Added some more details.

unsupported/hp-scanjet-4570c.html

@@ -107,6 +107,12 @@ U12
       href="hp-scanjet-4500c.html">4500C</a>. Same as 5550C, but without
       ADF. The manual says: 4500c and 5500c series.
     </p>
+    <p>
+      "According to manual similar to 4500c and 5500c series scanners. It comes
+      with a transparent materials adaptor (TMA). [...] The TMA is an external
+      device which can be unplugged.  Windows XP refers to it as HP ScanJet
+      4570c/5500c Windows uses usbscn.sys hpgtbb.dll hpgwiand.dll hpsjvset.dll."
+    </p>
     <h2>Output of /proc/bus/usb/devices or sane-find-scanner -v -v</h2>
     <pre>
 T:  Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  2 Spd=12  MxCh= 0
@@ -183,6 +189,27 @@ bNumConfigurations    1
     bRefresh          0
     bSynchAddress     0
 found USB scanner (vendor=0x03f0 [Hewlett-Packard], product=0x1305 [hp scanjet scanner]) at libusb:001:002
+
+&lt;trying to find out which USB chip is used&gt;
+    checking for GT-6801 ...
+    this is not a GT-6801 (bcdUSB = 0x200)
+    checking for GT-6816 ...
+    this is not a GT-6816 (bDeviceClass = 255, bInterfaceClass = 255)
+    checking for MA-1017 ...
+    this is not a MA-1017 (bDeviceClass = 255, bInterfaceClass = 255)
+    checking for MA-1015 ...
+    this is not a MA-1015 (bcdUSB = 0x200)
+    checking for MA-1509 ...
+    this is not a MA-1509 (bcdUSB = 0x200)
+    checking for LM983[1,2,3] ...
+    this is not a LM983x (bcdUSB = 0x200)
+    checking for GL646 ...
+    this is not a GL646 (bDeviceClass = 255, bInterfaceClass = 255)
+    checking for GL660+GL646 ...
+    this is not a GL660+GL646 (bDeviceClass = 255, bInterfaceClass = 255)
+&lt;Couldn't determine the type of the USB chip&gt;
+
+
     </pre>
     
     <h1>Want to add or correct information?</h1>