diff --git a/Makefile b/Makefile
index 0de944f..d8119fc 100644
--- a/Makefile
+++ b/Makefile
@@ -4,6 +4,7 @@ CFLAGS=-Ilib83 -c -mz80 --std-sdcc2x --no-std-crt0 --reserve-regs-iy --opt-code-
 
 OBJS=_crt0.rel clrscr.rel putchar.rel puts.rel exit.rel gotoxy.rel __assert_fail.rel \
      getchar.rel put_int.rel ctype.rel memcpy.rel memset.rel memmove.rel memcmp.rel \
+	 strcpy.rel \
 	 main.rel
 
 .PHONY: all clean try
diff --git a/lib83/memcpy.c b/lib83/memcpy.c
index cc615f6..d6fbbfa 100644
--- a/lib83/memcpy.c
+++ b/lib83/memcpy.c
@@ -2,8 +2,8 @@
 #include <string.h>
 
 void * memcpy(void * dest, const void * src, size_t n) {
-    char * d = dest;
-    const char * s = src;
+    register char * d = dest;
+    register const char * s = src;
     while (n--) *d++ = *s++;
     return dest;
 }
diff --git a/lib83/memmove.c b/lib83/memmove.c
index 1299fd9..dfa867b 100644
--- a/lib83/memmove.c
+++ b/lib83/memmove.c
@@ -2,11 +2,11 @@
 #include <string.h>
 
 void * memmove(void * dst, void * src, size_t acount) {
-    void * ret = dst;
-    char * d;
-    char * s;
+    register void * ret = dst;
+    register char * d;
+    register char * s;
 
-    if (((int)src < (int)dst) && ((((int)src) + acount) > (int)dst)) {
+    if (src < dst && (char *)src + acount > dst) {
         d = ((char *)dst) + acount - 1;
         s = ((char *)src) + acount - 1;
         while (acount--) {
diff --git a/lib83/strcpy.c b/lib83/strcpy.c
new file mode 100644
index 0000000..0f1a8f9
--- /dev/null
+++ b/lib83/strcpy.c
@@ -0,0 +1,9 @@
+
+#include <string.h>
+
+char * strcpy (char * d, const char * from)  {
+    register char * to = d;
+    while (*to++ = *from++);
+    return d;
+}
+
diff --git a/lib83/string.h b/lib83/string.h
index a039288..c33d86b 100644
--- a/lib83/string.h
+++ b/lib83/string.h
@@ -14,6 +14,7 @@ extern char *strncpy(char *dest, const char *src, size_t n);
 extern size_t strlen(const char *s);
 extern int8_t strcmp(const char *s1, const char *s2);
 extern int8_t strncmp(const char *s1, const char *s2, size_t n);
+extern char * strcat(char *dest, const char *src);
 
 #endif