diff --git a/scheme/ikarus.io.ss b/scheme/ikarus.io.ss
index 96ceee8..f86d3e3 100644
--- a/scheme/ikarus.io.ss
+++ b/scheme/ikarus.io.ss
@@ -39,7 +39,7 @@
     port-position port-has-port-position? 
     set-port-position! port-has-set-port-position!? 
     call-with-port
-    flush-output-port
+    flush-output-port 
     put-u8 put-bytevector
     put-char write-char
     put-string
@@ -58,6 +58,7 @@
     console-input-port
     newline
     port-mode set-port-mode!
+    output-port-buffer-mode
     reset-input-port!
     reset-output-port!
     port-id
@@ -117,6 +118,7 @@
       console-error-port
       newline
       port-mode set-port-mode!
+      output-port-buffer-mode
       reset-input-port!
       reset-output-port!
       port-id
@@ -1587,6 +1589,16 @@
            (open-output-file-handle filename file-options who)
            filename buffer-size transcoder #t who))]))
 
+  (define (output-port-buffer-mode p)
+    (unless (output-port? p)
+      (die 'output-port-buffer-mode "not an output port" p))
+    (let ([buff ($port-buffer p)])
+      (if (if (string? buff) 
+              (fx= 1 (string-length buff))
+              (fx= 1 (bytevector-length buff)))
+          'none
+          'block)))
+
   (define (open-output-file filename)
     (unless (string? filename)
       (die 'open-output-file "invalid filename" filename))
diff --git a/scheme/ikarus.not-yet-implemented.ss b/scheme/ikarus.not-yet-implemented.ss
index 446b425..7b093f1 100644
--- a/scheme/ikarus.not-yet-implemented.ss
+++ b/scheme/ikarus.not-yet-implemented.ss
@@ -5,7 +5,7 @@
     bitwise-rotate-bit-field fxreverse-bit-field
     make-custom-binary-input/output-port
     make-custom-textual-input/output-port
-    open-file-input/output-port output-port-buffer-mode
+    open-file-input/output-port 
     equal-hash)
 
   (import (except (ikarus) 
@@ -13,7 +13,7 @@
     bitwise-rotate-bit-field fxreverse-bit-field
     make-custom-binary-input/output-port
     make-custom-textual-input/output-port
-    open-file-input/output-port output-port-buffer-mode
+    open-file-input/output-port 
     equal-hash))
   
   (define-syntax not-yet
@@ -29,11 +29,11 @@
              (condition 
                (make-error)
                (make-who-condition 'ikarus)
-               (make-message-condition "primitive not supported yet")
+               (make-message-condition "primitive not supported")
                (make-message-condition
-                 "please file a bug report to help us prioritize our goals")
+                 "Please visit the Ikarus FAQs page for more information")
                (make-url-condition 
-                 "https://bugs.launchpad.net/ikarus/+filebug")
+                 "https://answers.launchpad.net/ikarus/+faqs")
                (make-irritants-condition (list op)))))
          (define (x* . args) (bug 'x*))
          ...)]))
@@ -48,7 +48,6 @@
     make-custom-binary-input/output-port
     make-custom-textual-input/output-port
     open-file-input/output-port
-    output-port-buffer-mode
     ))
 
 
diff --git a/scheme/last-revision b/scheme/last-revision
index 36dd03b..f344618 100644
--- a/scheme/last-revision
+++ b/scheme/last-revision
@@ -1 +1 @@
-1710
+1711