diff --git a/scheme/ikarus.not-yet-implemented.ss b/scheme/ikarus.not-yet-implemented.ss
index 5ffe6e8..ad4fd4e 100644
--- a/scheme/ikarus.not-yet-implemented.ss
+++ b/scheme/ikarus.not-yet-implemented.ss
@@ -4,7 +4,7 @@
     angle make-polar 
     bitwise-copy-bit-field bitwise-reverse-bit-field
     bitwise-rotate-bit-field bitwise-if fxreverse-bit-field
-    fxrotate-bit-field bytevector->string string->bytevector
+    fxrotate-bit-field 
     make-custom-binary-input/output-port
     make-custom-textual-input/output-port
     open-file-input/output-port output-port-buffer-mode
@@ -20,7 +20,7 @@
     angle make-polar 
     bitwise-copy-bit-field bitwise-reverse-bit-field
     bitwise-rotate-bit-field bitwise-if fxreverse-bit-field
-    fxrotate-bit-field bytevector->string string->bytevector
+    fxrotate-bit-field 
     make-custom-binary-input/output-port
     make-custom-textual-input/output-port
     open-file-input/output-port output-port-buffer-mode
@@ -56,7 +56,6 @@
 
   (not-yet 
     ;;; should be implemented
-    bytevector->string string->bytevector
     string-downcase string-titlecase string-upcase
     angle make-polar 
     bitwise-if
diff --git a/scheme/ikarus.unicode-conversion.ss b/scheme/ikarus.unicode-conversion.ss
index 0d0f9cf..162481f 100644
--- a/scheme/ikarus.unicode-conversion.ss
+++ b/scheme/ikarus.unicode-conversion.ss
@@ -16,9 +16,11 @@
 
 (library (ikarus transcoders)
   (export string->utf8 utf8->string string->utf16 string->utf32
-          utf16->string utf32->string)
+          utf16->string utf32->string string->bytevector
+          bytevector->string)
   (import (except (ikarus) string->utf8 utf8->string string->utf16
-                  utf16->string string->utf32 utf32->string)
+                  utf16->string string->utf32 utf32->string
+                  string->bytevector bytevector->string)
           (ikarus system $strings)
           (ikarus system $bytevectors)
           (ikarus system $fx)
@@ -584,4 +586,26 @@
         [(bv endianness em?)
          ($utf32->string bv endianness em?)])))
 
-  )
+
+  (define (bytevector->string bv t)
+    (define who 'bytevector->string)
+    (unless (bytevector? bv)
+      (die who "not a bytevector" bv))
+    (unless (transcoder? t)
+      (die who "not a transcoder" t))
+    (call-with-port (open-bytevector-input-port bv t)
+      (lambda (tcip)
+        (let ([r (get-string-all tcip)])
+          (if (eof-object? r) "" r)))))
+
+  (define (string->bytevector str t)
+    (define who 'string->bytevector)
+    (unless (string? str)
+      (die who "not a string" str))
+    (unless (transcoder? t)
+      (die who "not a transcoder" t))
+    (call-with-bytevector-output-port
+      (lambda (tcop)
+        (put-string tcop str))
+      t))
+)
diff --git a/scheme/last-revision b/scheme/last-revision
index e8c1952..45ff3ac 100644
--- a/scheme/last-revision
+++ b/scheme/last-revision
@@ -1 +1 @@
-1530
+1531