2;
+        uint32_t res3;
+        uint8_t *data;
+        uint8_t  res4;
+        char    *fn;
+    }__attribute__((__packed__))  info_params_t;
+
+typedef struct {
+        uint32_t subfnc;
+        uint32_t pos;
+        uint32_t res1;
+        uint32_t cnt;
+        char*    data;
+        uint8_t res2;
+        char*    fn;
+    } __attribute__((__packed__)) rw_params_t;
+
+static tp_obj kolibri_close(TP)
+{
+    tp_obj self = TP_TYPE(TP_DICT);
+    uint32_t size = tp_get(tp, self, tp_string("size")).number.val;
+    char *mode = (char *)tp_get(tp, self, tp_string("mode")).string.val;
+    tp_set(tp, self, tp_string("closed"), tp_True);
+    return tp_None;
+}
+
+static tp_obj kolibri_read(TP)
+{
+    uint32_t status, num;
+    tp_obj self = TP_TYPE(TP_DICT);
+    uint32_t pos = tp_get(tp, self, tp_string("pos")).number.val;
+    uint32_t size = tp_get(tp, self, tp_string("size")).number.val;
+    uint32_t cnt;
+    char *buf = (char *)malloc(size - pos);
+    rw_params_t params = {0, pos, 0, size - pos, buf, 0,
+                (char *)tp_get(tp, self, tp_string("name")).string.val};
+    char *mode = (char *)tp_get(tp, self, tp_string("mode")).string.val;
+
+    if (*mode != 'r')
+        tp_raise(tp_None, "IOError: file not open for reading", tp_None);
+
+    if (!buf)
+        return tp_None;
+    call70_rw((&params), status, cnt);
+    buf[cnt] = '\0';
+    return tp_string(buf);
+}
+
+#if 0
+static tp_obj kolibri_readline(TP)
+{
+    return tp_string("Line");
+}
+
+static tp_obj kolibri_readlines(TP)
+{
+    tp_obj result = tp_list(tp);
+    int i;
+
+    for(i=0; i < 5; i++)
+        tp_add(result, tp_string("Line"));
+    return result;
+}
+#endif
+
+/* Write object to file.
+ *
+ * tp   TinyPy virtual machine structure.
+ *
+ * returns tp_True
+ */
+static tp_obj kolibri_write(TP)
+{
+    tp_obj self = TP_TYPE(TP_DICT);
+    tp_obj obj = TP_OBJ(); /* What to write. */
+    char *mode = (char *)tp_get(tp, self, tp_string("mode")).string.val;
+    uint32_t pos = (uint32_t)tp_get(tp, self, tp_string("pos")).number.val;
+    uint32_t size = (uint32_t)tp_get(tp, self, tp_string("size")).number.val;
+
+    if (*mode != 'w' && *mode != 'a')
+    {
+        tp_raise(tp_None, "IOError: file not open for writing", tp_None);
+    }
+    else
+    {
+        char *data = (char *)TP_CSTR(obj);
+        rw_params_t params = {3, pos, 0, strlen(data), data, 0,
+                             (char *)tp_get(tp, self, tp_string("name")).string.val};
+        uint32_t status;
+        uint32_t cnt;
+        call70_rw((&params), status, cnt);
+        if (status)
+        {
+            tp_raise(tp_None, "IOError: writing failed with status %d", status);
+        }
+        pos += cnt;
+        tp_set(tp, self, tp_string("pos"), tp_number(pos));
+        if (pos > size)
+        {
+            /* If writing has come beyond the file, increase its size. */
+            tp_set(tp, self, tp_string("size"), tp_number(pos));
+        }
+        return tp_True;
+    }
+}
+
+/* Write line list into file.
+ *
+ * tp   TinyPy virtual machine structure.
+ *
+ * returns tp_None.
+ */
+static tp_obj kolibri_writelines(TP)
+{
+    tp_obj result = tp_None;
+    tp_obj self = TP_TYPE(TP_DICT);
+    tp_obj list = TP_TYPE(TP_LIST); /* What to write. */
+    char *mode = (char *)tp_get(tp, self, tp_string("mode")).string.val;
+    long pos = (long)tp_get(tp, self, tp_string("pos")).number.val;
+    uint32_t size = (uint32_t)tp_get(tp, self, tp_string("size")).number.val;
+
+    if (*mode != 'w' && *mode != 'a')
+    {
+        tp_raise(tp_None, "IOError: file not open for writing", tp_None);
+    }
+    else
+    {
+        int i;
+        char *fn = (char *)tp_get(tp, self, tp_string("name")).string.val;
+        rw_params_t params = {3, 0, 0, 0, NULL, 0, fn};
+
+        for (i = 0; i < list.list.val->len; i++)
+        {
+            char *data = (char *)TP_CSTR(list.list.val->items[i]);
+            uint32_t status;
+            uint32_t cnt;
+
+            params.data = data;
+            params.cnt = strlen(data);
+            params.pos = pos;
+
+            call70_rw((&params), status, cnt);
+            if (status)
+                tp_raise(tp_None, "IOError: writing failed with status %d", status);
+            pos += cnt;
+        }
+        tp_set(tp, self, tp_string("pos"), tp_number(pos));
+        if (pos > size)
+        {
+            /* If writing has come beyond the file, increase its size. */
+            tp_set(tp, self, tp_string("size"), tp_number(pos));
+        }
+        return tp_True;
+    }
+}
+
+/* Get file size.
