Added chipset information.

unsupported/hp-scanjet-4570c.html

@@ -31,8 +31,73 @@
       0x1305
     </p>
     <h2>Chipset</h2>
-    <p>
-    </p>
+    <pre>
+These are the chips on the board:
+
+U1
+ AH50
+ 169F8
+                                                                                
+ Pinout: 3 pins
+                                                                                
+U2,U3,U14
+ ATC
+ AP34063
+ 0241A
+                                                                                
+ DC/DC Converter
+ http://www.anachip.com/downloads/datasheets/power/sw_reg/AP34063.pdf
+                                                                                
+U4
+ WM8199CDS
+ 28AC3TX
+                                                                                
+ 16-bit analogue front end/digitiser
+ http://www.wolfsonmicro.com/products/digital_imaging/WM8199/
+                                                                                
+U6
+ 26-00188-00B
+ 0240MF79K-01
+                                                                                
+ Pinout: 4x52 = 208
+                                                                                
+U7
+ A3967SLB
+ A 0243
+ M243967APA
+                                                                                
+ Step motor driver
+ http://www.allegromicro.com/sf/3967/
+                                                                                
+U8
+ Winbond
+ 241WH
+ W981616BH-7
+                                                                                
+ 16Mbit SDRAM
+ http://www.winbond.com/e-winbondhtm/partner/PDFresult.asp?Pname=241
+                                                                                
+U9
+ Ver 026
+ CheckSum:
+ 9D29
+                                                                                
+ EPROM?
+ Pinout: 4x9
+                                                                                
+U10
+ 26-00053-02A
+ 0227MFASH-33
+                                                                                
+ Pinout: 4x12
+                                                                                
+U12
+ 24LC08B
+ SN0212
+                                                                                
+ 8K I2C Serial EE
+ http://www.microchip.com/download/lit/pline/memory/ic/21710a.pdf
+    </pre>
     <h2>Comments</h2>
     <p>
       Portrait scanner with TA, similar to <a