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diff --git a/tex/context/modules/mkiv/m-barcodes.mkiv b/tex/context/modules/mkiv/m-barcodes.mkiv
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+%D \module
+%D   [       file=m-barcodes,
+%D        version=2010.03.14,
+%D          title=\CONTEXT\ Extra Modules,
+%D       subtitle=Barcodes,
+%D         author=Hans Hagen,
+%D           date=\currentdate,
+%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
+%C
+%C This module is part of the \CONTEXT\ macro||package and is
+%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
+%C details.
+
+\writestatus{barcodes}{the 'zint' module is a better choice}
+
+% \startTEXpage
+%     \startPSTRICKS
+%         \pspicture(-4mm,-1mm)(38mm,26mm)
+%             \psbarcode{9781860742712}{includetext guardwhitespace}{ean13}%
+%         \endpspicture
+%     \stopPSTRICKS
+% \stopTEXpage
+
+% 978-94-90688-01-1
+%
+%   978 = ean isbn identifier (979 also)
+%    94 = country code
+% 90688 = publisher code
+%    01 = title 1
+%     1 = checksum
+
+\usemodule[pstricks]
+
+\usePSTRICKSmodule[pst-barcode]
+
+\definefont[barcodefont][file:ocrb10]
+% \definefont[barcodefont][file:texgyreheros-regular]
+
+\startluacode
+moduledata.barcodes = { }
+
+local function split(code)
+    local t = { string.byte(code,1,#code) }
+    if #t >= 12 then
+        local s = 0
+        for i=1,11,2 do
+            s = s + (t[i]-48)
+        end
+        for i=2,12,2 do
+            s = s + 3 * (t[i]-48)
+        end
+        local m = s % 10
+        local c = (m > 0 and (10 - m)) or 0
+        return t, s, m, c
+    end
+end
+
+function moduledata.barcodes.isbn_1(original)
+    local code = string.gsub(original,"%-","")
+    local t, s, m, c = split(code)
+    if t then
+        if #t == 13 then
+            local e = ((c == t[13] - 48) and "correct") or "wrong"
+            logs.report("isbn code","code=%s, sum=%s, checksum=%s, modulo=%s, status=%s",original,s,m,c,e)
+        else
+            logs.report("isbn code","code=%s, sum=%s, checksum=%s, modulo=%s",original,s,m,c)
+            code= code .. c
+        end
+    end
+    context(code)
+end
+
+function moduledata.barcodes.isbn_2(original)
+    local code = string.gsub(original,"%-","")
+    local t, s, m, c = split(code)
+    if t and #t == 12 then
+        original = original .. "-" .. c
+    end
+    context(original)
+end
+\stopluacode
+
+\startsetups barcode:isbn
+    \scale
+        [width=5cm]
+        {
+            \vbox {
+                \hbox {
+                    \hskip3.7mm
+                    \scale[width=34mm]{\barcodefont ISBN \ctxlua{moduledata.barcodes.isbn_2("\getvariable{barcode}{code}")}}
+                }
+                \par
+                \normalexpanded { \noexpand \setPSTRICKS {
+                    \noexpand \pspicture(-4mm,-1mm)(38mm,26mm)
+                        \noexpand \psbarcode {
+                            \ctxlua{moduledata.barcodes.isbn_1("\getvariable{barcode}{code}")}
+                        } {
+                            includetext guardwhitespace
+                        } {
+                            ean13
+                        }
+                    \noexpand \endpspicture
+                }
+                \noexpand \processPSTRICKS }
+            }
+        }
+\stopsetups
+
+\unexpanded\def\barcode[#1]%
+  {\bgroup
+   \setvariables[barcode][type=isbn,#1]%
+   \directsetup{barcode:\getvariable{barcode}{type}}%
+   \egroup}
+
+\continueifinputfile{m-barcodes.mkiv}
+
+\starttext
+    \startTEXpage
+        \barcode[type=isbn,code=978-94-90688-01-1]
+    \stopTEXpage
+\stoptext
+