+ *
+ * fn   ASCIIZ absolute file path.
+ */
+long long int kolibri_filesize(const char *fn)
+{
+    uint8_t data[40];
+    uint32_t status;
+    long long int result;
+    info_params_t params = {5, 0, 0, 0, data, 0, (char *)fn};
+
+    call70((&params), status);
+    /* File size is at offset 32. */
+    if (status == 0)
+        result = *(long long*)(&data[32]);
+    else
+        result = -status;
+    return result;
+}
+
+
+/* Open file.
+ *
+ * tp   TinyPy virtual machine structure.
+ *
+ * returns file object.
+ */
+tp_obj kolibri_open(TP) {
+    tp_obj obj;
+    char *fn = (char *)(TP_TYPE(TP_STRING).string.val);
+    tp_obj mode_obj = TP_OBJ();
+    long long int size;
+    long long int pos = 0;
+    uint32_t status;
+    info_params_t params = {2, 0, 0, 0, NULL, 0, fn};
+
+    if (mode_obj.type == TP_NONE)
+        mode_obj = tp_string("r");
+    else if (mode_obj.type != TP_STRING)
+        tp_raise(tp_None, "ValueError: bad file access mode %s", TP_CSTR(mode_obj));
+    switch(mode_obj.string.val[0])
+    {
+        case 'w':
+            call70((&params), status);
+            if (status)
+                tp_raise(tp_None, "IOError: cannot open file for writing", tp_None);
+            size = 0;
+            break;
+        case 'a':
+            pos = size;
+            break;
+        case 'r':
+            break;
+        default:
+            tp_raise(tp_None, "ValueError: mode string must begin with 'r', 'w', or 'a'", tp_None);
+    }
+    if ((size = kolibri_filesize(fn)) < 0)
+        tp_raise(tp_None, "IOError: filesize returned %d", tp_number(size));
+    obj = tp_dict(tp);
+    tp_set(tp, obj, tp_string("name"), tp_string(fn));
+    tp_set(tp, obj, tp_string("size"), tp_number(size));
+    tp_set(tp, obj, tp_string("pos"), tp_number(pos));
+    tp_set(tp, obj, tp_string("mode"), mode_obj);
+#if 0
+    tp_set(tp, obj, tp_string("__doc__"),
+           tp_string("File object.\nAttributes:\n  name: file name\n"
+                     "  closed: boolean indicating whether file was closed\n"
+                     "Methods:\n  read: read the entire file into string\n"
+                     "  readlines: get list of lines\n"
+                     "  close: close the file\n"
+                     ));
+#endif
+    tp_set(tp, obj, tp_string("closed"), tp_False);
+    tp_set(tp, obj, tp_string("close"), tp_method(tp, obj, kolibri_close));
+    tp_set(tp, obj, tp_string("read"), tp_method(tp, obj, kolibri_read));
+    tp_set(tp, obj, tp_string("write"), tp_method(tp, obj, kolibri_write));
+    tp_set(tp, obj, tp_string("writelines"), tp_method(tp, obj, kolibri_writelines));
+    return obj;
+}
+
+
diff --git a/programs/develop/tinypy/modules/kolibri/init.c b/programs/develop/tinypy/modules/kolibri/init.c
new file mode 100755
index 0000000000..6486e84a42
--- /dev/null
+++ b/programs/develop/tinypy/modules/kolibri/init.c
@@ -0,0 +1,20 @@
+#include "tp.h"
+
+extern tp_obj kolibri_open(TP);
+extern tp_obj tp_dict(TP);
+extern tp_obj tp_fnc(TP,tp_obj v(TP));
+
+void kolibri_init(TP)
+{
+    tp_obj kolibri_mod = tp_dict(tp);
+
+    tp_set(tp, kolibri_mod, tp_string("open"), tp_fnc(tp, kolibri_open));
+
+    /* Bind module attributes. */
+    tp_set(tp, kolibri_mod, tp_string("__doc__"),
+        tp_string("KolibriOS system specific functions."));
+    tp_set(tp, kolibri_mod, tp_string("__name__"), tp_string("kolibri"));
+    tp_set(tp, kolibri_mod, tp_string("__file__"), tp_string(__FILE__));
+    /* Bind to tiny modules[] */
+    tp_set(tp, tp->modules, tp_string("kolibri"), kolibri_mod);
+}
diff --git a/programs/develop/tinypy/tinypy/test.py b/programs/develop/tinypy/tinypy/test.py
index b67491643b..e48a998697 100644
--- a/programs/develop/tinypy/tinypy/test.py
+++ b/programs/develop/tinypy/tinypy/test.py
@@ -1,7 +1,12 @@
 import kolibri
 if __name__=="__main__":
   print("ok!")
-  f = kolibri.open("/hd0/1/tinypy/test.txt")
-  print(f.size)
-  print(f.read())
+  f = kolibri.open("/hd0/1/tinypy/test.txt", "a")
+  l=[]
+  s=""
+  for i in range(10):
+      s = s + 'A'
+      l.append(s+'\n')
+  print(l)
+  f.writelines(l)
   f.close()